[BAEL-16003] Moving article out of libraries (& flink from libraries-data) into libraries-data-2

libraries-data-2/README.md

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+### Relevant articles
+- [Introduction to Apache Flink with Java](http://www.baeldung.com/apache-flink)
+- [Guide to the HyperLogLog Algorithm](http://www.baeldung.com/java-hyperloglog)
+- [Introduction to Conflict-Free Replicated Data Types](http://www.baeldung.com/java-conflict-free-replicated-data-types)
+- [Introduction to javax.measure](http://www.baeldung.com/javax-measure)
+- [Introduction To Docx4J](http://www.baeldung.com/docx4j)
+- [Interact with Google Sheets from Java](http://www.baeldung.com/google-sheets-java-client)
+- [Introduction To OpenCSV](http://www.baeldung.com/opencsv)
+- [Introduction to Smooks](http://www.baeldung.com/smooks)
+- [A Guide to Infinispan in Java](http://www.baeldung.com/infinispan)
+

libraries-data-2/log4j.properties

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+log4j.rootLogger=INFO, stdout

libraries-data-2/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>libraries-http</artifactId>
+    <name>libraries-http</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-connector-kafka-0.11_2.11</artifactId>
+            <version>${flink.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-streaming-java_2.11</artifactId>
+            <version>${flink.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-core</artifactId>
+            <version>${flink.version}</version>
+            <exclusions>
+                <exclusion>
+                    <artifactId>commons-logging</artifactId>
+                    <groupId>commons-logging</groupId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-java</artifactId>
+            <version>${flink.version}</version>
+            <exclusions>
+                <exclusion>
+                    <artifactId>commons-logging</artifactId>
+                    <groupId>commons-logging</groupId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-test-utils_2.11</artifactId>
+            <version>${flink.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>net.agkn</groupId>
+            <artifactId>hll</artifactId>
+            <version>${hll.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.netopyr.wurmloch</groupId>
+            <artifactId>wurmloch-crdt</artifactId>
+            <version>${crdt.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>tec.units</groupId>
+            <artifactId>unit-ri</artifactId>
+            <version>${unit-ri.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.xml.bind</groupId>
+            <artifactId>jaxb-api</artifactId>
+            <version>${jaxb-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.docx4j</groupId>
+            <artifactId>docx4j</artifactId>
+            <version>${docx4j.version}</version>
+        </dependency>
+        <!-- google api -->
+        <dependency>
+            <groupId>com.google.api-client</groupId>
+            <artifactId>google-api-client</artifactId>
+            <version>${google-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.oauth-client</groupId>
+            <artifactId>google-oauth-client-jetty</artifactId>
+            <version>${google-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.apis</groupId>
+            <artifactId>google-api-services-sheets</artifactId>
+            <version>${google-sheets.version}</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/com.opencsv/opencsv -->
+        <dependency>
+            <groupId>com.opencsv</groupId>
+            <artifactId>opencsv</artifactId>
+            <version>${opencsv.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.milyn</groupId>
+            <artifactId>milyn-smooks-all</artifactId>
+            <version>${smooks.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.infinispan</groupId>
+            <artifactId>infinispan-core</artifactId>
+            <version>${infinispan.version}</version>
+        </dependency>
+
+    </dependencies>
+
+    <properties>
+        <flink.version>1.5.0</flink.version>
+        <hll.version>1.6.0</hll.version>
+        <crdt.version>0.1.0</crdt.version>
+        <unit-ri.version>1.0.3</unit-ri.version>
+        <docx4j.version>3.3.5</docx4j.version>
+        <jaxb-api.version>2.1</jaxb-api.version>
+        <google-api.version>1.23.0</google-api.version>
+        <opencsv.version>4.1</opencsv.version>
+        <smooks.version>1.7.0</smooks.version>
+        <infinispan.version>9.1.5.Final</infinispan.version>
+        <google-sheets.version>v4-rev493-1.21.0</google-sheets.version>
+    </properties>
+</project>

libraries-data-2/src/main/com/baeldung/docx/Docx4jExample.java

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+package com.baeldung.docx;
+
+import org.docx4j.dml.wordprocessingDrawing.Inline;
+import org.docx4j.jaxb.Context;
+import org.docx4j.model.table.TblFactory;
+import org.docx4j.openpackaging.exceptions.Docx4JException;
+import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
+import org.docx4j.openpackaging.parts.WordprocessingML.BinaryPartAbstractImage;
+import org.docx4j.openpackaging.parts.WordprocessingML.MainDocumentPart;
+import org.docx4j.wml.BooleanDefaultTrue;
+import org.docx4j.wml.Color;
+import org.docx4j.wml.Drawing;
+import org.docx4j.wml.ObjectFactory;
+import org.docx4j.wml.P;
+import org.docx4j.wml.R;
+import org.docx4j.wml.RPr;
+import org.docx4j.wml.Tbl;
+import org.docx4j.wml.Tc;
+import org.docx4j.wml.Text;
+import org.docx4j.wml.Tr;
+
+import javax.xml.bind.JAXBElement;
+import javax.xml.bind.JAXBException;
+import java.io.File;
+import java.nio.file.Files;
+import java.util.List;
+
+class Docx4jExample {
+
+    void createDocumentPackage(String outputPath, String imagePath) throws Exception {
+        WordprocessingMLPackage wordPackage = WordprocessingMLPackage.createPackage();
+        MainDocumentPart mainDocumentPart = wordPackage.getMainDocumentPart();
+        mainDocumentPart.addStyledParagraphOfText("Title", "Hello World!");
+        mainDocumentPart.addParagraphOfText("Welcome To Baeldung!");
+
+        ObjectFactory factory = Context.getWmlObjectFactory();
+        P p = factory.createP();
+        R r = factory.createR();
+        Text t = factory.createText();
+        t.setValue("Welcome To Baeldung");
+        r.getContent().add(t);
+        p.getContent().add(r);
+        RPr rpr = factory.createRPr();
+        BooleanDefaultTrue b = new BooleanDefaultTrue();
+        rpr.setB(b);
+        rpr.setI(b);
+        rpr.setCaps(b);
+        Color red = factory.createColor();
+        red.setVal("green");
+        rpr.setColor(red);
+        r.setRPr(rpr);
+        mainDocumentPart.getContent().add(p);
+
+        File image = new File(imagePath);
+        byte[] fileContent = Files.readAllBytes(image.toPath());
+        BinaryPartAbstractImage imagePart = BinaryPartAbstractImage.createImagePart(wordPackage, fileContent);
+        Inline inline = imagePart.createImageInline("Baeldung Image", "Alt Text", 1, 2, false);
+        P Imageparagraph = addImageToParagraph(inline);
+        mainDocumentPart.getContent().add(Imageparagraph);
+
+        int writableWidthTwips = wordPackage.getDocumentModel().getSections().get(0).getPageDimensions().getWritableWidthTwips();
+        int columnNumber = 3;
+        Tbl tbl = TblFactory.createTable(3, 3, writableWidthTwips / columnNumber);
+        List<Object> rows = tbl.getContent();
+        for (Object row : rows) {
+            Tr tr = (Tr) row;
+            List<Object> cells = tr.getContent();
+            for (Object cell : cells) {
+                Tc td = (Tc) cell;
+                td.getContent().add(p);
+            }
+        }
+
+        mainDocumentPart.getContent().add(tbl);
+        File exportFile = new File(outputPath);
+        wordPackage.save(exportFile);
+    }
+
+    boolean isTextExist(String testText) throws Docx4JException, JAXBException {
+        File doc = new File("helloWorld.docx");
+        WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.load(doc);
+        MainDocumentPart mainDocumentPart = wordMLPackage.getMainDocumentPart();
+        String textNodesXPath = "//w:t";
+        List<Object> paragraphs = mainDocumentPart.getJAXBNodesViaXPath(textNodesXPath, true);
+        for (Object obj : paragraphs) {
+            Text text = (Text) ((JAXBElement) obj).getValue();
+            String textValue = text.getValue();
+            if (textValue != null && textValue.contains(testText)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static P addImageToParagraph(Inline inline) {
+        ObjectFactory factory = new ObjectFactory();
+        P p = factory.createP();
+        R r = factory.createR();
+        p.getContent().add(r);
+        Drawing drawing = factory.createDrawing();
+        r.getContent().add(drawing);
+        drawing.getAnchorOrInline().add(inline);
+        return p;
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/FlinkDataPipeline.java

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+package com.baeldung.flink;
+
+
+import com.baeldung.flink.model.Backup;
+import com.baeldung.flink.model.InputMessage;
+import com.baeldung.flink.operator.BackupAggregator;
+import com.baeldung.flink.operator.InputMessageTimestampAssigner;
+import com.baeldung.flink.operator.WordsCapitalizer;
+import org.apache.flink.streaming.api.TimeCharacteristic;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.windowing.time.Time;
+import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer011;
+import org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011;
+
+import static com.baeldung.flink.connector.Consumers.*;
+import static com.baeldung.flink.connector.Producers.*;
+
+public class FlinkDataPipeline {
+
+    public static void capitalize() throws Exception {
+        String inputTopic = "flink_input";
+        String outputTopic = "flink_output";
+        String consumerGroup = "baeldung";
+        String address = "localhost:9092";
+
+        StreamExecutionEnvironment environment =
+          StreamExecutionEnvironment.getExecutionEnvironment();
+
+        FlinkKafkaConsumer011<String> flinkKafkaConsumer =
+          createStringConsumerForTopic(inputTopic, address, consumerGroup);
+        flinkKafkaConsumer.setStartFromEarliest();
+
+        DataStream<String> stringInputStream =
+          environment.addSource(flinkKafkaConsumer);
+
+        FlinkKafkaProducer011<String> flinkKafkaProducer =
+        createStringProducer(outputTopic, address);
+
+        stringInputStream
+          .map(new WordsCapitalizer())
+          .addSink(flinkKafkaProducer);
+
+        environment.execute();
+    }
+
+public static void createBackup () throws Exception {
+    String inputTopic = "flink_input";
+    String outputTopic = "flink_output";
+    String consumerGroup = "baeldung";
+    String kafkaAddress = "localhost:9092";
+
+    StreamExecutionEnvironment environment =
+      StreamExecutionEnvironment.getExecutionEnvironment();
+
+    environment.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
+
+    FlinkKafkaConsumer011<InputMessage> flinkKafkaConsumer =
+      createInputMessageConsumer(inputTopic, kafkaAddress, consumerGroup);
+    flinkKafkaConsumer.setStartFromEarliest();
+
+    flinkKafkaConsumer
+      .assignTimestampsAndWatermarks(new InputMessageTimestampAssigner());
+    FlinkKafkaProducer011<Backup> flinkKafkaProducer =
+      createBackupProducer(outputTopic, kafkaAddress);
+
+    DataStream<InputMessage> inputMessagesStream =
+      environment.addSource(flinkKafkaConsumer);
+
+    inputMessagesStream
+      .timeWindowAll(Time.hours(24))
+      .aggregate(new BackupAggregator())
+      .addSink(flinkKafkaProducer);
+
+    environment.execute();
+}
+
+    public static void main(String[] args) throws Exception {
+        createBackup();
+    }
+
+}

libraries-data-2/src/main/com/baeldung/flink/LineSplitter.java

@@ -0,0 +1,18 @@
+package com.baeldung.flink;
+
+import org.apache.flink.api.common.functions.FlatMapFunction;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.util.Collector;
+
+import java.util.stream.Stream;
+
+@SuppressWarnings("serial")
+public class LineSplitter implements FlatMapFunction<String, Tuple2<String, Integer>> {
+
+    @Override
+    public void flatMap(String value, Collector<Tuple2<String, Integer>> out) {
+
+        String[] tokens = value.toLowerCase().split("\\W+");
+        Stream.of(tokens).filter(t -> t.length() > 0).forEach(token -> out.collect(new Tuple2<>(token, 1)));
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/WordCount.java

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+package com.baeldung.flink;
+
+import org.apache.flink.api.java.DataSet;
+import org.apache.flink.api.java.ExecutionEnvironment;
+import org.apache.flink.api.java.aggregation.Aggregations;
+import org.apache.flink.api.java.tuple.Tuple2;
+
+import java.util.List;
+
+public class WordCount {
+
+    public static DataSet<Tuple2<String, Integer>> startWordCount(ExecutionEnvironment env, List<String> lines) throws Exception {
+        DataSet<String> text = env.fromCollection(lines);
+
+        return text.flatMap(new LineSplitter()).groupBy(0).aggregate(Aggregations.SUM, 1);
+
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/connector/Consumers.java

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+package com.baeldung.flink.connector;
+
+import com.baeldung.flink.model.InputMessage;
+import com.baeldung.flink.schema.InputMessageDeserializationSchema;
+import org.apache.flink.api.common.serialization.SimpleStringSchema;
+import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer011;
+
+import java.util.Properties;
+
+public class Consumers {
+
+public static FlinkKafkaConsumer011<String> createStringConsumerForTopic(
+  String topic, String kafkaAddress, String kafkaGroup ) {
+    Properties props = new Properties();
+    props.setProperty("bootstrap.servers", kafkaAddress);
+    props.setProperty("group.id",kafkaGroup);
+    FlinkKafkaConsumer011<String> consumer =
+      new FlinkKafkaConsumer011<>(topic, new SimpleStringSchema(),props);
+
+    return consumer;
+}
+
+    public static FlinkKafkaConsumer011<InputMessage> createInputMessageConsumer(String topic, String kafkaAddress, String kafkaGroup ) {
+        Properties properties = new Properties();
+        properties.setProperty("bootstrap.servers", kafkaAddress);
+        properties.setProperty("group.id",kafkaGroup);
+        FlinkKafkaConsumer011<InputMessage> consumer = new FlinkKafkaConsumer011<InputMessage>(
+                topic, new InputMessageDeserializationSchema(),properties);
+
+        return consumer;
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/connector/Producers.java

@@ -0,0 +1,17 @@
+package com.baeldung.flink.connector;
+
+import com.baeldung.flink.model.Backup;
+import com.baeldung.flink.schema.BackupSerializationSchema;
+import org.apache.flink.api.common.serialization.SimpleStringSchema;
+import org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011;
+
+public class Producers {
+
+    public static FlinkKafkaProducer011<String> createStringProducer(String topic, String kafkaAddress) {
+        return new FlinkKafkaProducer011<>(kafkaAddress, topic, new SimpleStringSchema());
+    }
+
+    public static FlinkKafkaProducer011<Backup> createBackupProducer(String topic, String kafkaAddress) {
+        return new FlinkKafkaProducer011<Backup>(kafkaAddress, topic, new BackupSerializationSchema());
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/model/Backup.java

@@ -0,0 +1,27 @@
+package com.baeldung.flink.model;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.UUID;
+
+public class Backup {
+
+    @JsonProperty("inputMessages")
+    List<InputMessage> inputMessages;
+    @JsonProperty("backupTimestamp")
+    LocalDateTime backupTimestamp;
+    @JsonProperty("uuid")
+    UUID uuid;
+
+    public Backup(List<InputMessage> inputMessages, LocalDateTime backupTimestamp) {
+        this.inputMessages = inputMessages;
+        this.backupTimestamp = backupTimestamp;
+        this.uuid = UUID.randomUUID();
+    }
+
+    public List<InputMessage> getInputMessages() {
+        return inputMessages;
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/model/InputMessage.java

@@ -0,0 +1,71 @@
+package com.baeldung.flink.model;
+
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import com.google.common.base.Objects;
+
+import java.time.LocalDateTime;
+
+@JsonSerialize
+public class InputMessage {
+    String sender;
+    String recipient;
+    LocalDateTime sentAt;
+    String message;
+
+    public InputMessage() {
+    }
+
+    public String getSender() {
+        return sender;
+    }
+    public void setSender(String sender) {
+        this.sender = sender;
+    }
+
+    public String getRecipient() {
+        return recipient;
+    }
+
+    public void setRecipient(String recipient) {
+        this.recipient = recipient;
+    }
+
+    public LocalDateTime getSentAt() {
+        return sentAt;
+    }
+
+    public void setSentAt(LocalDateTime sentAt) {
+        this.sentAt = sentAt;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    public InputMessage(String sender, String recipient, LocalDateTime sentAt, String message) {
+        this.sender = sender;
+        this.recipient = recipient;
+        this.sentAt = sentAt;
+        this.message = message;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        InputMessage message1 = (InputMessage) o;
+        return Objects.equal(sender, message1.sender) &&
+                Objects.equal(recipient, message1.recipient) &&
+                Objects.equal(sentAt, message1.sentAt) &&
+                Objects.equal(message, message1.message);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(sender, recipient, sentAt, message);
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/operator/BackupAggregator.java

@@ -0,0 +1,34 @@
+package com.baeldung.flink.operator;
+
+import com.baeldung.flink.model.Backup;
+import com.baeldung.flink.model.InputMessage;
+import org.apache.flink.api.common.functions.AggregateFunction;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+
+    public class BackupAggregator implements AggregateFunction<InputMessage, List<InputMessage>, Backup> {
+        @Override
+        public List<InputMessage> createAccumulator() {
+            return new ArrayList<>();
+        }
+
+        @Override
+        public List<InputMessage> add(InputMessage inputMessage, List<InputMessage> inputMessages) {
+            inputMessages.add(inputMessage);
+            return inputMessages;
+        }
+
+        @Override
+        public Backup getResult(List<InputMessage> inputMessages) {
+            Backup backup = new Backup(inputMessages, LocalDateTime.now());
+                return backup;
+        }
+
+        @Override
+        public List<InputMessage> merge(List<InputMessage> inputMessages, List<InputMessage> acc1) {
+            inputMessages.addAll(acc1);
+            return inputMessages;
+        }
+    }

libraries-data-2/src/main/com/baeldung/flink/operator/InputMessageTimestampAssigner.java

@@ -0,0 +1,23 @@
+package com.baeldung.flink.operator;
+
+import com.baeldung.flink.model.InputMessage;
+import org.apache.flink.streaming.api.functions.AssignerWithPunctuatedWatermarks;
+import org.apache.flink.streaming.api.watermark.Watermark;
+
+import javax.annotation.Nullable;
+import java.time.ZoneId;
+
+public class InputMessageTimestampAssigner implements AssignerWithPunctuatedWatermarks<InputMessage> {
+
+    @Override
+    public long extractTimestamp(InputMessage element, long previousElementTimestamp) {
+        ZoneId zoneId = ZoneId.systemDefault();
+        return element.getSentAt().atZone(zoneId).toEpochSecond() * 1000;
+    }
+
+    @Nullable
+    @Override
+    public Watermark checkAndGetNextWatermark(InputMessage lastElement, long extractedTimestamp) {
+        return new Watermark(extractedTimestamp - 15);
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/operator/WordsCapitalizer.java

@@ -0,0 +1,11 @@
+package com.baeldung.flink.operator;
+
+import org.apache.flink.api.common.functions.MapFunction;
+
+public class WordsCapitalizer implements MapFunction<String, String> {
+
+    @Override
+    public String map(String s) {
+        return s.toUpperCase();
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/schema/BackupSerializationSchema.java

@@ -0,0 +1,33 @@
+package com.baeldung.flink.schema;
+
+import com.baeldung.flink.model.Backup;
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.PropertyAccessor;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import org.apache.flink.api.common.serialization.SerializationSchema;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class BackupSerializationSchema
+  implements SerializationSchema<Backup> {
+
+    static ObjectMapper objectMapper = new ObjectMapper().registerModule(new JavaTimeModule());
+
+    Logger logger = LoggerFactory.getLogger(BackupSerializationSchema.class);
+
+    @Override
+    public byte[] serialize(Backup backupMessage) {
+        if(objectMapper == null) {
+            objectMapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
+            objectMapper = new ObjectMapper().registerModule(new JavaTimeModule());
+        }
+        try {
+            String json = objectMapper.writeValueAsString(backupMessage);
+            return json.getBytes();
+        } catch (com.fasterxml.jackson.core.JsonProcessingException e) {
+            logger.error("Failed to parse JSON", e);
+        }
+        return new byte[0];
+    }
+}

libraries-data-2/src/main/com/baeldung/flink/schema/InputMessageDeserializationSchema.java

@@ -0,0 +1,32 @@
+package com.baeldung.flink.schema;
+
+import com.baeldung.flink.model.InputMessage;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+
+import java.io.IOException;
+
+public class InputMessageDeserializationSchema implements
+      DeserializationSchema<InputMessage> {
+
+    static ObjectMapper objectMapper = new ObjectMapper().registerModule(new JavaTimeModule());
+
+
+    @Override
+    public InputMessage deserialize(byte[] bytes) throws IOException {
+
+        return objectMapper.readValue(bytes, InputMessage.class);
+    }
+
+    @Override
+    public boolean isEndOfStream(InputMessage inputMessage) {
+        return false;
+    }
+
+    @Override
+    public TypeInformation<InputMessage> getProducedType() {
+        return TypeInformation.of(InputMessage.class);
+    }
+}

libraries-data-2/src/main/com/baeldung/google/sheets/GoogleAuthorizeUtil.java

@@ -0,0 +1,34 @@
+package com.baeldung.google.sheets;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.security.GeneralSecurityException;
+import java.util.Arrays;
+import java.util.List;
+
+import com.google.api.client.auth.oauth2.Credential;
+import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
+import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
+import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
+import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
+import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
+import com.google.api.client.json.jackson2.JacksonFactory;
+import com.google.api.client.util.store.MemoryDataStoreFactory;
+import com.google.api.services.sheets.v4.SheetsScopes;
+
+public class GoogleAuthorizeUtil {
+    public static Credential authorize() throws IOException, GeneralSecurityException {
+        InputStream in = GoogleAuthorizeUtil.class.getResourceAsStream("/google-sheets-client-secret.json");
+        GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JacksonFactory.getDefaultInstance(), new InputStreamReader(in));
+
+        List<String> scopes = Arrays.asList(SheetsScopes.SPREADSHEETS);
+
+        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(GoogleNetHttpTransport.newTrustedTransport(), JacksonFactory.getDefaultInstance(), clientSecrets, scopes).setDataStoreFactory(new MemoryDataStoreFactory())
+                .setAccessType("offline").build();
+        Credential credential = new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");
+
+        return credential;
+    }
+
+}

libraries-data-2/src/main/com/baeldung/google/sheets/SheetsServiceUtil.java

@@ -0,0 +1,20 @@
+package com.baeldung.google.sheets;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+
+import com.google.api.client.auth.oauth2.Credential;
+import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
+import com.google.api.client.json.jackson2.JacksonFactory;
+import com.google.api.services.sheets.v4.Sheets;
+
+public class SheetsServiceUtil {
+
+    private static final String APPLICATION_NAME = "Google Sheets Example";
+
+    public static Sheets getSheetsService() throws IOException, GeneralSecurityException {
+        Credential credential = GoogleAuthorizeUtil.authorize();
+        return new Sheets.Builder(GoogleNetHttpTransport.newTrustedTransport(), JacksonFactory.getDefaultInstance(), credential).setApplicationName(APPLICATION_NAME).build();
+    }
+
+}

libraries-data-2/src/main/com/baeldung/infinispan/CacheConfiguration.java

@@ -0,0 +1,70 @@
+package com.baeldung.infinispan;
+
+import com.baeldung.infinispan.listener.CacheListener;
+import org.infinispan.Cache;
+import org.infinispan.configuration.cache.Configuration;
+import org.infinispan.configuration.cache.ConfigurationBuilder;
+import org.infinispan.eviction.EvictionType;
+import org.infinispan.manager.DefaultCacheManager;
+import org.infinispan.transaction.LockingMode;
+import org.infinispan.transaction.TransactionMode;
+
+import java.util.concurrent.TimeUnit;
+
+public class CacheConfiguration {
+
+    public static final String SIMPLE_HELLO_WORLD_CACHE = "simple-hello-world-cache";
+    public static final String EXPIRING_HELLO_WORLD_CACHE = "expiring-hello-world-cache";
+    public static final String EVICTING_HELLO_WORLD_CACHE = "evicting-hello-world-cache";
+    public static final String PASSIVATING_HELLO_WORLD_CACHE = "passivating-hello-world-cache";
+    public static final String TRANSACTIONAL_CACHE = "transactional-cache";
+
+    public DefaultCacheManager cacheManager() {
+        return new DefaultCacheManager();
+    }
+
+    public Cache<String, Integer> transactionalCache(DefaultCacheManager cacheManager, CacheListener listener) {
+        return this.buildCache(TRANSACTIONAL_CACHE, cacheManager, listener, transactionalConfiguration());
+    }
+
+    public Cache<String, String> simpleHelloWorldCache(DefaultCacheManager cacheManager, CacheListener listener) {
+        return this.buildCache(SIMPLE_HELLO_WORLD_CACHE, cacheManager, listener, new ConfigurationBuilder().build());
+    }
+
+    public Cache<String, String> expiringHelloWorldCache(DefaultCacheManager cacheManager, CacheListener listener) {
+        return this.buildCache(EXPIRING_HELLO_WORLD_CACHE, cacheManager, listener, expiringConfiguration());
+    }
+
+    public Cache<String, String> evictingHelloWorldCache(DefaultCacheManager cacheManager, CacheListener listener) {
+        return this.buildCache(EVICTING_HELLO_WORLD_CACHE, cacheManager, listener, evictingConfiguration());
+    }
+
+    public Cache<String, String> passivatingHelloWorldCache(DefaultCacheManager cacheManager, CacheListener listener) {
+        return this.buildCache(PASSIVATING_HELLO_WORLD_CACHE, cacheManager, listener, passivatingConfiguration());
+    }
+
+    private <K, V> Cache<K, V> buildCache(String cacheName, DefaultCacheManager cacheManager, CacheListener listener, Configuration configuration) {
+
+        cacheManager.defineConfiguration(cacheName, configuration);
+        Cache<K, V> cache = cacheManager.getCache(cacheName);
+        cache.addListener(listener);
+        return cache;
+    }
+
+    private Configuration expiringConfiguration() {
+        return new ConfigurationBuilder().expiration().lifespan(1, TimeUnit.SECONDS).build();
+    }
+
+    private Configuration evictingConfiguration() {
+        return new ConfigurationBuilder().memory().evictionType(EvictionType.COUNT).size(1).build();
+    }
+
+    private Configuration passivatingConfiguration() {
+        return new ConfigurationBuilder().memory().evictionType(EvictionType.COUNT).size(1).persistence().passivation(true).addSingleFileStore().purgeOnStartup(true).location(System.getProperty("java.io.tmpdir")).build();
+    }
+
+    private Configuration transactionalConfiguration() {
+        return new ConfigurationBuilder().transaction().transactionMode(TransactionMode.TRANSACTIONAL).lockingMode(LockingMode.PESSIMISTIC).build();
+    }
+
+}

libraries-data-2/src/main/com/baeldung/infinispan/listener/CacheListener.java

@@ -0,0 +1,53 @@
+package com.baeldung.infinispan.listener;
+
+import org.infinispan.notifications.Listener;
+import org.infinispan.notifications.cachelistener.annotation.*;
+import org.infinispan.notifications.cachelistener.event.*;
+
+@Listener
+public class CacheListener {
+
+    @CacheEntryCreated
+    public void entryCreated(CacheEntryCreatedEvent<String, String> event) {
+        this.printLog("Adding key '" + event.getKey() + "' to cache", event);
+    }
+
+    @CacheEntryExpired
+    public void entryExpired(CacheEntryExpiredEvent<String, String> event) {
+        this.printLog("Expiring key '" + event.getKey() + "' from cache", event);
+    }
+
+    @CacheEntryVisited
+    public void entryVisited(CacheEntryVisitedEvent<String, String> event) {
+        this.printLog("Key '" + event.getKey() + "' was visited", event);
+    }
+
+    @CacheEntryActivated
+    public void entryActivated(CacheEntryActivatedEvent<String, String> event) {
+        this.printLog("Activating key '" + event.getKey() + "' on cache", event);
+    }
+
+    @CacheEntryPassivated
+    public void entryPassivated(CacheEntryPassivatedEvent<String, String> event) {
+        this.printLog("Passivating key '" + event.getKey() + "' from cache", event);
+    }
+
+    @CacheEntryLoaded
+    public void entryLoaded(CacheEntryLoadedEvent<String, String> event) {
+        this.printLog("Loading key '" + event.getKey() + "' to cache", event);
+    }
+
+    @CacheEntriesEvicted
+    public void entriesEvicted(CacheEntriesEvictedEvent<String, String> event) {
+        final StringBuilder builder = new StringBuilder();
+        event.getEntries().forEach((key, value) -> builder.append(key).append(", "));
+        System.out.println("Evicting following entries from cache: " + builder.toString());
+    }
+
+    private void printLog(String log, CacheEntryEvent event) {
+        if (!event.isPre()) {
+            System.out.println(log);
+        }
+    }
+
+}

libraries-data-2/src/main/com/baeldung/infinispan/repository/HelloWorldRepository.java

@@ -0,0 +1,15 @@
+package com.baeldung.infinispan.repository;
+
+public class HelloWorldRepository {
+
+    public String getHelloWorld() {
+        try {
+            System.out.println("Executing some heavy query");
+            Thread.sleep(1000);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        return "Hello World!";
+    }
+
+}

libraries-data-2/src/main/com/baeldung/infinispan/service/HelloWorldService.java

@@ -0,0 +1,77 @@
+package com.baeldung.infinispan.service;
+
+import com.baeldung.infinispan.listener.CacheListener;
+import com.baeldung.infinispan.repository.HelloWorldRepository;
+import org.infinispan.Cache;
+
+import java.util.concurrent.TimeUnit;
+
+public class HelloWorldService {
+
+    private final HelloWorldRepository repository;
+
+    private final Cache<String, String> simpleHelloWorldCache;
+    private final Cache<String, String> expiringHelloWorldCache;
+    private final Cache<String, String> evictingHelloWorldCache;
+    private final Cache<String, String> passivatingHelloWorldCache;
+
+    public HelloWorldService(HelloWorldRepository repository, CacheListener listener, Cache<String, String> simpleHelloWorldCache, Cache<String, String> expiringHelloWorldCache, Cache<String, String> evictingHelloWorldCache,
+            Cache<String, String> passivatingHelloWorldCache) {
+
+        this.repository = repository;
+
+        this.simpleHelloWorldCache = simpleHelloWorldCache;
+        this.expiringHelloWorldCache = expiringHelloWorldCache;
+        this.evictingHelloWorldCache = evictingHelloWorldCache;
+        this.passivatingHelloWorldCache = passivatingHelloWorldCache;
+    }
+
+    public String findSimpleHelloWorld() {
+        String cacheKey = "simple-hello";
+        return simpleHelloWorldCache.computeIfAbsent(cacheKey, k -> repository.getHelloWorld());
+    }
+
+    public String findExpiringHelloWorld() {
+        String cacheKey = "expiring-hello";
+        String helloWorld = simpleHelloWorldCache.get(cacheKey);
+        if (helloWorld == null) {
+            helloWorld = repository.getHelloWorld();
+            simpleHelloWorldCache.put(cacheKey, helloWorld, 1, TimeUnit.SECONDS);
+        }
+        return helloWorld;
+    }
+
+    public String findIdleHelloWorld() {
+        String cacheKey = "idle-hello";
+        String helloWorld = simpleHelloWorldCache.get(cacheKey);
+        if (helloWorld == null) {
+            helloWorld = repository.getHelloWorld();
+            simpleHelloWorldCache.put(cacheKey, helloWorld, -1, TimeUnit.SECONDS, 10, TimeUnit.SECONDS);
+        }
+        return helloWorld;
+    }
+
+    public String findSimpleHelloWorldInExpiringCache() {
+        String cacheKey = "simple-hello";
+        String helloWorld = expiringHelloWorldCache.get(cacheKey);
+        if (helloWorld == null) {
+            helloWorld = repository.getHelloWorld();
+            expiringHelloWorldCache.put(cacheKey, helloWorld);
+        }
+        return helloWorld;
+    }
+
+    public String findEvictingHelloWorld(String key) {
+        String value = evictingHelloWorldCache.get(key);
+        if (value == null) {
+            value = repository.getHelloWorld();
+            evictingHelloWorldCache.put(key, value);
+        }
+        return value;
+    }
+
+    public String findPassivatingHelloWorld(String key) {
+        return passivatingHelloWorldCache.computeIfAbsent(key, k -> repository.getHelloWorld());
+    }
+
+}

libraries-data-2/src/main/com/baeldung/infinispan/service/TransactionalService.java

@@ -0,0 +1,55 @@
+package com.baeldung.infinispan.service;
+
+import org.infinispan.Cache;
+import org.springframework.util.StopWatch;
+
+import javax.transaction.TransactionManager;
+
+public class TransactionalService {
+
+    private final Cache<String, Integer> transactionalCache;
+
+    private static final String KEY = "key";
+
+    public TransactionalService(Cache<String, Integer> transactionalCache) {
+        this.transactionalCache = transactionalCache;
+
+        transactionalCache.put(KEY, 0);
+    }
+
+    public Integer getQuickHowManyVisits() {
+        try {
+            TransactionManager tm = transactionalCache.getAdvancedCache().getTransactionManager();
+            tm.begin();
+            Integer howManyVisits = transactionalCache.get(KEY);
+            howManyVisits++;
+            System.out.println("Ill try to set HowManyVisits to " + howManyVisits);
+            StopWatch watch = new StopWatch();
+            watch.start();
+            transactionalCache.put(KEY, howManyVisits);
+            watch.stop();
+            System.out.println("I was able to set HowManyVisits to " + howManyVisits + " after waiting " + watch.getTotalTimeSeconds() + " seconds");
+
+            tm.commit();
+            return howManyVisits;
+        } catch (Exception e) {
+            e.printStackTrace();
+            return 0;
+        }
+    }
+
+    public void startBackgroundBatch() {
+        try {
+            TransactionManager tm = transactionalCache.getAdvancedCache().getTransactionManager();
+            tm.begin();
+            transactionalCache.put(KEY, 1000);
+            System.out.println("HowManyVisits should now be 1000, " + "but we are holding the transaction");
+            Thread.sleep(1000L);
+            tm.rollback();
+            System.out.println("The slow batch suffered a rollback");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+}

libraries-data-2/src/main/com/baeldung/measurement/WaterTank.java

@@ -0,0 +1,26 @@
+package com.baeldung.measurement;
+
+import javax.measure.Quantity;
+import javax.measure.quantity.Volume;
+
+public class WaterTank {
+
+    private Quantity<Volume> capacityMeasure;
+    private double capacityDouble;
+
+    public void setCapacityMeasure(Quantity<Volume> capacityMeasure) {
+        this.capacityMeasure = capacityMeasure;
+    }
+
+    public void setCapacityDouble(double capacityDouble) {
+        this.capacityDouble = capacityDouble;
+    }
+
+    public Quantity<Volume> getCapacityMeasure() {
+        return capacityMeasure;
+    }
+
+    public double getCapacityDouble() {
+        return capacityDouble;
+    }
+}

libraries-data-2/src/main/com/baeldung/opencsv/Application.java

@@ -0,0 +1,108 @@
+package com.baeldung.opencsv;
+
+import com.baeldung.opencsv.beans.NamedColumnBean;
+import com.baeldung.opencsv.beans.SimplePositionBean;
+import com.baeldung.opencsv.examples.sync.BeanExamples;
+import com.baeldung.opencsv.examples.sync.CsvReaderExamples;
+import com.baeldung.opencsv.examples.sync.CsvWriterExamples;
+import com.baeldung.opencsv.helpers.Helpers;
+
+import java.io.Reader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class Application {
+
+        /*
+         *  Bean Examples.
+         */
+
+    public static String simpleSyncPositionBeanExample() {
+        Path path = null;
+        try {
+            path = Helpers.twoColumnCsvPath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return BeanExamples.beanBuilderExample(path, SimplePositionBean.class).toString();
+    }
+
+    public static String namedSyncColumnBeanExample() {
+        Path path = null;
+        try {
+            path = Helpers.namedColumnCsvPath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return BeanExamples.beanBuilderExample(path, NamedColumnBean.class).toString();
+    }
+
+    public static String writeSyncCsvFromBeanExample() {
+        Path path = null;
+        try {
+            path = Helpers.fileOutBeanPath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return BeanExamples.writeCsvFromBean(path);
+    }
+
+        /*
+         *  CSV Reader Examples.
+         */
+
+    public static String oneByOneSyncExample() {
+        Reader reader = null;
+        try {
+            reader = Files.newBufferedReader(Helpers.twoColumnCsvPath());
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return CsvReaderExamples.oneByOne(reader).toString();
+    }
+
+    public static String readAllSyncExample() {
+        Reader reader = null;
+        try {
+            reader = Files.newBufferedReader(Helpers.twoColumnCsvPath());
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return CsvReaderExamples.readAll(reader).toString();
+    }
+
+         /*
+         *  CSV Writer Examples.
+         */
+
+
+    public static String csvWriterSyncOneByOne() {
+        Path path = null;
+        try {
+            path = Helpers.fileOutOnePath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return CsvWriterExamples.csvWriterOneByOne(Helpers.fourColumnCsvString(), path);
+    }
+
+    public static String csvWriterSyncAll() {
+        Path path = null;
+        try {
+            path = Helpers.fileOutAllPath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return CsvWriterExamples.csvWriterAll(Helpers.fourColumnCsvString(), path);
+    }
+
+    public static void main(String[] args) {
+        simpleSyncPositionBeanExample();
+        namedSyncColumnBeanExample();
+        writeSyncCsvFromBeanExample();
+        oneByOneSyncExample();
+        readAllSyncExample();
+        csvWriterSyncOneByOne();
+        csvWriterSyncAll();
+    }
+}

libraries-data-2/src/main/com/baeldung/opencsv/Constants.java

@@ -0,0 +1,17 @@
+package com.baeldung.opencsv;
+
+public class Constants {
+
+    public static final String GENERIC_EXCEPTION = "EXCEPTION ENCOUNTERED: ";
+    public static final String GENERIC_SUCCESS = "SUCCESS";
+
+    public static final String TWO_COLUMN_CSV = "csv/twoColumn.csv";
+    public static final String FOUR_COLUMN_CSV = "csv/fourColumn.csv";
+    public static final String NAMED_COLUMN_CSV = "csv/namedColumn.csv";
+
+    public static final String CSV_All = "csv/writtenAll.csv";
+    public static final String CSV_BEAN = "csv/writtenBean.csv";
+    public static final String CSV_ONE = "csv/writtenOneByOne.csv";
+
+
+}

libraries-data-2/src/main/com/baeldung/opencsv/beans/CsvBean.java

@@ -0,0 +1,3 @@
+package com.baeldung.opencsv.beans;
+
+public class CsvBean { }

libraries-data-2/src/main/com/baeldung/opencsv/beans/NamedColumnBean.java

@@ -0,0 +1,31 @@
+package com.baeldung.opencsv.beans;
+
+import com.opencsv.bean.CsvBindByName;
+
+public class NamedColumnBean extends CsvBean {
+
+    @CsvBindByName(column = "name")
+    private String name;
+
+    //Automatically infer column name as Age
+    @CsvBindByName
+    private int age;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+
+}

libraries-data-2/src/main/com/baeldung/opencsv/beans/SimplePositionBean.java

@@ -0,0 +1,29 @@
+package com.baeldung.opencsv.beans;
+
+import com.opencsv.bean.CsvBindByPosition;
+
+public class SimplePositionBean extends CsvBean {
+
+    @CsvBindByPosition(position = 0)
+    private String exampleColOne;
+
+    @CsvBindByPosition(position = 1)
+    private String exampleColTwo;
+
+    public String getExampleColOne() {
+        return exampleColOne;
+    }
+
+    private void setExampleColOne(String exampleColOne) {
+        this.exampleColOne = exampleColOne;
+    }
+
+    public String getExampleColTwo() {
+        return exampleColTwo;
+    }
+
+    private void setExampleCsvTwo (String exampleColTwo) {
+        this.exampleColTwo = exampleColTwo;
+    }
+
+}

libraries-data-2/src/main/com/baeldung/opencsv/beans/WriteExampleBean.java

@@ -0,0 +1,40 @@
+package com.baeldung.opencsv.beans;
+
+public class WriteExampleBean extends CsvBean {
+
+    private String colA;
+
+    private String colB;
+
+    private String colC;
+
+    public WriteExampleBean(String colA, String colB, String colC) {
+        this.colA = colA;
+        this.colB = colB;
+        this.colC = colC;
+    }
+
+    public String getColA() {
+        return colA;
+    }
+
+    public void setColA(String colA) {
+        this.colA = colA;
+    }
+
+    public String getColB() {
+        return colB;
+    }
+
+    public void setColB(String colB) {
+        this.colB = colB;
+    }
+
+    public String getColC() {
+        return colC;
+    }
+
+    public void setColC(String colC) {
+        this.colC = colC;
+    }
+}

libraries-data-2/src/main/com/baeldung/opencsv/examples/sync/BeanExamples.java

@@ -0,0 +1,63 @@
+package com.baeldung.opencsv.examples.sync;
+
+import com.baeldung.opencsv.beans.CsvBean;
+import com.baeldung.opencsv.beans.WriteExampleBean;
+import com.baeldung.opencsv.helpers.Helpers;
+import com.baeldung.opencsv.pojos.CsvTransfer;
+import com.opencsv.CSVWriter;
+import com.opencsv.bean.*;
+
+import java.io.FileWriter;
+import java.io.Reader;
+import java.io.Writer;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+public class BeanExamples {
+
+    public static List<CsvBean> beanBuilderExample(Path path, Class clazz) {
+        ColumnPositionMappingStrategy ms = new ColumnPositionMappingStrategy();
+        return beanBuilderExample(path, clazz, ms);
+    }
+
+    public static List<CsvBean> beanBuilderExample(Path path, Class clazz, MappingStrategy ms) {
+        CsvTransfer csvTransfer = new CsvTransfer();
+        try {
+            ms.setType(clazz);
+
+            Reader reader = Files.newBufferedReader(path);
+            CsvToBean cb = new CsvToBeanBuilder(reader).withType(clazz)
+                .withMappingStrategy(ms)
+                .build();
+
+            csvTransfer.setCsvList(cb.parse());
+            reader.close();
+
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return csvTransfer.getCsvList();
+    }
+
+    public static String writeCsvFromBean(Path path) {
+        try {
+            Writer writer = new FileWriter(path.toString());
+
+            StatefulBeanToCsv sbc = new StatefulBeanToCsvBuilder(writer).withSeparator(CSVWriter.DEFAULT_SEPARATOR)
+                .build();
+
+            List<CsvBean> list = new ArrayList<>();
+            list.add(new WriteExampleBean("Test1", "sfdsf", "fdfd"));
+            list.add(new WriteExampleBean("Test2", "ipso", "facto"));
+
+            sbc.write(list);
+            writer.close();
+
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return Helpers.readFile(path);
+    }
+}

libraries-data-2/src/main/com/baeldung/opencsv/examples/sync/CsvReaderExamples.java

@@ -0,0 +1,63 @@
+package com.baeldung.opencsv.examples.sync;
+
+import com.baeldung.opencsv.helpers.Helpers;
+import com.opencsv.CSVParser;
+import com.opencsv.CSVParserBuilder;
+import com.opencsv.CSVReader;
+import com.opencsv.CSVReaderBuilder;
+
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.List;
+
+public class CsvReaderExamples {
+
+    public static List<String[]> readAll(Reader reader) {
+
+        CSVParser parser = new CSVParserBuilder()
+                .withSeparator(',')
+                .withIgnoreQuotations(true)
+                .build();
+
+        CSVReader csvReader = new CSVReaderBuilder(reader)
+                .withSkipLines(0)
+                .withCSVParser(parser)
+                .build();
+
+        List<String[]> list = new ArrayList<>();
+        try {
+            list = csvReader.readAll();
+            reader.close();
+            csvReader.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return list;
+    }
+
+    public static List<String[]> oneByOne(Reader reader) {
+        List<String[]> list = new ArrayList<>();
+        try {
+            CSVParser parser = new CSVParserBuilder()
+                    .withSeparator(',')
+                    .withIgnoreQuotations(true)
+                    .build();
+
+            CSVReader csvReader = new CSVReaderBuilder(reader)
+                    .withSkipLines(0)
+                    .withCSVParser(parser)
+                    .build();
+
+            String[] line;
+            while ((line = csvReader.readNext()) != null) {
+                list.add(line);
+            }
+            reader.close();
+            csvReader.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return list;
+    }
+
+}

libraries-data-2/src/main/com/baeldung/opencsv/examples/sync/CsvWriterExamples.java

@@ -0,0 +1,35 @@
+package com.baeldung.opencsv.examples.sync;
+
+import com.baeldung.opencsv.helpers.Helpers;
+import com.opencsv.CSVWriter;
+
+import java.io.FileWriter;
+import java.nio.file.Path;
+import java.util.List;
+
+public class CsvWriterExamples {
+
+    public static String csvWriterOneByOne(List<String[]> stringArray, Path path) {
+        try {
+            CSVWriter writer = new CSVWriter(new FileWriter(path.toString()));
+            for (String[] array : stringArray) {
+                writer.writeNext(array);
+            }
+            writer.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return Helpers.readFile(path);
+    }
+
+    public static String csvWriterAll(List<String[]> stringArray, Path path) {
+        try {
+            CSVWriter writer = new CSVWriter(new FileWriter(path.toString()));
+            writer.writeAll(stringArray);
+            writer.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return Helpers.readFile(path);
+    }
+}

libraries-data-2/src/main/com/baeldung/opencsv/helpers/Helpers.java

@@ -0,0 +1,108 @@
+package com.baeldung.opencsv.helpers;
+
+import com.baeldung.opencsv.Constants;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Helpers {
+
+    /**
+     * Write Files
+     */
+
+    public static Path fileOutAllPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.CSV_All).toURI();
+        return Paths.get(uri);
+    }
+
+    public static Path fileOutBeanPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.CSV_BEAN).toURI();
+        return Paths.get(uri);
+    }
+
+    public static Path fileOutOnePath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.CSV_ONE).toURI();
+        return Paths.get(uri);
+    }
+
+    /**
+     * Read Files
+     */
+
+    public static Path twoColumnCsvPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.TWO_COLUMN_CSV).toURI();
+        return Paths.get(uri);
+    }
+
+    public static Path fourColumnCsvPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.FOUR_COLUMN_CSV).toURI();
+        return Paths.get(uri);
+    }
+
+    public static Path namedColumnCsvPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.NAMED_COLUMN_CSV).toURI();
+        return Paths.get(uri);
+    }
+
+    /**
+     * Simple File Reader
+     */
+
+    public static String readFile(Path path) {
+        String response = "";
+        try {
+            FileReader fr = new FileReader(path.toString());
+            BufferedReader br = new BufferedReader(fr);
+            String strLine;
+            StringBuffer sb = new StringBuffer();
+            while ((strLine = br.readLine()) != null) {
+                sb.append(strLine);
+            }
+            response = sb.toString();
+            System.out.println(response);
+            fr.close();
+            br.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return response;
+    }
+
+    /**
+     * Dummy Data for Writing.
+     */
+
+    public static List<String[]> twoColumnCsvString() {
+        List<String[]> list = new ArrayList<>();
+        list.add(new String[]{"ColA", "ColB"});
+        list.add(new String[]{"A", "B"});
+        return list;
+    }
+
+    public static List<String[]> fourColumnCsvString() {
+        List<String[]> list = new ArrayList<>();
+        list.add(new String[]{"ColA", "ColB", "ColC", "ColD"});
+        list.add(new String[]{"A", "B", "A", "B"});
+        list.add(new String[]{"BB", "AB", "AA", "B"});
+        return list;
+    }
+
+    /**
+     * Message Helpers
+     */
+
+    public static void print(String msg) {
+        System.out.println(msg);
+    }
+
+    public static void err(Exception ex) {
+        System.out.println(Constants.GENERIC_EXCEPTION + " " + ex);
+    }
+}

libraries-data-2/src/main/com/baeldung/opencsv/pojos/CsvTransfer.java

@@ -0,0 +1,38 @@
+package com.baeldung.opencsv.pojos;
+
+import com.baeldung.opencsv.beans.CsvBean;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CsvTransfer {
+
+    private List<String[]> csvStringList;
+
+    private List<CsvBean> csvList;
+
+    public CsvTransfer() {}
+
+    public List<String[]> getCsvStringList() {
+        if (csvStringList != null) return csvStringList;
+        return new ArrayList<String[]>();
+    }
+
+    public void addLine(String[] line) {
+        if (this.csvList == null) this.csvStringList = new ArrayList<>();
+        this.csvStringList.add(line);
+    }
+
+    public void setCsvStringList(List<String[]> csvStringList) {
+        this.csvStringList = csvStringList;
+    }
+
+    public void setCsvList(List<CsvBean> csvList) {
+        this.csvList = csvList;
+    }
+
+    public List<CsvBean> getCsvList() {
+        if (csvList != null) return csvList;
+        return new ArrayList<CsvBean>();
+    }
+}

libraries-data-2/src/main/com/baeldung/smooks/converter/OrderConverter.java

@@ -0,0 +1,44 @@
+package com.baeldung.smooks.converter;
+
+import com.baeldung.smooks.model.Order;
+import org.milyn.Smooks;
+import org.milyn.payload.JavaResult;
+import org.milyn.payload.StringResult;
+import org.xml.sax.SAXException;
+
+import javax.xml.transform.stream.StreamSource;
+import java.io.IOException;
+
+public class OrderConverter {
+
+    public Order convertOrderXMLToOrderObject(String path) throws IOException, SAXException {
+        Smooks smooks = new Smooks(OrderConverter.class.getResourceAsStream("/smooks/smooks-mapping.xml"));
+        try {
+            JavaResult javaResult = new JavaResult();
+            smooks.filterSource(new StreamSource(OrderConverter.class.getResourceAsStream(path)), javaResult);
+            return (Order) javaResult.getBean("order");
+        } finally {
+            smooks.close();
+        }
+    }
+
+    public String convertOrderXMLtoEDIFACT(String path) throws IOException, SAXException {
+        return convertDocumentWithTempalte(path, "/smooks/smooks-transform-edi.xml");
+    }
+
+    public String convertOrderXMLtoEmailMessage(String path) throws IOException, SAXException {
+        return convertDocumentWithTempalte(path, "/smooks/smooks-transform-email.xml");
+    }
+
+    private String convertDocumentWithTempalte(String path, String config) throws IOException, SAXException {
+        Smooks smooks = new Smooks(config);
+
+        try {
+            StringResult stringResult = new StringResult();
+            smooks.filterSource(new StreamSource(OrderConverter.class.getResourceAsStream(path)), stringResult);
+            return stringResult.toString();
+        } finally {
+            smooks.close();
+        }
+    }
+}

libraries-data-2/src/main/com/baeldung/smooks/converter/OrderValidator.java

@@ -0,0 +1,27 @@
+package com.baeldung.smooks.converter;
+
+import org.milyn.Smooks;
+import org.milyn.payload.JavaResult;
+import org.milyn.payload.StringResult;
+import org.milyn.validation.ValidationResult;
+import org.xml.sax.SAXException;
+
+import javax.xml.transform.stream.StreamSource;
+import java.io.IOException;
+
+public class OrderValidator {
+
+    public ValidationResult validate(String path) throws IOException, SAXException {
+        Smooks smooks = new Smooks(OrderValidator.class.getResourceAsStream("/smooks/smooks-validation.xml"));
+
+        try {
+            StringResult xmlResult = new StringResult();
+            JavaResult javaResult = new JavaResult();
+            ValidationResult validationResult = new ValidationResult();
+            smooks.filterSource(new StreamSource(OrderValidator.class.getResourceAsStream(path)), xmlResult, javaResult, validationResult);
+            return validationResult;
+        } finally {
+            smooks.close();
+        }
+    }
+}

libraries-data-2/src/main/com/baeldung/smooks/model/Item.java

@@ -0,0 +1,70 @@
+package com.baeldung.smooks.model;
+
+public class Item {
+
+    public Item() {
+    }
+
+    public Item(String code, Double price, Integer quantity) {
+        this.code = code;
+        this.price = price;
+        this.quantity = quantity;
+    }
+
+    private String code;
+    private Double price;
+    private Integer quantity;
+
+    public String getCode() {
+        return code;
+    }
+
+    public void setCode(String code) {
+        this.code = code;
+    }
+
+    public Double getPrice() {
+        return price;
+    }
+
+    public void setPrice(Double price) {
+        this.price = price;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+
+        Item item = (Item) o;
+
+        if (code != null ? !code.equals(item.code) : item.code != null)
+            return false;
+        if (price != null ? !price.equals(item.price) : item.price != null)
+            return false;
+        return quantity != null ? quantity.equals(item.quantity) : item.quantity == null;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = code != null ? code.hashCode() : 0;
+        result = 31 * result + (price != null ? price.hashCode() : 0);
+        result = 31 * result + (quantity != null ? quantity.hashCode() : 0);
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "Item{" + "code='" + code + '\'' + ", price=" + price + ", quantity=" + quantity + '}';
+    }
+}

libraries-data-2/src/main/com/baeldung/smooks/model/Order.java

@@ -0,0 +1,52 @@
+package com.baeldung.smooks.model;
+
+import java.util.Date;
+import java.util.List;
+
+public class Order {
+    private Date creationDate;
+    private Long number;
+    private Status status;
+    private Supplier supplier;
+    private List<Item> items;
+
+    public Date getCreationDate() {
+        return creationDate;
+    }
+
+    public void setCreationDate(Date creationDate) {
+        this.creationDate = creationDate;
+    }
+
+    public Long getNumber() {
+        return number;
+    }
+
+    public void setNumber(Long number) {
+        this.number = number;
+    }
+
+    public Status getStatus() {
+        return status;
+    }
+
+    public void setStatus(Status status) {
+        this.status = status;
+    }
+
+    public Supplier getSupplier() {
+        return supplier;
+    }
+
+    public void setSupplier(Supplier supplier) {
+        this.supplier = supplier;
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

libraries-data-2/src/main/com/baeldung/smooks/model/Status.java

@@ -0,0 +1,5 @@
+package com.baeldung.smooks.model;
+
+public enum Status {
+    NEW, IN_PROGRESS, FINISHED
+}

libraries-data-2/src/main/com/baeldung/smooks/model/Supplier.java

@@ -0,0 +1,52 @@
+package com.baeldung.smooks.model;
+
+public class Supplier {
+
+    private String name;
+    private String phoneNumber;
+
+    public Supplier() {
+    }
+
+    public Supplier(String name, String phoneNumber) {
+        this.name = name;
+        this.phoneNumber = phoneNumber;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPhoneNumber() {
+        return phoneNumber;
+    }
+
+    public void setPhoneNumber(String phoneNumber) {
+        this.phoneNumber = phoneNumber;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+
+        Supplier supplier = (Supplier) o;
+
+        if (name != null ? !name.equals(supplier.name) : supplier.name != null)
+            return false;
+        return phoneNumber != null ? phoneNumber.equals(supplier.phoneNumber) : supplier.phoneNumber == null;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = name != null ? name.hashCode() : 0;
+        result = 31 * result + (phoneNumber != null ? phoneNumber.hashCode() : 0);
+        return result;
+    }
+}

libraries-data-2/src/test/com/baeldung/crdt/CRDTUnitTest.java

@@ -0,0 +1,149 @@
+package com.baeldung.crdt;
+
+import com.netopyr.wurmloch.crdt.GCounter;
+import com.netopyr.wurmloch.crdt.GSet;
+import com.netopyr.wurmloch.crdt.LWWRegister;
+import com.netopyr.wurmloch.crdt.PNCounter;
+import com.netopyr.wurmloch.store.LocalCrdtStore;
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class CRDTUnitTest {
+
+    @Test
+    public void givenGrowOnlySet_whenTwoReplicasDiverge_thenShouldMergeItWithoutAConflict() {
+        // given
+        final LocalCrdtStore crdtStore1 = new LocalCrdtStore();
+        final LocalCrdtStore crdtStore2 = new LocalCrdtStore();
+        crdtStore1.connect(crdtStore2);
+
+        final GSet<String> replica1 = crdtStore1.createGSet("ID_1");
+        final GSet<String> replica2 = crdtStore2.<String> findGSet("ID_1").get();
+
+        // when
+        replica1.add("apple");
+        replica2.add("banana");
+
+        // then
+        assertThat(replica1).contains("apple", "banana");
+        assertThat(replica2).contains("apple", "banana");
+
+        // when
+        crdtStore1.disconnect(crdtStore2);
+
+        replica1.add("strawberry");
+        replica2.add("pear");
+
+        assertThat(replica1).contains("apple", "banana", "strawberry");
+        assertThat(replica2).contains("apple", "banana", "pear");
+
+        crdtStore1.connect(crdtStore2);
+
+        // then
+        assertThat(replica1).contains("apple", "banana", "strawberry", "pear");
+        assertThat(replica2).contains("apple", "banana", "strawberry", "pear");
+    }
+
+    @Test
+    public void givenIncrementOnlyCounter_whenTwoReplicasDiverge_thenShouldMergeIt() {
+        // given
+        final LocalCrdtStore crdtStore1 = new LocalCrdtStore();
+        final LocalCrdtStore crdtStore2 = new LocalCrdtStore();
+        crdtStore1.connect(crdtStore2);
+
+        final GCounter replica1 = crdtStore1.createGCounter("ID_1");
+        final GCounter replica2 = crdtStore2.findGCounter("ID_1").get();
+
+        // when
+        replica1.increment();
+        replica2.increment(2L);
+
+        // then
+        assertThat(replica1.get()).isEqualTo(3L);
+        assertThat(replica2.get()).isEqualTo(3L);
+
+        // when
+        crdtStore1.disconnect(crdtStore2);
+
+        replica1.increment(3L);
+        replica2.increment(5L);
+
+        assertThat(replica1.get()).isEqualTo(6L);
+        assertThat(replica2.get()).isEqualTo(8L);
+
+        crdtStore1.connect(crdtStore2);
+
+        // then
+        assertThat(replica1.get()).isEqualTo(11L);
+        assertThat(replica2.get()).isEqualTo(11L);
+    }
+
+    @Test
+    public void givenPNCounter_whenReplicasDiverge_thenShouldMergeWithoutAConflict() {
+        // given
+        final LocalCrdtStore crdtStore1 = new LocalCrdtStore();
+        final LocalCrdtStore crdtStore2 = new LocalCrdtStore();
+        crdtStore1.connect(crdtStore2);
+
+        final PNCounter replica1 = crdtStore1.createPNCounter("ID_1");
+        final PNCounter replica2 = crdtStore2.findPNCounter("ID_1").get();
+
+        // when
+        replica1.increment();
+        replica2.decrement(2L);
+
+        // then
+        assertThat(replica1.get()).isEqualTo(-1L);
+        assertThat(replica2.get()).isEqualTo(-1L);
+
+        // when
+        crdtStore1.disconnect(crdtStore2);
+
+        replica1.decrement(3L);
+        replica2.increment(5L);
+
+        assertThat(replica1.get()).isEqualTo(-4L);
+        assertThat(replica2.get()).isEqualTo(4L);
+
+        crdtStore1.connect(crdtStore2);
+
+        // then
+        assertThat(replica1.get()).isEqualTo(1L);
+        assertThat(replica2.get()).isEqualTo(1L);
+    }
+
+    @Test
+    public void givenLastWriteWinsStrategy_whenReplicasDiverge_thenAfterMergeShouldKeepOnlyLastValue() {
+        // given
+        final LocalCrdtStore crdtStore1 = new LocalCrdtStore("N_1");
+        final LocalCrdtStore crdtStore2 = new LocalCrdtStore("N_2");
+        crdtStore1.connect(crdtStore2);
+
+        final LWWRegister<String> replica1 = crdtStore1.createLWWRegister("ID_1");
+        final LWWRegister<String> replica2 = crdtStore2.<String> findLWWRegister("ID_1").get();
+
+        // when
+        replica1.set("apple");
+        replica2.set("banana");
+
+        // then
+        assertThat(replica1.get()).isEqualTo("banana");
+        assertThat(replica2.get()).isEqualTo("banana");
+
+        // when
+        crdtStore1.disconnect(crdtStore2);
+
+        replica1.set("strawberry");
+        replica2.set("pear");
+
+        assertThat(replica1.get()).isEqualTo("strawberry");
+        assertThat(replica2.get()).isEqualTo("pear");
+
+        crdtStore1.connect(crdtStore2);
+
+        // then
+        assertThat(replica1.get()).isEqualTo("pear");
+        assertThat(replica2.get()).isEqualTo("pear");
+    }
+}

libraries-data-2/src/test/com/baeldung/flink/BackupCreatorIntegrationTest.java

@@ -0,0 +1,104 @@
+package com.baeldung.flink;
+
+import com.baeldung.flink.model.Backup;
+import com.baeldung.flink.model.InputMessage;
+import com.baeldung.flink.operator.BackupAggregator;
+import com.baeldung.flink.operator.InputMessageTimestampAssigner;
+import com.baeldung.flink.schema.BackupSerializationSchema;
+import com.baeldung.flink.schema.InputMessageDeserializationSchema;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import org.apache.commons.collections.ListUtils;
+import org.apache.flink.api.common.serialization.DeserializationSchema;
+import org.apache.flink.api.common.serialization.SerializationSchema;
+import org.apache.flink.streaming.api.TimeCharacteristic;
+import org.apache.flink.streaming.api.datastream.DataStreamSource;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.sink.SinkFunction;
+import org.apache.flink.streaming.api.windowing.time.Time;
+import org.awaitility.Awaitility;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+public class BackupCreatorIntegrationTest {
+    public static ObjectMapper mapper;
+
+    @Before
+    public void setup() {
+        mapper = new ObjectMapper().registerModule(new JavaTimeModule());
+    }
+
+    @Test
+    public void givenProperJson_whenDeserializeIsInvoked_thenProperObjectIsReturned() throws IOException {
+        InputMessage message = new InputMessage("Me", "User", LocalDateTime.now(), "Test Message");
+        byte[] messageSerialized = mapper.writeValueAsBytes(message);
+        DeserializationSchema<InputMessage> deserializationSchema = new InputMessageDeserializationSchema();
+        InputMessage messageDeserialized = deserializationSchema.deserialize(messageSerialized);
+
+        assertEquals(message, messageDeserialized);
+    }
+
+    @Test
+    public void givenMultipleInputMessagesFromDifferentDays_whenBackupCreatorIsUser_thenMessagesAreGroupedProperly() throws Exception {
+        LocalDateTime currentTime = LocalDateTime.now();
+        InputMessage message = new InputMessage("Me", "User", currentTime, "First TestMessage");
+        InputMessage secondMessage = new InputMessage("Me", "User", currentTime.plusHours(1), "First TestMessage");
+        InputMessage thirdMessage = new InputMessage("Me", "User", currentTime.plusHours(2), "First TestMessage");
+        InputMessage fourthMessage = new InputMessage("Me", "User", currentTime.plusHours(3), "First TestMessage");
+        InputMessage fifthMessage = new InputMessage("Me", "User", currentTime.plusHours(25), "First TestMessage");
+        InputMessage sixthMessage = new InputMessage("Me", "User", currentTime.plusHours(26), "First TestMessage");
+
+        List<InputMessage> firstBackupMessages = Arrays.asList(message, secondMessage, thirdMessage, fourthMessage);
+        List<InputMessage> secondBackupMessages = Arrays.asList(fifthMessage, sixthMessage);
+        List<InputMessage> inputMessages = ListUtils.union(firstBackupMessages, secondBackupMessages);
+
+        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
+        env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
+        env.setParallelism(1);
+        DataStreamSource<InputMessage> testDataSet = env.fromCollection(inputMessages);
+        CollectingSink sink = new CollectingSink();
+        testDataSet.assignTimestampsAndWatermarks(new InputMessageTimestampAssigner())
+          .timeWindowAll(Time.hours(24))
+          .aggregate(new BackupAggregator())
+          .addSink(sink);
+
+        env.execute();
+
+        Awaitility.await().until(() ->  sink.backups.size() == 2);
+        assertEquals(2, sink.backups.size());
+        assertEquals(firstBackupMessages, sink.backups.get(0).getInputMessages());
+        assertEquals(secondBackupMessages, sink.backups.get(1).getInputMessages());
+
+    }
+
+    @Test
+    public void givenProperBackupObject_whenSerializeIsInvoked_thenObjectIsProperlySerialized() throws IOException {
+        InputMessage message = new InputMessage("Me", "User", LocalDateTime.now(), "Test Message");
+        List<InputMessage> messages = Arrays.asList(message);
+        Backup backup = new Backup(messages, LocalDateTime.now());
+        byte[] backupSerialized = mapper.writeValueAsBytes(backup);
+        SerializationSchema<Backup> serializationSchema = new BackupSerializationSchema();
+        byte[] backupProcessed = serializationSchema.serialize(backup);
+        
+        assertArrayEquals(backupSerialized, backupProcessed);
+    }
+
+    private static class CollectingSink implements SinkFunction<Backup> {
+        
+        public static List<Backup> backups = new ArrayList<>();
+
+        @Override
+        public synchronized void invoke(Backup value, Context context) throws Exception {
+            backups.add(value);
+        }
+    }
+}

libraries-data-2/src/test/com/baeldung/flink/WordCapitalizerIntegrationTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.flink;
+
+import com.baeldung.flink.operator.WordsCapitalizer;
+import org.apache.flink.api.java.DataSet;
+import org.apache.flink.api.java.ExecutionEnvironment;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class WordCapitalizerIntegrationTest {
+
+    @Test
+    public void givenDataSet_whenExecuteWordCapitalizer_thenReturnCapitalizedWords() throws Exception {
+        ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
+        List<String> data = Arrays.asList("dog", "cat", "wolf", "pig");
+
+         DataSet<String> testDataSet = env.fromCollection(data);
+
+
+        List<String> dataProcessed = testDataSet
+          .map(new WordsCapitalizer())
+          .collect();
+
+        List<String> testDataCapitalized = data.stream()
+          .map(String::toUpperCase)
+          .collect(Collectors.toList());
+
+        Assert.assertEquals(testDataCapitalized, dataProcessed);
+    }
+
+}

libraries-data-2/src/test/com/baeldung/flink/WordCountIntegrationTest.java

@@ -0,0 +1,161 @@
+package com.baeldung.flink;
+
+import org.apache.flink.api.common.operators.Order;
+import org.apache.flink.api.java.DataSet;
+import org.apache.flink.api.java.ExecutionEnvironment;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.api.java.tuple.Tuple3;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.timestamps.BoundedOutOfOrdernessTimestampExtractor;
+import org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows;
+import org.apache.flink.streaming.api.windowing.time.Time;
+import org.junit.Test;
+
+import java.time.ZonedDateTime;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class WordCountIntegrationTest {
+    private final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
+
+    @Test
+    public void givenDataSet_whenExecuteWordCount_thenReturnWordCount() throws Exception {
+        // given
+        List<String> lines = Arrays.asList("This is a first sentence", "This is a second sentence with a one word");
+
+        // when
+        DataSet<Tuple2<String, Integer>> result = WordCount.startWordCount(env, lines);
+
+        // then
+        List<Tuple2<String, Integer>> collect = result.collect();
+        assertThat(collect).containsExactlyInAnyOrder(new Tuple2<>("a", 3), new Tuple2<>("sentence", 2), new Tuple2<>("word", 1), new Tuple2<>("is", 2), new Tuple2<>("this", 2), new Tuple2<>("second", 1), new Tuple2<>("first", 1), new Tuple2<>("with", 1),
+                new Tuple2<>("one", 1));
+    }
+
+    @Test
+    public void givenListOfAmounts_whenUseMapReduce_thenSumAmountsThatAreOnlyAboveThreshold() throws Exception {
+        // given
+        DataSet<Integer> amounts = env.fromElements(1, 29, 40, 50);
+        int threshold = 30;
+
+        // when
+        List<Integer> collect = amounts.filter(a -> a > threshold).reduce((integer, t1) -> integer + t1).collect();
+
+        // then
+        assertThat(collect.get(0)).isEqualTo(90);
+    }
+
+    @Test
+    public void givenDataSetOfComplexObjects_whenMapToGetOneField_thenReturnedListHaveProperElements() throws Exception {
+        // given
+        DataSet<Person> personDataSource = env.fromCollection(Arrays.asList(new Person(23, "Tom"), new Person(75, "Michael")));
+
+        // when
+        List<Integer> ages = personDataSource.map(p -> p.age).collect();
+
+        // then
+        assertThat(ages).hasSize(2);
+        assertThat(ages).contains(23, 75);
+
+    }
+
+    @Test
+    public void givenDataSet_whenSortItByOneField_thenShouldReturnSortedDataSet() throws Exception {
+        // given
+        Tuple2<Integer, String> secondPerson = new Tuple2<>(4, "Tom");
+        Tuple2<Integer, String> thirdPerson = new Tuple2<>(5, "Scott");
+        Tuple2<Integer, String> fourthPerson = new Tuple2<>(200, "Michael");
+        Tuple2<Integer, String> firstPerson = new Tuple2<>(1, "Jack");
+        DataSet<Tuple2<Integer, String>> transactions = env.fromElements(fourthPerson, secondPerson, thirdPerson, firstPerson);
+
+        // when
+        List<Tuple2<Integer, String>> sorted = transactions.sortPartition(new IdKeySelectorTransaction(), Order.ASCENDING).collect();
+
+        // then
+        assertThat(sorted).containsExactly(firstPerson, secondPerson, thirdPerson, fourthPerson);
+    }
+
+    @Test
+    public void giveTwoDataSets_whenJoinUsingId_thenProduceJoinedData() throws Exception {
+        // given
+        Tuple3<Integer, String, String> address = new Tuple3<>(1, "5th Avenue", "London");
+        DataSet<Tuple3<Integer, String, String>> addresses = env.fromElements(address);
+
+        Tuple2<Integer, String> firstTransaction = new Tuple2<>(1, "Transaction_1");
+        DataSet<Tuple2<Integer, String>> transactions = env.fromElements(firstTransaction, new Tuple2<>(12, "Transaction_2"));
+
+        // when
+        List<Tuple2<Tuple2<Integer, String>, Tuple3<Integer, String, String>>> joined = transactions.join(addresses).where(new IdKeySelectorTransaction()).equalTo(new IdKeySelectorAddress()).collect();
+
+        // then
+        assertThat(joined).hasSize(1);
+        assertThat(joined).contains(new Tuple2<>(firstTransaction, address));
+
+    }
+
+    @Test
+    public void givenStreamOfEvents_whenProcessEvents_thenShouldPrintResultsOnSinkOperation() throws Exception {
+        // given
+        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
+
+        DataStream<String> text = env.fromElements("This is a first sentence", "This is a second sentence with a one word");
+
+        SingleOutputStreamOperator<String> upperCase = text.map(String::toUpperCase);
+
+        upperCase.print();
+
+        // when
+        env.execute();
+    }
+
+    @Test
+    public void givenStreamOfEvents_whenProcessEvents_thenShouldApplyWindowingOnTransformation() throws Exception {
+        // given
+        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
+
+        SingleOutputStreamOperator<Tuple2<Integer, Long>> windowed = env.fromElements(new Tuple2<>(16, ZonedDateTime.now().plusMinutes(25).toInstant().getEpochSecond()), new Tuple2<>(15, ZonedDateTime.now().plusMinutes(2).toInstant().getEpochSecond()))
+                .assignTimestampsAndWatermarks(new BoundedOutOfOrdernessTimestampExtractor<Tuple2<Integer, Long>>(Time.seconds(20)) {
+                    @Override
+                    public long extractTimestamp(Tuple2<Integer, Long> element) {
+                        return element.f1 * 1000;
+                    }
+                });
+
+        SingleOutputStreamOperator<Tuple2<Integer, Long>> reduced = windowed.windowAll(TumblingEventTimeWindows.of(Time.seconds(5))).maxBy(0, true);
+
+        reduced.print();
+
+        // when
+        env.execute();
+    }
+
+    private static class IdKeySelectorTransaction implements KeySelector<Tuple2<Integer, String>, Integer> {
+        @Override
+        public Integer getKey(Tuple2<Integer, String> value) {
+            return value.f0;
+        }
+    }
+
+    private static class IdKeySelectorAddress implements KeySelector<Tuple3<Integer, String, String>, Integer> {
+        @Override
+        public Integer getKey(Tuple3<Integer, String, String> value) {
+            return value.f0;
+        }
+    }
+
+    private static class Person {
+        private final int age;
+        private final String name;
+
+        private Person(int age, String name) {
+            this.age = age;
+            this.name = name;
+        }
+    }
+
+}

libraries-data-2/src/test/com/baeldung/google/sheets/GoogleSheetsLiveTest.java

@@ -0,0 +1,96 @@
+package com.baeldung.google.sheets;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import com.google.api.services.sheets.v4.Sheets;
+import com.google.api.services.sheets.v4.model.AppendValuesResponse;
+import com.google.api.services.sheets.v4.model.BatchGetValuesResponse;
+import com.google.api.services.sheets.v4.model.BatchUpdateSpreadsheetRequest;
+import com.google.api.services.sheets.v4.model.BatchUpdateValuesRequest;
+import com.google.api.services.sheets.v4.model.BatchUpdateValuesResponse;
+import com.google.api.services.sheets.v4.model.CopyPasteRequest;
+import com.google.api.services.sheets.v4.model.GridRange;
+import com.google.api.services.sheets.v4.model.Request;
+import com.google.api.services.sheets.v4.model.Spreadsheet;
+import com.google.api.services.sheets.v4.model.SpreadsheetProperties;
+import com.google.api.services.sheets.v4.model.UpdateSpreadsheetPropertiesRequest;
+import com.google.api.services.sheets.v4.model.UpdateValuesResponse;
+import com.google.api.services.sheets.v4.model.ValueRange;
+
+import static org.assertj.core.api.Assertions.*;
+
+public class GoogleSheetsLiveTest {
+
+    private static Sheets sheetsService;
+
+    // this id can be replaced with your spreadsheet id
+    // otherwise be advised that multiple people may run this test and update the public spreadsheet
+    private static final String SPREADSHEET_ID = "1sILuxZUnyl_7-MlNThjt765oWshN3Xs-PPLfqYe4DhI";
+
+    @BeforeClass
+    public static void setup() throws GeneralSecurityException, IOException {
+        sheetsService = SheetsServiceUtil.getSheetsService();
+    }
+
+    @Test
+    public void whenWriteSheet_thenReadSheetOk() throws IOException {
+        ValueRange body = new ValueRange().setValues(Arrays.asList(Arrays.asList("Expenses January"), Arrays.asList("books", "30"), Arrays.asList("pens", "10"), Arrays.asList("Expenses February"), Arrays.asList("clothes", "20"), Arrays.asList("shoes", "5")));
+        UpdateValuesResponse result = sheetsService.spreadsheets().values().update(SPREADSHEET_ID, "A1", body).setValueInputOption("RAW").execute();
+
+        List<ValueRange> data = new ArrayList<>();
+        data.add(new ValueRange().setRange("D1").setValues(Arrays.asList(Arrays.asList("January Total", "=B2+B3"))));
+        data.add(new ValueRange().setRange("D4").setValues(Arrays.asList(Arrays.asList("February Total", "=B5+B6"))));
+
+        BatchUpdateValuesRequest batchBody = new BatchUpdateValuesRequest().setValueInputOption("USER_ENTERED").setData(data);
+        BatchUpdateValuesResponse batchResult = sheetsService.spreadsheets().values().batchUpdate(SPREADSHEET_ID, batchBody).execute();
+
+        List<String> ranges = Arrays.asList("E1", "E4");
+        BatchGetValuesResponse readResult = sheetsService.spreadsheets().values().batchGet(SPREADSHEET_ID).setRanges(ranges).execute();
+
+        ValueRange januaryTotal = readResult.getValueRanges().get(0);
+        assertThat(januaryTotal.getValues().get(0).get(0)).isEqualTo("40");
+
+        ValueRange febTotal = readResult.getValueRanges().get(1);
+        assertThat(febTotal.getValues().get(0).get(0)).isEqualTo("25");
+
+        ValueRange appendBody = new ValueRange().setValues(Arrays.asList(Arrays.asList("Total", "=E1+E4")));
+        AppendValuesResponse appendResult = sheetsService.spreadsheets().values().append(SPREADSHEET_ID, "A1", appendBody).setValueInputOption("USER_ENTERED").setInsertDataOption("INSERT_ROWS").setIncludeValuesInResponse(true).execute();
+
+        ValueRange total = appendResult.getUpdates().getUpdatedData();
+        assertThat(total.getValues().get(0).get(1)).isEqualTo("65");
+    }
+
+    @Test
+    public void whenUpdateSpreadSheetTitle_thenOk() throws IOException {
+
+        UpdateSpreadsheetPropertiesRequest updateRequest = new UpdateSpreadsheetPropertiesRequest().setFields("*").setProperties(new SpreadsheetProperties().setTitle("Expenses"));
+
+        CopyPasteRequest copyRequest = new CopyPasteRequest().setSource(new GridRange().setSheetId(0).setStartColumnIndex(0).setEndColumnIndex(2).setStartRowIndex(0).setEndRowIndex(1))
+                .setDestination(new GridRange().setSheetId(1).setStartColumnIndex(0).setEndColumnIndex(2).setStartRowIndex(0).setEndRowIndex(1)).setPasteType("PASTE_VALUES");
+
+        List<Request> requests = new ArrayList<>();
+
+        requests.add(new Request().setCopyPaste(copyRequest));
+        requests.add(new Request().setUpdateSpreadsheetProperties(updateRequest));
+
+        BatchUpdateSpreadsheetRequest body = new BatchUpdateSpreadsheetRequest().setRequests(requests);
+
+        sheetsService.spreadsheets().batchUpdate(SPREADSHEET_ID, body).execute();
+    }
+
+    @Test
+    public void whenCreateSpreadSheet_thenIdOk() throws IOException {
+        Spreadsheet spreadSheet = new Spreadsheet().setProperties(new SpreadsheetProperties().setTitle("My Spreadsheet"));
+        Spreadsheet result = sheetsService.spreadsheets().create(spreadSheet).execute();
+
+        assertThat(result.getSpreadsheetId()).isNotNull();
+    }
+
+}

libraries-data-2/src/test/com/baeldung/hll/HLLLongRunningManualTest.java

@@ -0,0 +1,59 @@
+package com.baeldung.hll;
+
+import com.google.common.hash.HashFunction;
+import com.google.common.hash.Hashing;
+import net.agkn.hll.HLL;
+import org.assertj.core.data.Offset;
+import org.junit.Test;
+
+import java.util.stream.LongStream;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+public class HLLLongRunningManualTest {
+
+    @Test
+    public void givenHLL_whenAddHugeAmountOfNumbers_thenShouldReturnEstimatedCardinality() {
+        // given
+        long numberOfElements = 100_000_000;
+        long toleratedDifference = 1_000_000;
+        HashFunction hashFunction = Hashing.murmur3_128();
+        HLL hll = new HLL(14, 5);
+
+        // when
+        LongStream.range(0, numberOfElements).forEach(element -> {
+            long hashedValue = hashFunction.newHasher().putLong(element).hash().asLong();
+            hll.addRaw(hashedValue);
+        });
+
+        // then
+        long cardinality = hll.cardinality();
+        assertThat(cardinality).isCloseTo(numberOfElements, Offset.offset(toleratedDifference));
+    }
+
+    @Test
+    public void givenTwoHLLs_whenAddHugeAmountOfNumbers_thenShouldReturnEstimatedCardinalityForUnionOfHLLs() {
+        // given
+        long numberOfElements = 100_000_000;
+        long toleratedDifference = 1_000_000;
+        HashFunction hashFunction = Hashing.murmur3_128();
+        HLL firstHll = new HLL(15, 5);
+        HLL secondHLL = new HLL(15, 5);
+
+        // when
+        LongStream.range(0, numberOfElements).forEach(element -> {
+            long hashedValue = hashFunction.newHasher().putLong(element).hash().asLong();
+            firstHll.addRaw(hashedValue);
+        });
+
+        LongStream.range(numberOfElements, numberOfElements * 2).forEach(element -> {
+            long hashedValue = hashFunction.newHasher().putLong(element).hash().asLong();
+            secondHLL.addRaw(hashedValue);
+        });
+
+        // then
+        firstHll.union(secondHLL);
+        long cardinality = firstHll.cardinality();
+        assertThat(cardinality).isCloseTo(numberOfElements * 2, Offset.offset(toleratedDifference * 2));
+    }
+}

libraries-data-2/src/test/com/baeldung/infinispan/AbstractIntegrationTest.java

@@ -0,0 +1,57 @@
+package com.baeldung.infinispan;
+
+import com.baeldung.infinispan.listener.CacheListener;
+import com.baeldung.infinispan.repository.HelloWorldRepository;
+import com.baeldung.infinispan.service.HelloWorldService;
+import com.baeldung.infinispan.service.TransactionalService;
+import org.infinispan.Cache;
+import org.infinispan.manager.DefaultCacheManager;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Ignore;
+
+import java.util.function.Supplier;
+
+@Ignore
+public abstract class AbstractIntegrationTest {
+
+    private DefaultCacheManager cacheManager;
+
+    private HelloWorldRepository repository = new HelloWorldRepository();
+
+    protected HelloWorldService helloWorldService;
+    protected TransactionalService transactionalService;
+
+    @Before
+    public void setup() {
+        CacheConfiguration configuration = new CacheConfiguration();
+        CacheListener listener = new CacheListener();
+
+        cacheManager = configuration.cacheManager();
+
+        Cache<String, Integer> transactionalCache = configuration.transactionalCache(cacheManager, listener);
+
+        Cache<String, String> simpleHelloWorldCache = configuration.simpleHelloWorldCache(cacheManager, listener);
+
+        Cache<String, String> expiringHelloWorldCache = configuration.expiringHelloWorldCache(cacheManager, listener);
+
+        Cache<String, String> evictingHelloWorldCache = configuration.evictingHelloWorldCache(cacheManager, listener);
+
+        Cache<String, String> passivatingHelloWorldCache = configuration.passivatingHelloWorldCache(cacheManager, listener);
+
+        this.helloWorldService = new HelloWorldService(repository, listener, simpleHelloWorldCache, expiringHelloWorldCache, evictingHelloWorldCache, passivatingHelloWorldCache);
+
+        this.transactionalService = new TransactionalService(transactionalCache);
+    }
+
+    @After
+    public void tearDown() {
+        cacheManager.stop();
+    }
+
+    protected <T> long timeThis(Supplier<T> supplier) {
+        long millis = System.currentTimeMillis();
+        supplier.get();
+        return System.currentTimeMillis() - millis;
+    }
+}

libraries-data-2/src/test/com/baeldung/infinispan/service/HelloWorldServiceTemporaryLiveTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.infinispan.service;
+
+import com.baeldung.infinispan.AbstractIntegrationTest;
+import org.junit.Test;
+
+import static org.assertj.core.api.Java6Assertions.assertThat;
+
+public class HelloWorldServiceTemporaryLiveTest extends AbstractIntegrationTest {
+
+    @Test
+    public void whenGetIsCalledTwoTimes_thenTheSecondShouldHitTheCache() {
+        assertThat(timeThis(() -> helloWorldService.findSimpleHelloWorld())).isGreaterThanOrEqualTo(1000);
+
+        assertThat(timeThis(() -> helloWorldService.findSimpleHelloWorld())).isLessThan(100);
+    }
+
+    @Test
+    public void whenGetIsCalledTwoTimesQuickly_thenTheSecondShouldHitTheCache() {
+        assertThat(timeThis(() -> helloWorldService.findExpiringHelloWorld())).isGreaterThanOrEqualTo(1000);
+
+        assertThat(timeThis(() -> helloWorldService.findExpiringHelloWorld())).isLessThan(100);
+    }
+
+    @Test
+    public void whenGetIsCalledTwoTimesSparsely_thenNeitherShouldHitTheCache() throws InterruptedException {
+        assertThat(timeThis(() -> helloWorldService.findExpiringHelloWorld())).isGreaterThanOrEqualTo(1000);
+
+        Thread.sleep(1100);
+
+        assertThat(timeThis(() -> helloWorldService.findExpiringHelloWorld())).isGreaterThanOrEqualTo(1000);
+    }
+
+    @Test
+    public void givenOneEntryIsConfigured_whenTwoAreAdded_thenFirstShouldntBeAvailable() {
+        assertThat(timeThis(() -> helloWorldService.findEvictingHelloWorld("key 1"))).isGreaterThanOrEqualTo(1000);
+
+        assertThat(timeThis(() -> helloWorldService.findEvictingHelloWorld("key 2"))).isGreaterThanOrEqualTo(1000);
+
+        assertThat(timeThis(() -> helloWorldService.findEvictingHelloWorld("key 1"))).isGreaterThanOrEqualTo(1000);
+    }
+
+    @Test
+    public void givenOneEntryIsConfigured_whenTwoAreAdded_thenTheFirstShouldBeAvailable() {
+        assertThat(timeThis(() -> helloWorldService.findPassivatingHelloWorld("key 1"))).isGreaterThanOrEqualTo(1000);
+
+        assertThat(timeThis(() -> helloWorldService.findPassivatingHelloWorld("key 2"))).isGreaterThanOrEqualTo(1000);
+
+        assertThat(timeThis(() -> helloWorldService.findPassivatingHelloWorld("key 1"))).isLessThan(100);
+    }
+
+}

libraries-data-2/src/test/com/baeldung/infinispan/service/TransactionalServiceIntegrationTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.infinispan.service;
+
+import com.baeldung.infinispan.AbstractIntegrationTest;
+import org.junit.Test;
+
+import static org.assertj.core.api.Java6Assertions.assertThat;
+
+public class TransactionalServiceIntegrationTest extends AbstractIntegrationTest {
+
+    @Test
+    public void whenLockingAnEntry_thenItShouldBeInaccessible() throws InterruptedException {
+        Runnable backGroundJob = () -> transactionalService.startBackgroundBatch();
+        Thread backgroundThread = new Thread(backGroundJob);
+        transactionalService.getQuickHowManyVisits();
+        backgroundThread.start();
+        Thread.sleep(100); // lets wait our thread warm up
+
+        assertThat(timeThis(() -> transactionalService.getQuickHowManyVisits())).isGreaterThan(500).isLessThan(1000);
+    }
+
+}

libraries-data-2/src/test/com/baeldung/measurement/WaterTankUnitTest.java

@@ -0,0 +1,86 @@
+package com.baeldung.measurement;
+
+import javax.measure.Quantity;
+import javax.measure.quantity.Area;
+import javax.measure.quantity.Length;
+import javax.measure.quantity.Pressure;
+import javax.measure.quantity.Volume;
+
+import javax.measure.Unit;
+import javax.measure.UnitConverter;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import org.junit.Test;
+
+import com.baeldung.measurement.WaterTank;
+
+import tec.units.ri.format.SimpleUnitFormat;
+import tec.units.ri.quantity.Quantities;
+import tec.units.ri.unit.MetricPrefix;
+import static tec.units.ri.unit.Units.*;
+
+public class WaterTankUnitTest {
+
+    @Test
+    public void givenQuantity_whenGetUnitAndConvertValue_thenSuccess() {
+        WaterTank waterTank = new WaterTank();
+        waterTank.setCapacityMeasure(Quantities.getQuantity(9.2, LITRE));
+        assertEquals(LITRE, waterTank.getCapacityMeasure().getUnit());
+
+        Quantity<Volume> waterCapacity = waterTank.getCapacityMeasure();
+        double volumeInLitre = waterCapacity.getValue().doubleValue();
+        assertEquals(9.2, volumeInLitre, 0.0f);
+
+        double volumeInMilliLitre = waterCapacity.to(MetricPrefix.MILLI(LITRE)).getValue().doubleValue();
+        assertEquals(9200.0, volumeInMilliLitre, 0.0f);
+
+        // compilation error
+        // volumeInMilliLitre = waterCapacity.to(MetricPrefix.MILLI(KILOGRAM));
+
+        Unit<Length> Kilometer = MetricPrefix.KILO(METRE);
+
+        // compilation error
+        // Unit<Length> Centimeter = MetricPrefix.CENTI(LITRE);
+    }
+
+    @Test
+    public void givenUnit_whenAlternateUnit_ThenGetAlternateUnit() {
+
+        Unit<Pressure> PASCAL = NEWTON.divide(METRE.pow(2)).alternate("Pa").asType(Pressure.class);
+        assertTrue(SimpleUnitFormat.getInstance().parse("Pa").equals(PASCAL));
+    }
+
+    @Test
+    public void givenUnit_whenProduct_ThenGetProductUnit() {
+        Unit<Area> squareMetre = METRE.multiply(METRE).asType(Area.class);
+        Quantity<Length> line = Quantities.getQuantity(2, METRE);
+        assertEquals(line.multiply(line).getUnit(), squareMetre);
+    }
+
+    @Test
+    public void givenMeters_whenConvertToKilometer_ThenConverted() {
+        double distanceInMeters = 50.0;
+        UnitConverter metreToKilometre = METRE.getConverterTo(MetricPrefix.KILO(METRE));
+        double distanceInKilometers = metreToKilometre.convert(distanceInMeters);
+        assertEquals(0.05, distanceInKilometers, 0.00f);
+    }
+
+    @Test
+    public void givenSymbol_WhenCompareToSystemUnit_ThenSuccess() {
+        assertTrue(SimpleUnitFormat.getInstance().parse("kW").equals(MetricPrefix.KILO(WATT)));
+        assertTrue(SimpleUnitFormat.getInstance().parse("ms").equals(SECOND.divide(1000)));
+    }
+
+    @Test
+    public void givenUnits_WhenAdd_ThenSuccess() {
+        Quantity<Length> total = Quantities.getQuantity(2, METRE).add(Quantities.getQuantity(3, METRE));
+        assertEquals(total.getValue().intValue(), 5);
+
+        // compilation error
+        // Quantity<Length> total = Quantities.getQuantity(2, METRE).add(Quantities.getQuantity(3, LITRE));
+
+        Quantity<Length> totalKm = Quantities.getQuantity(2, METRE).add(Quantities.getQuantity(3, MetricPrefix.KILO(METRE)));
+        assertEquals(totalKm.getValue().intValue(), 3002);
+    }
+}

libraries-data-2/src/test/com/baeldung/opencsv/OpenCsvIntegrationTest.java

@@ -0,0 +1,66 @@
+package com.baeldung.opencsv;
+
+import com.baeldung.opencsv.helpers.Helpers;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class OpenCsvIntegrationTest {
+
+    private Object testReadCsv(Object result) {
+        assert (result != null);
+        assert (result instanceof String);
+        assert (!((String) result).isEmpty());
+        System.out.println(result);
+        return result;
+    }
+
+    private Object testWriteCsv(Object result) {
+        assert (result instanceof String);
+        assert (!((String) result).isEmpty());
+        return result;
+    }
+
+    @Before
+    public void setup() {
+    }
+
+    @Test
+    public void positionExampleTest() {
+        testReadCsv(Application.simpleSyncPositionBeanExample());
+    }
+
+    @Test
+    public void namedColumnExampleTest() {
+        testReadCsv(Application.namedSyncColumnBeanExample());
+    }
+
+    @Test
+    public void writeCsvUsingBeanBuilderTest() {
+        testWriteCsv(Application.writeSyncCsvFromBeanExample());
+    }
+
+    @Test
+    public void oneByOneExampleTest() {
+        testReadCsv(Application.oneByOneSyncExample());
+    }
+
+    @Test
+    public void readAllExampleTest() {
+        testReadCsv(Application.readAllSyncExample());
+    }
+
+    @Test
+    public void csvWriterOneByOneTest() {
+        testWriteCsv(Application.csvWriterSyncOneByOne());
+    }
+
+    @Test
+    public void csvWriterAllTest() {
+        testWriteCsv(Application.csvWriterSyncAll());
+    }
+
+    @After
+    public void close() {
+    }
+}

libraries-data-2/src/test/com/baeldung/smooks/converter/SmooksIntegrationTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.smooks.converter;
+
+import com.baeldung.smooks.model.Item;
+import com.baeldung.smooks.model.Order;
+import com.baeldung.smooks.model.Status;
+import com.baeldung.smooks.model.Supplier;
+import org.junit.Test;
+import org.milyn.validation.ValidationResult;
+import java.text.SimpleDateFormat;
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
+
+public class SmooksIntegrationTest {
+
+    private static final String EDIFACT_MESSAGE = "UNA:+.? '" + System.lineSeparator() + "UNH+771+IN_PROGRESS+2018-01-14'" + System.lineSeparator() + "CTA+CompanyX+1234567'" + System.lineSeparator() + "LIN+1+PX1234+9.99'" + System.lineSeparator()
+        + "LIN+2+RX990+120.32'" + System.lineSeparator();
+    private static final String EMAIL_MESSAGE = "Hi," + System.lineSeparator() + "Order number #771 created on 2018-01-14 is currently in IN_PROGRESS status." + System.lineSeparator() + "Consider contact supplier \"CompanyX\"  with phone number: \"1234567\"."
+        + System.lineSeparator() + "Order items:" + System.lineSeparator() + "1  X PX1234 (total price 9.99)" + System.lineSeparator() + "2  X RX990 (total price 240.64)" + System.lineSeparator();
+
+    @Test
+    public void givenOrderXML_whenConvert_thenPOJOsConstructedCorrectly() throws Exception {
+
+        OrderConverter xmlToJavaOrderConverter = new OrderConverter();
+        Order order = xmlToJavaOrderConverter.convertOrderXMLToOrderObject("/smooks/order.xml");
+
+        assertThat(order.getNumber(), is(771L));
+        assertThat(order.getStatus(), is(Status.IN_PROGRESS));
+        assertThat(order.getCreationDate(), is(new SimpleDateFormat("yyyy-MM-dd").parse("2018-01-14")));
+        assertThat(order.getSupplier(), is(new Supplier("CompanyX", "1234567")));
+        assertThat(order.getItems(), containsInAnyOrder(new Item("PX1234", 9.99, 1), new Item("RX990", 120.32, 2)));
+
+    }
+
+    @Test
+    public void givenIncorrectOrderXML_whenValidate_thenExpectValidationErrors() throws Exception {
+        OrderValidator orderValidator = new OrderValidator();
+        ValidationResult validationResult = orderValidator.validate("/smooks/order.xml");
+
+        assertThat(validationResult.getErrors(), hasSize(1));
+        // 1234567 didn't match ^[0-9\\-\\+]{9,15}$
+        assertThat(validationResult.getErrors()
+            .get(0)
+            .getFailRuleResult()
+            .getRuleName(), is("supplierPhone"));
+    }
+
+    @Test
+    public void givenOrderXML_whenApplyEDITemplate_thenConvertedToEDIFACT() throws Exception {
+        OrderConverter orderConverter = new OrderConverter();
+        String edifact = orderConverter.convertOrderXMLtoEDIFACT("/smooks/order.xml");
+        assertThat(edifact, is(EDIFACT_MESSAGE));
+    }
+
+    @Test
+    public void givenOrderXML_whenApplyEmailTemplate_thenConvertedToEmailMessage() throws Exception {
+        OrderConverter orderConverter = new OrderConverter();
+        String emailMessage = orderConverter.convertOrderXMLtoEmailMessage("/smooks/order.xml");
+        assertThat(emailMessage, is(EMAIL_MESSAGE));
+    }
+}