Merge remote-tracking branch 'upstream/master'

akka-http/pom.xml

@@ -1,16 +1,14 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
          xmlns="http://maven.apache.org/POM/4.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
-
     <modelVersion>4.0.0</modelVersion>
     <artifactId>akka-http</artifactId>
     <name>akka-http</name>
 
     <parent>
-		<artifactId>parent-modules</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
@@ -44,4 +42,5 @@
         <akka.http.version>10.0.11</akka.http.version>
         <akka.stream.version>2.5.11</akka.stream.version>
     </properties>
+
 </project>

akka-streams/pom.xml

@@ -6,8 +6,8 @@
     <name>akka-streams</name>
 
     <parent>
-        <artifactId>parent-modules</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 

algorithms-genetic/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -60,5 +61,4 @@
         <commons-codec.version>1.11</commons-codec.version>
     </properties>
 
-    
 </project>

algorithms-miscellaneous-1/pom.xml

@@ -1,3 +1,4 @@
+<?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>

algorithms-miscellaneous-2/pom.xml

@@ -1,3 +1,4 @@
+<?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>

algorithms-miscellaneous-3/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -91,4 +92,5 @@
         <jmh-core.version>1.19</jmh-core.version>
         <jmh-generator.version>1.19</jmh-generator.version>
     </properties>
+
 </project>

algorithms-miscellaneous-4/pom.xml

@@ -1,3 +1,4 @@
+<?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>

algorithms-miscellaneous-4/src/test/java/com/baeldung/algorithms/smallestinteger/SmallestMissingPositiveIntegerUnitTest.java

@@ -85,4 +85,13 @@ class SmallestMissingPositiveIntegerUnitTest {
 
         assertThat(result).isEqualTo(input.length);
     }
+
+    @Test
+    void givenArrayWithoutZero_whenSearchInUnsortedArrayBooleanArray_thenZero() {
+        int[] input = new int[] {11, 13, 14, 15};
+
+        int result = SmallestMissingPositiveInteger.searchInUnsortedArrayBooleanArray(input);
+
+        assertThat(result).isEqualTo(0);
+    }
 }

algorithms-miscellaneous-5/pom.xml

@@ -1,3 +1,4 @@
+<?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>

algorithms-searching/pom.xml

@@ -1,3 +1,4 @@
+<?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>

algorithms-sorting/pom.xml

@@ -1,3 +1,4 @@
+<?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>

animal-sniffer-mvn-plugin/pom.xml

@@ -1,3 +1,4 @@
+<?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
@@ -43,4 +44,5 @@
         <animal-sniffer-maven-plugin.version>1.16</animal-sniffer-maven-plugin.version>
         <org.codehaus.mojo.signature.java16.version>1.0</org.codehaus.mojo.signature.java16.version>
     </properties>
+    
 </project>

annotations/annotation-user/pom.xml

@@ -6,8 +6,8 @@
     <name>annotation-user</name>
 
     <parent>
-        <artifactId>annotations</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>annotations</artifactId>
         <version>1.0.0-SNAPSHOT</version>
         <relativePath>../</relativePath>
     </parent>

annotations/pom.xml

@@ -7,8 +7,8 @@
     <packaging>pom</packaging>
 
     <parent>
-        <artifactId>parent-modules</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 

antlr/pom.xml

@@ -1,3 +1,4 @@
+<?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
@@ -57,4 +58,5 @@
         <antlr.version>4.7.1</antlr.version>
         <mojo.version>3.0.0</mojo.version>
     </properties>
+    
 </project>

apache-bval/pom.xml

@@ -1,7 +1,7 @@
+<?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>
-    <groupId>apache-bval</groupId>
     <artifactId>apache-bval</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <name>apache-bval</name>

apache-curator/pom.xml

@@ -1,3 +1,4 @@
+<?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>

apache-cxf/cxf-aegis/pom.xml

@@ -1,3 +1,4 @@
+<?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>

apache-cxf/cxf-introduction/pom.xml

@@ -1,5 +1,4 @@
 <?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>

apache-cxf/cxf-jaxrs-implementation/pom.xml

@@ -1,5 +1,4 @@
 <?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>

apache-cxf/cxf-spring/pom.xml

@@ -1,9 +1,10 @@
+<?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>cxf-spring</artifactId>
-    <packaging>war</packaging>
     <name>cxf-spring</name>
+    <packaging>war</packaging>
 
     <parent>
         <groupId>com.baeldung</groupId>
@@ -98,7 +99,6 @@
                 </plugins>
             </build>
         </profile>
-
     </profiles>
 
     <properties>

apache-cxf/pom.xml

@@ -1,3 +1,4 @@
+<?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>

apache-fop/pom.xml

@@ -1,3 +1,4 @@
+<?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>

apache-geode/pom.xml

@@ -24,4 +24,5 @@
     <properties>
         <geode.core>1.6.0</geode.core>
     </properties>
+
 </project>

apache-meecrowave/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -58,4 +59,5 @@
         <meecrowave-core.version>1.2.1</meecrowave-core.version>
         <meecrowave-maven-plugin.version>1.2.1</meecrowave-maven-plugin.version>
     </properties>
+
 </project>

apache-olingo/olingo2/pom.xml

@@ -9,8 +9,8 @@
     <description>Sample Olingo 2 Project</description>
 
     <parent>
-        <artifactId>parent-boot-2</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
         <version>0.0.1-SNAPSHOT</version>
         <relativePath>../../parent-boot-2</relativePath>
     </parent>

apache-poi/pom.xml

@@ -1,3 +1,4 @@
+<?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>

apache-pulsar/pom.xml

@@ -26,4 +26,5 @@
     <properties>
         <pulsar-client.version>2.1.1-incubating</pulsar-client.version>
     </properties>
+
 </project>

apache-shiro/pom.xml

@@ -8,8 +8,8 @@
     <name>apache-shiro</name>
 
     <parent>
-        <artifactId>parent-boot-1</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-1</artifactId>
         <version>0.0.1-SNAPSHOT</version>
         <relativePath>../parent-boot-1</relativePath>
     </parent>

apache-solrj/pom.xml

@@ -1,3 +1,4 @@
+<?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>

apache-spark/pom.xml

@@ -1,3 +1,4 @@
+<?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">
@@ -27,6 +28,18 @@
             <version>${org.apache.spark.spark-sql.version}</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>org.apache.spark</groupId>
+            <artifactId>spark-graphx_2.11</artifactId>
+            <version>${org.apache.spark.spark-graphx.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>graphframes</groupId>
+            <artifactId>graphframes</artifactId>
+            <version>${graphframes.version}</version>
+            <scope>provided</scope>
+        </dependency>
         <dependency>
             <groupId>org.apache.spark</groupId>
             <artifactId>spark-streaming_2.11</artifactId>
@@ -77,11 +90,20 @@
         </plugins>
     </build>
 
+    <repositories>
+        <repository>
+            <id>SparkPackagesRepo</id>
+            <url>http://dl.bintray.com/spark-packages/maven</url>
+        </repository>
+    </repositories>
+
     <properties>
         <org.apache.spark.spark-core.version>2.3.0</org.apache.spark.spark-core.version>
         <org.apache.spark.spark-sql.version>2.3.0</org.apache.spark.spark-sql.version>
         <org.apache.spark.spark-streaming.version>2.3.0</org.apache.spark.spark-streaming.version>
         <org.apache.spark.spark-mllib.version>2.3.0</org.apache.spark.spark-mllib.version>
+        <org.apache.spark.spark-graphx.version>2.3.0</org.apache.spark.spark-graphx.version>
+        <graphframes.version>0.7.0-spark2.4-s_2.11</graphframes.version>
         <org.apache.spark.spark-streaming-kafka.version>2.3.0</org.apache.spark.spark-streaming-kafka.version>
         <com.datastax.spark.spark-cassandra-connector.version>2.3.0</com.datastax.spark.spark-cassandra-connector.version>
         <com.datastax.spark.spark-cassandra-connector-java.version>1.5.2</com.datastax.spark.spark-cassandra-connector-java.version>

apache-spark/src/main/java/com/baeldung/graphframes/GraphExperiments.java

@@ -0,0 +1,52 @@
+package com.baeldung.graphframes;
+
+import org.apache.log4j.Level;
+import org.apache.log4j.Logger;
+import org.apache.spark.api.java.function.VoidFunction;
+import org.apache.spark.graphx.Edge;
+import org.apache.spark.graphx.Graph;
+import org.apache.spark.graphx.VertexRDD;
+import org.graphframes.GraphFrame;
+import scala.Tuple2;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+public class GraphExperiments {
+    public static Map<Long, User> USERS = new HashMap<>();
+
+    public static void main(String[] args) throws IOException {
+        Logger.getLogger("org").setLevel(Level.OFF);
+        GraphLoader loader = new GraphLoader();
+        GraphFrame graph = loader.getGraphFrameUserRelationship();
+
+        GraphExperiments experiments = new GraphExperiments();
+        experiments.doGraphFrameOperations(graph);
+        experiments.doGraphFrameAlgorithms(graph);
+    }
+
+    private void doGraphFrameOperations(GraphFrame graph) {
+        graph.vertices().show();
+        graph.edges().show();
+
+        graph.vertices().filter("name = 'Martin'").show();
+
+        graph.filterEdges("type = 'Friend'")
+            .dropIsolatedVertices().vertices().show();
+
+        graph.degrees().show();
+        graph.inDegrees().show();
+        graph.outDegrees().show();
+    }
+
+    private void doGraphFrameAlgorithms(GraphFrame graph) {
+
+        graph.pageRank().maxIter(20).resetProbability(0.15).run().vertices().show();
+
+        graph.connectedComponents().run().show();
+
+        graph.triangleCount().run().show();
+    }
+
+}

apache-spark/src/main/java/com/baeldung/graphframes/GraphLoader.java

@@ -0,0 +1,72 @@
+package com.baeldung.graphframes;
+
+import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.JavaSparkContext;
+import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Row;
+import org.apache.spark.sql.SparkSession;
+import org.graphframes.GraphFrame;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+public class GraphLoader {
+
+    public JavaSparkContext getSparkContext() throws IOException {
+        Path temp = Files.createTempDirectory("sparkGraphFrames");
+        SparkConf sparkConf = new SparkConf().setAppName("SparkGraphX").setMaster("local[*]");
+        JavaSparkContext javaSparkContext = new JavaSparkContext(sparkConf);
+        javaSparkContext.setCheckpointDir(temp.toString());
+        return javaSparkContext;
+    }
+
+    public GraphFrame getGraphFrameUserRelationship() throws IOException {
+        Path temp = Files.createTempDirectory("sparkGraphFrames");
+        SparkSession session = SparkSession.builder()
+            .appName("SparkGraphFrameSample")
+            .config("spark.sql.warehouse.dir", temp.toString())
+            .sparkContext(getSparkContext().sc())
+            .master("local[*]")
+            .getOrCreate();
+        List<User> users = loadUsers();
+
+        Dataset<Row> userDataset = session.createDataFrame(users, User.class);
+
+        List<Relationship> relationshipsList = getRelations();
+        Dataset<Row> relationshipDataset = session.createDataFrame(relationshipsList, Relationship.class);
+
+        GraphFrame graphFrame = new GraphFrame(userDataset, relationshipDataset);
+
+        return graphFrame;
+    }
+
+    public List<Relationship> getRelations() {
+        List<Relationship> relationships = new ArrayList<>();
+        relationships.add(new Relationship("Friend", "1", "2"));
+        relationships.add(new Relationship("Following", "1", "4"));
+        relationships.add(new Relationship("Friend", "2", "4"));
+        relationships.add(new Relationship("Relative", "3", "1"));
+        relationships.add(new Relationship("Relative", "3", "4"));
+
+        return relationships;
+    }
+
+    private List<User> loadUsers() {
+        User john = new User(1L, "John");
+        User martin = new User(2L, "Martin");
+        User peter = new User(3L, "Peter");
+        User alicia = new User(4L, "Alicia");
+
+        List<User> users = new ArrayList<>();
+
+        users.add(new User(1L, "John"));
+        users.add(new User(2L, "Martin"));
+        users.add(new User(3L, "Peter"));
+        users.add(new User(4L, "Alicia"));
+
+        return users;
+    }
+}

apache-spark/src/main/java/com/baeldung/graphframes/Relationship.java

@@ -0,0 +1,39 @@
+package com.baeldung.graphframes;
+
+import java.io.Serializable;
+import java.util.UUID;
+
+public class Relationship implements Serializable {
+    private String type;
+    private String src;
+    private String dst;
+    private UUID id;
+
+    public Relationship(String type, String src, String dst) {
+        this.type = type;
+        this.src = src;
+        this.dst = dst;
+        this.id = UUID.randomUUID();
+    }
+
+    public String getId() {
+        return id.toString();
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public String getSrc() {
+        return src;
+    }
+
+    public String getDst() {
+        return dst;
+    }
+    
+    @Override
+    public String toString() {
+    	return getSrc() + " -- " + getType() + " --> " + getDst();
+    }
+}

apache-spark/src/main/java/com/baeldung/graphframes/User.java

@@ -0,0 +1,27 @@
+package com.baeldung.graphframes;
+
+import java.io.Serializable;
+
+public class User implements Serializable {
+
+    private Long id;
+    private String name;
+
+    public User(long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public String getId() {
+        return id.toString();
+    }
+
+    public String getName() {
+        return name;
+    }
+    
+    @Override
+    public String toString() {
+        return "<" + id + "," + name + ">";
+    }
+}

apache-tapestry/pom.xml

@@ -1,11 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung</groupId>
     <artifactId>apache-tapestry</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-    <packaging>war</packaging>
     <name>apache-tapestry</name>
+    <packaging>war</packaging>
+
     <dependencies>
         <!-- To set up an application with a database, change the artifactId below to
              tapestry-hibernate, and add a dependency on your JDBC driver. You'll also
@@ -71,8 +73,8 @@ of testing facilities designed for use with TestNG (http://testng.org/), so it's
             <version>${tapestry-release-version}</version>
             <scope>provided</scope>
         </dependency>
-
     </dependencies>
+
     <build>
         <finalName>apache-tapestry</finalName>
         <plugins>
@@ -142,6 +144,6 @@ of testing facilities designed for use with TestNG (http://testng.org/), so it's
         <servlet-api-release-version>2.5</servlet-api-release-version>
         <testng-release-version>6.8.21</testng-release-version>
         <slf4j-release-version>1.7.19</slf4j-release-version>
-
     </properties>
+
 </project>

apache-thrift/pom.xml

@@ -1,3 +1,4 @@
+<?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>

apache-tika/pom.xml

@@ -1,3 +1,4 @@
+<?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>

apache-velocity/pom.xml

@@ -1,8 +1,9 @@
+<?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <version>0.1-SNAPSHOT</version>
     <artifactId>apache-velocity</artifactId>
+    <version>0.1-SNAPSHOT</version>
     <name>apache-velocity</name>
     <packaging>war</packaging>
 

apache-zookeeper/pom.xml

@@ -1,3 +1,4 @@
+<?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>

asciidoctor/pom.xml

@@ -6,8 +6,8 @@
     <name>asciidoctor</name>
 
     <parent>
-        <artifactId>parent-modules</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
@@ -63,7 +63,6 @@
     <properties>
         <asciidoctor-maven-plugin.version>1.5.6</asciidoctor-maven-plugin.version>
         <asciidoctorj.version>1.5.6</asciidoctorj.version>
-        
         <asciidoctorj-pdf.version>1.5.0-alpha.15</asciidoctorj-pdf.version>
         <asciidoctorj-pdf.plugin.version>1.5.0-alpha.15</asciidoctorj-pdf.plugin.version>
     </properties>

atomix/pom.xml

@@ -1,3 +1,4 @@
+<?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>

aws-lambda/pom.xml

@@ -8,13 +8,12 @@
     <packaging>jar</packaging>
 
     <parent>
-        <artifactId>parent-modules</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
     <dependencies>
-
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-java-sdk-dynamodb</artifactId>

aws-reactive/images/rective-upload.txt

@@ -0,0 +1,29 @@
+participant "Client 1" as C1
+participant "Client 2" as C2
+participant "Reactive Web App" as RWS
+participant "Backend" as S3
+C1 -> RWS: POST
+activate C1
+activate RWS
+RWS -> S3: Async POST
+deactivate RWS
+C2 -> RWS: POST
+activate C2
+activate RWS
+RWS -> S3: Async POST
+deactivate RWS
+S3 --> RWS: Async Result
+activate RWS
+RWS -->C2: Result
+deactivate RWS
+deactivate C2
+// First file EOF
+S3 --> RWS: Async Result
+activate RWS
+RWS -->C1: Result
+deactivate RWS
+deactivate C1
+
+
+
+

aws-reactive/images/thread-per-client.txt

@@ -0,0 +1,28 @@
+participant Client 1
+participant Client 2
+participant Controller
+participant Backend
+Client 1-> Controller: POST Data
+activate Client 1
+activate Controller
+Controller -> Backend: Save Data
+activate Backend
+note left of Controller #yellow: Controller blocked\nuntil result received
+Backend --> Controller: Result
+deactivate Backend
+Controller --> Client 1: Result
+deactivate Client 1
+deactivate Controller
+// 2nd Upload
+Client 2-> Controller: POST Data
+activate Client 2
+activate Controller
+Controller -> Backend: Save Data
+activate Backend
+note left of Controller #yellow: Controller blocket\nuntil result received
+Backend --> Controller: Result
+deactivate Backend
+Controller --> Client 2: Result
+deactivate Controller
+deactivate Client 2
+

aws-reactive/pom.xml

@@ -0,0 +1,105 @@
+<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+	
+	<artifactId>aws-reactive</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>aws-reactive</name>
+	<description>AWS Reactive Sample</description>
+
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencyManagement>
+		<dependencies>
+
+			<dependency>
+				<!-- Import dependency management from Spring Boot -->
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-dependencies</artifactId>
+				<version>2.2.1.RELEASE</version>
+				<type>pom</type>
+				<scope>import</scope>
+			</dependency>
+
+			<dependency>
+				<groupId>software.amazon.awssdk</groupId>
+				<artifactId>bom</artifactId>
+				<version>2.10.27</version>
+				<type>pom</type>
+				<scope>import</scope>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-webflux</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>software.amazon.awssdk</groupId>
+			<artifactId>s3</artifactId>
+			<scope>compile</scope>
+		</dependency>
+
+		<dependency>
+			<artifactId>netty-nio-client</artifactId>
+			<groupId>software.amazon.awssdk</groupId>
+			<scope>compile</scope>
+		</dependency>
+
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.junit.vintage</groupId>
+					<artifactId>junit-vintage-engine</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+
+
+		<dependency>
+			<groupId>io.projectreactor</groupId>
+			<artifactId>reactor-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-devtools</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-configuration-processor</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

aws-reactive/src/main/java/com/baeldung/aws/reactive/s3/DownloadFailedException.java

@@ -0,0 +1,32 @@
+package com.baeldung.aws.reactive.s3;
+
+import java.util.Optional;
+
+import org.springframework.http.HttpStatus;
+
+import lombok.AllArgsConstructor;
+import software.amazon.awssdk.core.SdkResponse;
+import software.amazon.awssdk.http.SdkHttpResponse;
+
+@AllArgsConstructor
+public class DownloadFailedException extends RuntimeException {
+
+    private static final long serialVersionUID = 1L;
+
+    private int statusCode;
+    private Optional<String> statusText;
+
+    public DownloadFailedException(SdkResponse response) {
+
+        SdkHttpResponse httpResponse = response.sdkHttpResponse();
+        if (httpResponse != null) {
+            this.statusCode = httpResponse.statusCode();
+            this.statusText = httpResponse.statusText();
+        } else {
+            this.statusCode = HttpStatus.INTERNAL_SERVER_ERROR.value();
+            this.statusText = Optional.of("UNKNOWN");
+        }
+
+    }
+
+}

aws-reactive/src/main/java/com/baeldung/aws/reactive/s3/DownloadResource.java

@@ -0,0 +1,144 @@
+/**
+ * 
+ */
+package com.baeldung.aws.reactive.s3;
+
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.concurrent.CompletableFuture;
+
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DataBufferUtils;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.ResponseEntity.BodyBuilder;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import lombok.extern.slf4j.Slf4j;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import software.amazon.awssdk.core.ResponseBytes;
+import software.amazon.awssdk.core.SdkResponse;
+import software.amazon.awssdk.core.async.AsyncResponseTransformer;
+import software.amazon.awssdk.core.async.SdkPublisher;
+import software.amazon.awssdk.core.internal.async.ByteArrayAsyncResponseTransformer;
+import software.amazon.awssdk.http.SdkHttpResponse;
+import software.amazon.awssdk.services.s3.S3AsyncClient;
+import software.amazon.awssdk.services.s3.model.GetObjectRequest;
+import software.amazon.awssdk.services.s3.model.GetObjectResponse;
+
+/**
+ * @author Philippe
+ *
+ */
+@RestController
+@RequestMapping("/inbox")
+@Slf4j
+public class DownloadResource {
+    
+    
+    private final S3AsyncClient s3client;
+    private final S3ClientConfigurarionProperties s3config;
+
+    public DownloadResource(S3AsyncClient s3client, S3ClientConfigurarionProperties s3config) {
+        this.s3client = s3client;
+        this.s3config = s3config;        
+    }
+    
+    
+    @GetMapping(path="/{filekey}")
+    public Mono<ResponseEntity<Flux<ByteBuffer>>> downloadFile(@PathVariable("filekey") String filekey) {
+        
+        GetObjectRequest request = GetObjectRequest.builder()
+          .bucket(s3config.getBucket())
+          .key(filekey)
+          .build();
+        
+        return Mono.fromFuture(s3client.getObject(request,new FluxResponseProvider()))
+          .map( (response) -> {
+            checkResult(response.sdkResponse);
+            String filename = getMetadataItem(response.sdkResponse,"filename",filekey);            
+
+            log.info("[I65] filename={}, length={}",filename, response.sdkResponse.contentLength() );
+            
+            return ResponseEntity.ok()
+              .header(HttpHeaders.CONTENT_TYPE, response.sdkResponse.contentType())
+              .header(HttpHeaders.CONTENT_LENGTH, Long.toString(response.sdkResponse.contentLength()))
+              .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + filename + "\"")
+              .body(response.flux);
+          });
+    }
+
+    /**
+     * Lookup a metadata key in a case-insensitive way.
+     * @param sdkResponse
+     * @param key
+     * @param defaultValue
+     * @return
+     */
+    private String getMetadataItem(GetObjectResponse sdkResponse, String key, String defaultValue) {
+        for( Entry<String, String> entry : sdkResponse.metadata().entrySet()) {
+            if ( entry.getKey().equalsIgnoreCase(key)) {
+                return entry.getValue();
+            }
+        }
+        return defaultValue;
+    }
+
+
+    // Helper used to check return codes from an API call
+    private static void checkResult(GetObjectResponse response) {
+        SdkHttpResponse sdkResponse = response.sdkHttpResponse();
+        if ( sdkResponse != null && sdkResponse.isSuccessful()) {
+            return;
+        }
+        
+        throw new DownloadFailedException(response);
+    }
+    
+    
+    static class FluxResponseProvider implements AsyncResponseTransformer<GetObjectResponse,FluxResponse> {
+        
+        private FluxResponse response;
+
+        @Override
+        public CompletableFuture<FluxResponse> prepare() {
+            response = new FluxResponse();
+            return response.cf;
+        }
+
+        @Override
+        public void onResponse(GetObjectResponse sdkResponse) {            
+            this.response.sdkResponse = sdkResponse;
+        }
+
+        @Override
+        public void onStream(SdkPublisher<ByteBuffer> publisher) {
+            response.flux = Flux.from(publisher);
+            response.cf.complete(response);            
+        }
+
+        @Override
+        public void exceptionOccurred(Throwable error) {
+            response.cf.completeExceptionally(error);
+        }
+        
+    }
+    
+    /**
+     * Holds the API response and stream
+     * @author Philippe
+     */
+    static class FluxResponse {
+        
+        final CompletableFuture<FluxResponse> cf = new CompletableFuture<>();
+        GetObjectResponse sdkResponse;
+        Flux<ByteBuffer> flux;
+    }
+
+}

aws-reactive/src/main/java/com/baeldung/aws/reactive/s3/ReactiveS3Application.java

@@ -0,0 +1,13 @@
+package com.baeldung.aws.reactive.s3;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class ReactiveS3Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ReactiveS3Application.class, args);
+    }
+
+}

aws-reactive/src/main/java/com/baeldung/aws/reactive/s3/S3ClientConfigurarionProperties.java

@@ -0,0 +1,28 @@
+package com.baeldung.aws.reactive.s3;
+
+import java.net.URI;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import lombok.Data;
+import software.amazon.awssdk.regions.Region;
+
+@ConfigurationProperties(prefix = "aws.s3")
+@Data
+public class S3ClientConfigurarionProperties {
+
+    private Region region = Region.US_EAST_1;
+    private URI endpoint = null;
+
+    private     String accessKeyId;
+    private String secretAccessKey;
+    
+    // Bucket name we'll be using as our backend storage
+    private String bucket;
+
+    // AWS S3 requires that file parts must have at least 5MB, except
+    // for the last part. This may change for other S3-compatible services, so let't
+    // define a configuration property for that
+    private int multipartMinPartSize = 5*1024*1024;
+
+}

aws-reactive/src/main/java/com/baeldung/aws/reactive/s3/S3ClientConfiguration.java

@@ -0,0 +1,65 @@
+package com.baeldung.aws.reactive.s3;
+
+import java.time.Duration;
+
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
+import software.amazon.awssdk.auth.credentials.AwsCredentials;
+import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
+import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
+import software.amazon.awssdk.http.async.SdkAsyncHttpClient;
+import software.amazon.awssdk.http.nio.netty.NettyNioAsyncHttpClient;
+import software.amazon.awssdk.services.s3.S3AsyncClient;
+import software.amazon.awssdk.services.s3.S3AsyncClientBuilder;
+import software.amazon.awssdk.services.s3.S3Configuration;
+import software.amazon.awssdk.utils.StringUtils;
+
+@Configuration
+@EnableConfigurationProperties(S3ClientConfigurarionProperties.class)
+public class S3ClientConfiguration {
+
+    @Bean
+    public S3AsyncClient s3client(S3ClientConfigurarionProperties s3props, AwsCredentialsProvider credentialsProvider) {
+
+        SdkAsyncHttpClient httpClient = NettyNioAsyncHttpClient.builder()
+            .writeTimeout(Duration.ZERO)
+            .maxConcurrency(64)
+            .build();
+
+        S3Configuration serviceConfiguration = S3Configuration.builder()
+            .checksumValidationEnabled(false)
+            .chunkedEncodingEnabled(true)
+            .build();
+
+        S3AsyncClientBuilder b = S3AsyncClient.builder()
+            .httpClient(httpClient)
+            .region(s3props.getRegion())
+            .credentialsProvider(credentialsProvider)
+            .serviceConfiguration(serviceConfiguration);
+
+        if (s3props.getEndpoint() != null) {
+            b = b.endpointOverride(s3props.getEndpoint());
+        }
+
+        return b.build();
+    }
+
+    @Bean
+    public AwsCredentialsProvider awsCredentialsProvider(S3ClientConfigurarionProperties s3props) {
+
+        if (StringUtils.isBlank(s3props.getAccessKeyId())) {
+            // Return default provider
+            return DefaultCredentialsProvider.create();
+        } 
+        else {
+            // Return custom credentials provider
+            return () -> {
+                AwsCredentials creds = AwsBasicCredentials.create(s3props.getAccessKeyId(), s3props.getSecretAccessKey());
+                return creds;
+            };
+        }
+    }
+}

aws-reactive/src/main/java/com/baeldung/aws/reactive/s3/UploadFailedException.java

@@ -0,0 +1,32 @@
+package com.baeldung.aws.reactive.s3;
+
+import java.util.Optional;
+
+import org.springframework.http.HttpStatus;
+
+import lombok.AllArgsConstructor;
+import software.amazon.awssdk.core.SdkResponse;
+import software.amazon.awssdk.http.SdkHttpResponse;
+
+@AllArgsConstructor
+public class UploadFailedException extends RuntimeException {
+
+    private static final long serialVersionUID = 1L;
+
+    private int statusCode;
+    private Optional<String> statusText;
+
+    public UploadFailedException(SdkResponse response) {
+
+        SdkHttpResponse httpResponse = response.sdkHttpResponse();
+        if (httpResponse != null) {
+            this.statusCode = httpResponse.statusCode();
+            this.statusText = httpResponse.statusText();
+        } else {
+            this.statusCode = HttpStatus.INTERNAL_SERVER_ERROR.value();
+            this.statusText = Optional.of("UNKNOWN");
+        }
+
+    }
+
+}

aws-reactive/src/main/java/com/baeldung/aws/reactive/s3/UploadResource.java

@@ -0,0 +1,308 @@
+/**
+ * 
+ */
+package com.baeldung.aws.reactive.s3;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.Collector;
+import java.util.stream.Collectors;
+
+import org.reactivestreams.Publisher;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.codec.multipart.FilePart;
+import org.springframework.http.codec.multipart.Part;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+import lombok.Data;
+import lombok.extern.slf4j.Slf4j;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import software.amazon.awssdk.core.SdkResponse;
+import software.amazon.awssdk.core.async.AsyncRequestBody;
+import software.amazon.awssdk.services.s3.S3AsyncClient;
+import software.amazon.awssdk.services.s3.model.CompleteMultipartUploadRequest;
+import software.amazon.awssdk.services.s3.model.CompleteMultipartUploadResponse;
+import software.amazon.awssdk.services.s3.model.CompletedMultipartUpload;
+import software.amazon.awssdk.services.s3.model.CompletedMultipartUpload.Builder;
+import software.amazon.awssdk.services.s3.model.CompletedPart;
+import software.amazon.awssdk.services.s3.model.CreateMultipartUploadRequest;
+import software.amazon.awssdk.services.s3.model.CreateMultipartUploadResponse;
+import software.amazon.awssdk.services.s3.model.PutObjectRequest;
+import software.amazon.awssdk.services.s3.model.PutObjectResponse;
+import software.amazon.awssdk.services.s3.model.UploadPartRequest;
+import software.amazon.awssdk.services.s3.model.UploadPartResponse;
+
+/**
+ * @author Philippe
+ *
+ */
+@RestController
+@RequestMapping("/inbox")
+@Slf4j
+public class UploadResource {
+
+    private final S3AsyncClient s3client;
+    private final S3ClientConfigurarionProperties s3config;
+
+    public UploadResource(S3AsyncClient s3client, S3ClientConfigurarionProperties s3config) {
+        this.s3client = s3client;
+        this.s3config = s3config;        
+    }
+    
+    /**
+     *  Standard file upload.
+     */
+    @PostMapping
+    public Mono<ResponseEntity<UploadResult>> uploadHandler(@RequestHeader HttpHeaders headers, @RequestBody Flux<ByteBuffer> body) {
+
+        long length = headers.getContentLength();
+        if (length < 0) {
+            throw new UploadFailedException(HttpStatus.BAD_REQUEST.value(), Optional.of("required header missing: Content-Length"));
+        }
+
+        String fileKey = UUID.randomUUID().toString();
+        Map<String, String> metadata = new HashMap<String, String>();
+        MediaType mediaType = headers.getContentType();
+
+        if (mediaType == null) {
+            mediaType = MediaType.APPLICATION_OCTET_STREAM;
+        }
+
+        log.info("[I95] uploadHandler: mediaType{}, length={}", mediaType, length);
+        CompletableFuture<PutObjectResponse> future = s3client
+          .putObject(PutObjectRequest.builder()
+            .bucket(s3config.getBucket())
+            .contentLength(length)
+            .key(fileKey.toString())
+            .contentType(mediaType.toString())
+            .metadata(metadata)
+            .build(), 
+            AsyncRequestBody.fromPublisher(body));
+        
+        return Mono.fromFuture(future)
+          .map((response) -> {
+              checkResult(response);
+              return ResponseEntity
+                .status(HttpStatus.CREATED)
+                .body(new UploadResult(HttpStatus.CREATED, new String[] {fileKey}));
+          });
+    }
+    
+
+    /**
+     * Multipart file upload
+     * @param bucket
+     * @param parts
+     * @param headers
+     * @return
+     */
+    @RequestMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE, method = {RequestMethod.POST, RequestMethod.PUT})
+    public Mono<ResponseEntity<UploadResult>> multipartUploadHandler(@RequestHeader HttpHeaders headers, @RequestBody Flux<Part> parts  ) {
+                
+        return parts
+          .ofType(FilePart.class) // We'll ignore other data for now
+          .flatMap((part) -> saveFile(headers, s3config.getBucket(), part))
+          .collect(Collectors.toList())
+          .map((keys) -> ResponseEntity.status(HttpStatus.CREATED)
+            .body(new UploadResult(HttpStatus.CREATED,keys)));
+    }
+
+
+    /**
+     * Save file using a multipart upload. This method does not require any temporary
+     * storage at the REST service
+     * @param headers 
+     * @param bucket Bucket name
+     * @param part Uploaded file
+     * @return
+     */
+    protected Mono<String> saveFile(HttpHeaders headers,String bucket, FilePart part) {
+
+        // Generate a filekey for this upload
+        String filekey = UUID.randomUUID().toString();
+        
+        log.info("[I137] saveFile: filekey={}, filename={}", filekey, part.filename());
+        
+        // Gather metadata
+        Map<String, String> metadata = new HashMap<String, String>();
+        String filename = part.filename();
+        if ( filename == null ) {
+            filename = filekey;
+        }
+           
+        metadata.put("filename", filename);
+        
+        MediaType mt = part.headers().getContentType();
+        if ( mt == null ) {
+            mt = MediaType.APPLICATION_OCTET_STREAM;
+        }
+        
+        // Create multipart upload request
+        CompletableFuture<CreateMultipartUploadResponse> uploadRequest = s3client
+          .createMultipartUpload(CreateMultipartUploadRequest.builder()
+            .contentType(mt.toString())
+            .key(filekey)
+            .metadata(metadata)
+            .bucket(bucket)
+            .build());
+
+        // This variable will hold the upload state that we must keep
+        // around until all uploads complete
+        final UploadState uploadState = new UploadState(bucket,filekey);
+
+        return Mono
+          .fromFuture(uploadRequest)
+          .flatMapMany((response) -> {
+              checkResult(response);              
+              uploadState.uploadId = response.uploadId();
+              log.info("[I183] uploadId={}", response.uploadId());
+              return part.content();
+          })
+          .bufferUntil((buffer) -> {
+              uploadState.buffered += buffer.readableByteCount();
+              if ( uploadState.buffered >= s3config.getMultipartMinPartSize() ) {
+                  log.info("[I173] bufferUntil: returning true, bufferedBytes={}, partCounter={}, uploadId={}", uploadState.buffered, uploadState.partCounter, uploadState.uploadId);
+                  uploadState.buffered = 0;
+                  return true;
+              }
+              else {
+                  return false;
+              }
+          })
+          .map((buffers) -> concatBuffers(buffers))
+          .flatMap((buffer) -> uploadPart(uploadState,buffer))
+          .onBackpressureBuffer()
+          .reduce(uploadState,(state,completedPart) -> {
+              log.info("[I188] completed: partNumber={}, etag={}", completedPart.partNumber(), completedPart.eTag());
+              state.completedParts.put(completedPart.partNumber(), completedPart);              
+              return state;
+          })
+          .flatMap((state) -> completeUpload(state))
+          .map((response) -> {
+              checkResult(response);
+              return  uploadState.filekey;
+          });
+    }
+    
+    private static ByteBuffer concatBuffers(List<DataBuffer> buffers) {
+        log.info("[I198] creating BytBuffer from {} chunks", buffers.size());
+        
+        int partSize = 0;
+        for( DataBuffer b : buffers) {
+            partSize += b.readableByteCount();                  
+        }
+        
+        ByteBuffer partData = ByteBuffer.allocate(partSize);
+        buffers.forEach((buffer) -> {
+           partData.put(buffer.asByteBuffer());
+        });
+        
+        // Reset read pointer to first byte
+        partData.rewind();
+        
+        log.info("[I208] partData: size={}", partData.capacity());
+        return partData;
+        
+    }
+
+    /**
+     * Upload a single file part to the requested bucket
+     * @param uploadState
+     * @param buffer
+     * @return
+     */
+    private Mono<CompletedPart> uploadPart(UploadState uploadState, ByteBuffer buffer) {
+        final int partNumber = ++uploadState.partCounter;
+        log.info("[I218] uploadPart: partNumber={}, contentLength={}",partNumber, buffer.capacity());
+
+        CompletableFuture<UploadPartResponse> request = s3client.uploadPart(UploadPartRequest.builder()
+            .bucket(uploadState.bucket)
+            .key(uploadState.filekey)
+            .partNumber(partNumber)
+            .uploadId(uploadState.uploadId)
+            .contentLength((long) buffer.capacity())
+            .build(), 
+            AsyncRequestBody.fromPublisher(Mono.just(buffer)));
+        
+        return Mono
+          .fromFuture(request)
+          .map((uploadPartResult) -> {              
+              checkResult(uploadPartResult);
+              log.info("[I230] uploadPart complete: part={}, etag={}",partNumber,uploadPartResult.eTag());
+              return CompletedPart.builder()
+                .eTag(uploadPartResult.eTag())
+                .partNumber(partNumber)
+                .build();
+          });
+    }
+    
+    private Mono<CompleteMultipartUploadResponse> completeUpload(UploadState state) {        
+        log.info("[I202] completeUpload: bucket={}, filekey={}, completedParts.size={}", state.bucket, state.filekey, state.completedParts.size());        
+
+        CompletedMultipartUpload multipartUpload = CompletedMultipartUpload.builder()
+            .parts(state.completedParts.values())
+            .build();
+
+        return Mono.fromFuture(s3client.completeMultipartUpload(CompleteMultipartUploadRequest.builder()
+            .bucket(state.bucket)
+            .uploadId(state.uploadId)
+            .multipartUpload(multipartUpload)
+            .key(state.filekey)
+            .build()));
+    }
+    
+
+    /**
+     * check result from an API call.
+     * @param result Result from an API call
+     */
+    private static void checkResult(SdkResponse result) {
+        if (result.sdkHttpResponse() == null || !result.sdkHttpResponse().isSuccessful()) {
+            throw new UploadFailedException(result);
+        }        
+    }
+
+
+    /**
+     * Holds upload state during a multipart upload
+     */
+    static class UploadState {
+        final String bucket;
+        final String filekey;
+
+        String uploadId;
+        int partCounter;
+        Map<Integer, CompletedPart> completedParts = new HashMap<>();
+        int buffered = 0;
+
+        UploadState(String bucket, String filekey) {
+            this.bucket = bucket;
+            this.filekey = filekey;
+        }
+    }
+
+}

aws-reactive/src/main/java/com/baeldung/aws/reactive/s3/UploadResult.java

@@ -0,0 +1,25 @@
+package com.baeldung.aws.reactive.s3;
+
+import java.util.List;
+
+import org.springframework.http.HttpStatus;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+@Builder
+public class UploadResult {
+    HttpStatus status;
+    String[] keys;
+
+    public UploadResult() {}
+    
+    public UploadResult(HttpStatus status, List<String> keys) {
+        this.status = status;
+        this.keys = keys == null ? new String[] {}: keys.toArray(new String[] {});
+
+    }
+}

aws-reactive/src/main/resources/application-minio.yml

@@ -0,0 +1,15 @@
+
+#
+# Minio profile
+#
+aws:
+  s3:
+    region: sa-east-1
+    endpoint: http://localhost:9000
+    accessKeyId: 8KLF8U60JER4AP23H0A6
+    secretAccessKey: vX4uM7e7nNGPqjcXycVVhceNR7NQkiMQkR9Hoctf
+    bucket: bucket1
+
+  
+    
+    

aws-reactive/src/main/resources/application.yml

@@ -0,0 +1,16 @@
+
+#
+# Configurações de acesso ao Minio
+#
+aws:
+  s3:
+    region: sa-east-1
+# When using AWS, the library will use one of the available
+# credential sources described in the documentation.     
+#    accessKeyId: ****
+#    secretAccessKey: ****
+    bucket: dev1.token.com.br
+    
+    
+    
+    

aws-reactive/src/test/java/com/baeldung/aws/reactive/s3/ReactiveS3ApplicationLiveTest.java

@@ -0,0 +1,85 @@
+package com.baeldung.aws.reactive.s3;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.core.io.Resource;
+import org.springframework.http.ContentDisposition;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+import org.springframework.util.ResourceUtils;
+
+import static org.junit.Assert.*;
+
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
+@ActiveProfiles("minio")
+class ReactiveS3ApplicationLiveTest {
+    
+    @Autowired
+    private TestRestTemplate restTemplate;
+    
+    @LocalServerPort
+    private int serverPort;
+    
+
+    @Test
+    void whenUploadSingleFile_thenSuccess() throws Exception {
+        
+        String url = "http://localhost:" + serverPort + "/inbox";        
+        byte[] data = Files.readAllBytes(Paths.get("src/test/resources/testimage1.png"));         
+        UploadResult result = restTemplate.postForObject(url, data , UploadResult.class);
+        
+        assertEquals("Expected CREATED (202)", result.getStatus(), HttpStatus.CREATED );
+        
+    }
+    
+    @Test
+    void whenUploadMultipleFiles_thenSuccess() throws Exception {
+        
+        
+        MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
+        addFileEntity("f1", body, new File("src/test/resources/testimage1.png"));
+        addFileEntity("f2", body, new File("src/test/resources/testimage2.png"));
+        
+        HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body);
+        String url = "http://localhost:" + serverPort + "/inbox";        
+        
+        ResponseEntity<UploadResult> result = restTemplate.postForEntity(url, requestEntity, UploadResult.class);
+
+        assertEquals("Http Code",HttpStatus.CREATED, result.getStatusCode() );
+        assertEquals("File keys",2, result.getBody().getKeys().length);
+        
+    }
+
+    private void addFileEntity(String name, MultiValueMap<String, Object> body, File file) throws Exception {
+
+        byte[] data = Files.readAllBytes(file.toPath());
+        MultiValueMap<String, String> headers = new LinkedMultiValueMap<>();
+        ContentDisposition contentDispositionHeader = ContentDisposition.builder("form-data")
+          .name(name)
+          .filename(file.getName())
+          .build();
+        
+        headers.add(HttpHeaders.CONTENT_DISPOSITION, contentDispositionHeader.toString());
+        
+        HttpEntity<byte[]> fileEntity = new HttpEntity<>(data, headers);
+        body.add(name, fileEntity);
+    }
+
+    
+}

aws/pom.xml

@@ -1,3 +1,4 @@
+<?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>

azure/pom.xml

@@ -5,12 +5,12 @@
     <artifactId>azure</artifactId>
     <version>0.1</version>
     <name>azure</name>
-    <description>Demo project for Spring Boot on Azure</description>
     <packaging>war</packaging>
+    <description>Demo project for Spring Boot on Azure</description>
 
     <parent>
-        <artifactId>parent-boot-2</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
         <version>0.0.1-SNAPSHOT</version>
         <relativePath>../parent-boot-2</relativePath>
     </parent>
@@ -43,7 +43,6 @@
             <artifactId>mysql-connector-java</artifactId>
             <scope>runtime</scope>
         </dependency>
-
     </dependencies>
 
     <build>

bazel/bazelapp/pom.xml

@@ -7,8 +7,8 @@
     <name>bazelapp</name>
 
     <parent>
-        <artifactId>bazel</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>bazel</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 

bazel/bazelgreeting/pom.xml

@@ -7,10 +7,9 @@
     <name>bazelgreeting</name>
 
     <parent>
-        <artifactId>bazel</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>bazel</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-
 </project>

bazel/pom.xml

@@ -4,12 +4,12 @@
          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>bazel</artifactId>
-    <packaging>pom</packaging>
     <name>bazel</name>
+    <packaging>pom</packaging>
 
     <parent>
-        <artifactId>parent-modules</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
@@ -18,5 +18,4 @@
         <module>bazelapp</module>
     </modules>
 
-
 </project>

blade/pom.xml

@@ -1,7 +1,7 @@
+<?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/maven-v4_0_0.xsd">
-
     <modelVersion>4.0.0</modelVersion>
     <artifactId>blade</artifactId>
     <name>blade</name>
@@ -65,8 +65,9 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
+
     <build>
-        <finalName>sample-blade-app</finalName>
+        <finalName>blade</finalName>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -121,7 +122,6 @@
                 </executions>
             </plugin>
 
-
             <plugin>
                 <artifactId>maven-assembly-plugin</artifactId>
                 <version>3.1.0</version>
@@ -162,4 +162,5 @@
         <maven-failsafe-plugin.version>3.0.0-M3</maven-failsafe-plugin.version>
         <process-exec-maven-plugin.version>0.7</process-exec-maven-plugin.version>
     </properties>
+
 </project>

bootique/pom.xml

@@ -1,3 +1,4 @@
+<?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>

cas/cas-secured-app/pom.xml

@@ -4,12 +4,12 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>cas-secured-app</artifactId>
     <name>cas-secured-app</name>
-    <description>Demo project for CAS</description>
     <packaging>jar</packaging>
+    <description>Demo project for CAS</description>
 
     <parent>
-        <artifactId>parent-boot-1</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-1</artifactId>
         <version>0.0.1-SNAPSHOT</version>
         <relativePath>../../parent-boot-1</relativePath>
     </parent>

cas/cas-server/pom.xml

@@ -8,8 +8,8 @@
     <packaging>war</packaging>
 
     <parent>
-        <artifactId>parent-boot-1</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-1</artifactId>
         <version>0.0.1-SNAPSHOT</version>
         <relativePath>../../parent-boot-1</relativePath>
     </parent>

cdi/pom.xml

@@ -61,4 +61,5 @@
         <assertj-core.version>3.10.0</assertj-core.version>
         <spring.version>5.1.2.RELEASE</spring.version>
     </properties>
+
 </project>

checker-plugin/pom.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>

cloud-foundry-uaa/cf-uaa-oauth2-client/pom.xml

@@ -8,8 +8,8 @@
     <description>Demo project for Spring Boot</description>
 
     <parent>
-        <artifactId>parent-boot-2</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
         <version>0.0.1-SNAPSHOT</version>
         <relativePath>../../parent-boot-2</relativePath>
     </parent>

cloud-foundry-uaa/cf-uaa-oauth2-resource-server/pom.xml

@@ -8,8 +8,8 @@
     <description>Demo project for Spring Boot</description>
 
     <parent>
-        <artifactId>parent-boot-2</artifactId>
         <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
         <version>0.0.1-SNAPSHOT</version>
         <relativePath>../../parent-boot-2</relativePath>
     </parent>

code-generation/pom.xml

@@ -1,3 +1,4 @@
+<?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>

core-groovy-2/pom.xml

@@ -184,5 +184,6 @@
         <logback.version>1.2.3</logback.version>
         <groovy.version>2.5.7</groovy.version>
     </properties>
+
 </project>
 

core-groovy-collections/pom.xml

@@ -127,5 +127,6 @@
         <spock-core.version>1.1-groovy-2.4</spock-core.version>
         <gmavenplus-plugin.version>1.6</gmavenplus-plugin.version>
     </properties>
+
 </project>
 

core-groovy/pom.xml

@@ -116,5 +116,6 @@
         <spock-core.version>1.1-groovy-2.4</spock-core.version>
         <gmavenplus-plugin.version>1.6</gmavenplus-plugin.version>
     </properties>
+
 </project>
 

core-java-modules/core-java-10/pom.xml

@@ -1,7 +1,7 @@
+<?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>
-    <groupId>com.baeldung</groupId>
     <artifactId>core-java-10</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-10</name>

core-java-modules/core-java-11/pom.xml

@@ -1,9 +1,8 @@
-<project
+<?xml version="1.0" encoding="UTF-8"?>
-        xmlns="http://maven.apache.org/POM/4.0.0"
+<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>
-    <groupId>com.baeldung</groupId>
     <artifactId>core-java-11</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-11</name>
@@ -110,4 +109,5 @@
         <uberjar.name>benchmarks</uberjar.name>
         <jmh.version>1.22</jmh.version>
     </properties>
+
 </project>

core-java-modules/core-java-12/pom.xml

@@ -3,7 +3,6 @@
          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>
-    <groupId>com.baeldung</groupId>
     <artifactId>core-java-12</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-12</name>

core-java-modules/core-java-8-2/README.md

@@ -3,7 +3,7 @@
 This module contains articles about Java 8 core features
 
 ### Relevant Articles: 
-- [Anonymous Classes in Java](http://www.baeldung.com/)
+- [Anonymous Classes in Java](https://www.baeldung.com/java-anonymous-classes)
 - [How to Delay Code Execution in Java](https://www.baeldung.com/java-delay-code-execution)
 - [Run a Java Application from the Command Line](https://www.baeldung.com/java-run-jar-with-arguments)
 - [Java 8 Stream skip() vs limit()](https://www.baeldung.com/java-stream-skip-vs-limit)

core-java-modules/core-java-8-2/pom.xml

@@ -33,4 +33,5 @@
         <icu.version>64.2</icu.version>
         <assertj.version>3.12.2</assertj.version>
     </properties>
+
 </project>

core-java-modules/core-java-8/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -76,4 +77,5 @@
         <!-- plugins -->
         <spring-boot-maven-plugin.version>2.0.4.RELEASE</spring-boot-maven-plugin.version>
     </properties>
+
 </project>

core-java-modules/core-java-9-improvements/pom.xml

@@ -1,9 +1,10 @@
+<?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>core-java-9</artifactId>
+    <artifactId>core-java-9-improvements</artifactId>
     <version>0.2-SNAPSHOT</version>
-    <name>core-java-9</name>
+    <name>core-java-9-improvements</name>
 
     <parent>
         <groupId>com.baeldung</groupId>
@@ -39,7 +40,7 @@
     </dependencies>
 
     <build>
-        <finalName>core-java-9</finalName>
+        <finalName>core-java-9-improvements</finalName>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>

core-java-modules/core-java-9-jigsaw/pom.xml

@@ -1,9 +1,10 @@
+<?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>core-java-9-jigsaw</artifactId>
     <version>0.2-SNAPSHOT</version>
-    <name>core-java-9</name>
+    <name>core-java-9-jigsaw</name>
 
     <parent>
         <groupId>com.baeldung</groupId>

core-java-modules/core-java-9-new-features/pom.xml

@@ -1,9 +1,10 @@
+<?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>core-java-9-new-features</artifactId>
     <version>0.2-SNAPSHOT</version>
-    <name>core-java-9</name>
+    <name>core-java-9-new-features</name>
 
     <parent>
         <groupId>com.baeldung</groupId>

core-java-modules/core-java-9-streams/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -13,9 +14,6 @@
         <relativePath>../../parent-java</relativePath>
     </parent>
 
-    <dependencies>
-    </dependencies>
-
     <build>
         <finalName>core-java-9-streams</finalName>
         <resources>
@@ -26,6 +24,4 @@
         </resources>
     </build>
 
-    <properties>
-    </properties>
 </project>

core-java-modules/core-java-9/pom.xml

@@ -1,3 +1,4 @@
+<?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>

core-java-modules/core-java-annotations/pom.xml

@@ -1,3 +1,4 @@
+<?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>

core-java-modules/core-java-arrays-2/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -39,7 +40,6 @@
     </build>
 
     <properties>
-
         <!-- util -->
         <commons-lang3.version>3.9</commons-lang3.version>
         <!-- testing -->

core-java-modules/core-java-arrays/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -356,7 +357,6 @@
     </profiles>
 
     <properties>
-
         <!-- util -->
         <commons-lang3.version>3.9</commons-lang3.version>
 

core-java-modules/core-java-collections-2/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -54,4 +55,5 @@
         <junit.platform.version>1.2.0</junit.platform.version>
         <commons-exec.version>1.3</commons-exec.version>
     </properties>
+
 </project>

core-java-modules/core-java-collections-3/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -31,4 +32,5 @@
         <openjdk.jmh.version>1.19</openjdk.jmh.version>
         <assertj.version>3.11.1</assertj.version>
     </properties>
+
 </project>

core-java-modules/core-java-collections-array-list/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -31,4 +32,5 @@
         <commons-collections4.version>4.1</commons-collections4.version>
         <assertj.version>3.11.1</assertj.version>
     </properties>
+
 </project>

core-java-modules/core-java-collections-list-2/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -37,4 +38,5 @@
         <commons-collections4.version>4.1</commons-collections4.version>
         <assertj.version>3.11.1</assertj.version>
     </properties>
+
 </project>

core-java-modules/core-java-collections-list-3/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -61,4 +62,5 @@
         <fastutil.version>8.1.0</fastutil.version>
         <colt.version>1.2.0</colt.version>
     </properties>
+
 </project>

core-java-modules/core-java-collections-list/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -37,4 +38,5 @@
         <commons-lang3.version>3.8.1</commons-lang3.version>
         <assertj.version>3.11.1</assertj.version>
     </properties>
+
 </project>

core-java-modules/core-java-collections-set/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -35,4 +36,5 @@
         <commons-collections4.version>4.3</commons-collections4.version>
         <gson.version>2.8.5</gson.version>
     </properties>
+
 </project>

core-java-modules/core-java-collections/pom.xml

@@ -1,3 +1,4 @@
+<?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>
@@ -36,4 +37,5 @@
         <openjdk.jmh.version>1.19</openjdk.jmh.version>
         <assertj.version>3.11.1</assertj.version>
     </properties>
+
 </project>