Merge remote-tracking branch 'upstream/master'

core-java/src/main/java/com/baeldung/streamApi/JoinerSplitter.java

@@ -7,28 +7,32 @@ import java.util.stream.Stream;
 
 public class JoinerSplitter {
 
-	public static String join ( String[] arrayOfString ) {
+    public static String join(String[] arrayOfString) {
-		return Arrays.asList(arrayOfString)
+        return Arrays
+          .asList(arrayOfString)
           .stream()
           .map(x -> x)
           .collect(Collectors.joining(","));
     }
 
-	public static String joinWithPrefixPostFix ( String[] arrayOfString ) {
+    public static String joinWithPrefixPostFix(String[] arrayOfString) {
-		return Arrays.asList(arrayOfString)
+        return Arrays
+          .asList(arrayOfString)
           .stream()
           .map(x -> x)
-				.collect(Collectors.joining(",","[","]"));
+          .collect(Collectors.joining(",", "[", "]"));
     }
 
-	public static List<String> split ( String str ) {
+    public static List<String> split(String str) {
-		return Stream.of(str.split(","))
+        return Stream
-				.map (elem -> new String(elem))
+          .of(str.split(","))
+          .map(elem -> new String(elem))
           .collect(Collectors.toList());
     }
 
-	public static List<Character> splitToListOfChar ( String str ) {
+    public static List<Character> splitToListOfChar(String str) {
-		return str.chars()
+        return str
+          .chars()
           .mapToObj(item -> (char) item)
           .collect(Collectors.toList());
     }

jackson/pom.xml

@@ -67,6 +67,12 @@
             <version>${jackson.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jdk8</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+
         <dependency>
             <groupId>joda-time</groupId>
             <artifactId>joda-time</artifactId>
@@ -152,7 +158,7 @@
             <groupId>org.slf4j</groupId>
             <artifactId>log4j-over-slf4j</artifactId>
             <version>${org.slf4j.version}</version>
-</dependency>
+        </dependency>
 
     </dependencies>
 
@@ -189,7 +195,7 @@
 
     <properties>
         <!-- marshalling -->
-        <jackson.version>2.8.5</jackson.version>
+        <jackson.version>2.8.6</jackson.version>
 
         <!-- logging -->
         <org.slf4j.version>1.7.21</org.slf4j.version>

jackson/src/main/java/com/baeldung/jackson/entities/ActorJackson.java

@@ -4,6 +4,7 @@ import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.List;
+import java.util.Locale;
 import java.util.TimeZone;
 
 public class ActorJackson {
@@ -53,7 +54,7 @@ public class ActorJackson {
     }
 
     private String formatDateOfBirth() {
-        final DateFormat formatter = new SimpleDateFormat("EEE MMM dd hh:mm:ss zzz yyyy");
+        final DateFormat formatter = new SimpleDateFormat("EEE MMM dd hh:mm:ss zzz yyyy", Locale.US);
         formatter.setTimeZone(TimeZone.getTimeZone("GMT"));
         return formatter.format(dateOfBirth);
     }

jackson/src/main/java/com/baeldung/jackson/miscellaneous/mixin/Book.java

@@ -0,0 +1,25 @@
+package com.baeldung.jackson.miscellaneous.mixin;
+
+import java.util.Optional;
+
+public class Book {
+
+    private String title;
+    private Optional<String> subTitle;
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public Optional<String> getSubTitle() {
+        return subTitle;
+    }
+
+    public void setSubTitle(Optional<String> subTitle) {
+        this.subTitle = subTitle;
+    }
+}

jackson/src/test/java/com/baeldung/jackson/deserialization/JacksonDeserializeTest.java

@@ -3,12 +3,10 @@ package com.baeldung.jackson.deserialization;
 import java.io.IOException;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
-
 import com.baeldung.jackson.entities.Movie;
-import org.junit.Assert;
 import org.junit.Test;
-
 import com.fasterxml.jackson.databind.ObjectMapper;
+import static org.junit.Assert.assertEquals;
 
 public class JacksonDeserializeTest {
 
@@ -20,7 +18,7 @@ public class JacksonDeserializeTest {
         final Movie movie = mapper.readValue(jsonInput, Movie.class);
 
         final String expectedOutput = "Movie [imdbId=tt0472043, director=null, actors=[ActorJackson [imdbId=nm2199632, dateOfBirth=Tue Sep 21 11:00:00 GMT 1982, filmography=[Apocalypto, Beatdown, Wind Walkers]]]]";
-        Assert.assertEquals(movie.toString(), expectedOutput);
+        assertEquals(expectedOutput, movie.toString());
     }
 
     @Test
@@ -35,7 +33,7 @@ public class JacksonDeserializeTest {
         final Movie movie = mapper.readValue(jsonInput, Movie.class);
 
         final String expectedOutput = "Movie [imdbId=tt0472043, director=Mel Gibson, actors=[ActorJackson [imdbId=nm2199632, dateOfBirth=Tue Sep 21 11:00:00 GMT 1982, filmography=[Apocalypto, Beatdown, Wind Walkers]]]]";
-        Assert.assertEquals(movie.toString(), expectedOutput);
+        assertEquals(expectedOutput, movie.toString());
     }
 
 }

jackson/src/test/java/com/baeldung/jackson/miscellaneous/mixin/OptionalTypeTest.java

@@ -0,0 +1,61 @@
+package com.baeldung.jackson.miscellaneous.mixin;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
+import static io.restassured.path.json.JsonPath.from;
+import java.io.IOException;
+import java.util.Optional;
+import static org.assertj.core.api.Assertions.assertThat;
+import org.junit.Test;
+
+public class OptionalTypeTest {
+
+    ObjectMapper mapper = new ObjectMapper().registerModule(new Jdk8Module());
+
+    @Test
+    public void givenPresentOptional_whenSerializing_thenValueInJson() throws JsonProcessingException {
+
+        String subTitle = "The Parish Boy's Progress";
+        Book book = new Book();
+        book.setTitle("Oliver Twist");
+        book.setSubTitle(Optional.of(subTitle));
+
+        String result = mapper.writeValueAsString(book);
+
+        assertThat(from(result).getString("subTitle")).isEqualTo(subTitle);
+    }
+
+    @Test
+    public void givenEmptyOptional_whenSerializing_thenNullValue() throws JsonProcessingException {
+
+        Book book = new Book();
+        book.setTitle("Oliver Twist");
+        book.setSubTitle(Optional.empty());
+
+        String result = mapper.writeValueAsString(book);
+
+        assertThat(from(result).getString("subTitle")).isNull();
+    }
+
+    @Test
+    public void givenField_whenDeserializingIntoOptional_thenIsPresentWithValue() throws IOException {
+
+        String subTitle = "The Parish Boy's Progress";
+        String book = "{ \"title\": \"Oliver Twist\", \"subTitle\": \"" + subTitle + "\" }";
+
+        Book result = mapper.readValue(book, Book.class);
+
+        assertThat(result.getSubTitle()).isEqualTo(Optional.of(subTitle));
+    }
+
+    @Test
+    public void givenNullField_whenDeserializingIntoOptional_thenIsEmpty() throws IOException {
+
+        String book = "{ \"title\": \"Oliver Twist\", \"subTitle\": null }";
+
+        Book result = mapper.readValue(book, Book.class);
+
+        assertThat(result.getSubTitle()).isEmpty();
+    }
+}