further jackson work

jackson/src/test/java/org/baeldung/jackson/MyDtoIgnoreField.java

@@ -0,0 +1,42 @@
+package org.baeldung.jackson;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+public class MyDtoIgnoreField {
+
+    private String stringValue;
+    @JsonIgnore
+    private int intValue;
+    private boolean booleanValue;
+
+    public MyDtoIgnoreField() {
+        super();
+    }
+
+    // API
+
+    public String getStringValue() {
+        return stringValue;
+    }
+
+    public void setStringValue(final String stringValue) {
+        this.stringValue = stringValue;
+    }
+
+    public int getIntValue() {
+        return intValue;
+    }
+
+    public void setIntValue(final int intValue) {
+        this.intValue = intValue;
+    }
+
+    public boolean isBooleanValue() {
+        return booleanValue;
+    }
+
+    public void setBooleanValue(final boolean booleanValue) {
+        this.booleanValue = booleanValue;
+    }
+
+}

jackson/src/test/java/org/baeldung/jackson/MyMixInForString.java

@@ -3,6 +3,6 @@ package org.baeldung.jackson;
 import com.fasterxml.jackson.annotation.JsonIgnoreType;
 
 @JsonIgnoreType
-public class MyBooleanMixIn {
+public class MyMixInForString {
     //
 }

jackson/src/test/java/org/baeldung/jackson/test/JacksonSerializationUnitTest.java

@@ -7,8 +7,9 @@ import static org.junit.Assert.assertThat;
 import java.io.IOException;
 import java.util.List;
 
-import org.baeldung.jackson.MyBooleanMixIn;
+import org.baeldung.jackson.MyMixInForString;
 import org.baeldung.jackson.MyDto;
+import org.baeldung.jackson.MyDtoIgnoreField;
 import org.baeldung.jackson.MyDtoIgnoreFieldByName;
 import org.baeldung.jackson.MyDtoIncludeNonDefault;
 import org.junit.Test;
@@ -43,7 +44,7 @@ public class JacksonSerializationUnitTest {
     }
 
     @Test
-    public final void givenFieldIsIgnored_whenDtoIsSerialized_thenCorrect() throws JsonParseException, IOException {
+    public final void givenFieldIsIgnoredByName_whenDtoIsSerialized_thenCorrect() throws JsonParseException, IOException {
         final ObjectMapper mapper = new ObjectMapper();
         final MyDtoIgnoreFieldByName dtoObject = new MyDtoIgnoreFieldByName();
         dtoObject.setBooleanValue(true);
@@ -55,10 +56,22 @@ public class JacksonSerializationUnitTest {
         System.out.println(dtoAsString);
     }
 
+    @Test
+    public final void givenFieldIsIgnoredDirectly_whenDtoIsSerialized_thenCorrect() throws JsonParseException, IOException {
+        final ObjectMapper mapper = new ObjectMapper();
+        final MyDtoIgnoreField dtoObject = new MyDtoIgnoreField();
+
+        final String dtoAsString = mapper.writeValueAsString(dtoObject);
+
+        assertThat(dtoAsString, not(containsString("intValue")));
+        assertThat(dtoAsString, containsString("booleanValue"));
+        System.out.println(dtoAsString);
+    }
+
     @Test
     public final void givenFieldTypeIsIgnored_whenDtoIsSerialized_thenCorrect() throws JsonParseException, IOException {
         final ObjectMapper mapper = new ObjectMapper();
-        mapper.addMixInAnnotations(String.class, MyBooleanMixIn.class);
+        mapper.addMixInAnnotations(String.class, MyMixInForString.class);
         final MyDto dtoObject = new MyDto();
         dtoObject.setBooleanValue(true);