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The following code works as expected:

@JsonIgnoreProperties({"foobar"})
public static class Foo {
    public String foo = "a";
    public String bar = "b";

    public String foobar = "c";
}

//Test code
ObjectMapper mapper = new ObjectMapper();
Foo foo = new Foo();
foo.foobar = "foobar";
foo.foo = "Foo";
String out = mapper.writeValueAsString(foo);
Foo f = mapper.readValue(out, Foo.class);

I'm using @RestController and this works.

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Also worth noting is this solution using DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES: https://stackoverflow.com/a/18850479/1256179

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With Jackson > 1.9.11 and < 2.x use @JsonSerialize annotation to do that:

@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
@JsonSerialize(using = FooSerializer.class, include = JsonSerialize.Inclusion.NON_NULL)

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With Jackson > 1.9.11 and < 2.x use @JsonSerialize annotation to do that:

@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
@JsonSerialize(using = FooSerializer.class, include = JsonSerialize.Inclusion.NON_NULL)

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With Jackson > 1.9.11 and < 2.x use @JsonSerialize annotation to do that:

@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
@JsonSerialize(using = FooSerializer.class, include = JsonSerialize.Inclusion.NON_NULL)

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To suppress serializing properties with null values, you can configure the ObjectMapper directly, or make use of the @JsonInclude annotation:

mapper.setSerializationInclusion(Include.NON_NULL);
@JsonInclude(Include.NON_NULL)
class Foo
{
  String bar;
}

Alternatively, you could use @JsonInclude in a getter so that the attribute would be shown if the value is not null.

@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)

The API changed a bit with the 2.0 release.

@JsonInclude(Include.NON_NULL) works like a champ when I create a new object with some properties (but some null) and then serialize it to JSON. However, oddly, when I grab an object using a DAO of sorts then serialize that, it doesn't appear to take effect and I get the null properties again. It may not be playing nice with Hibernate or DropWizard, but does any of this ring a bell? Are there times where @JsonInclude would be ignored?

Yeah, I just confirmed that the @JsonInclude notation doesn't work, but this works like a charm: @JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL) (I'm using Jackson 1.9.12 with Spring 3.2.2.)

@MartinAsenov - the answer shows the most recent API; it was changed from the @JsonSerialize syntax to @JsonInclude. The older syntax is deprecated.

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To suppress serializing properties with null values, you can configure the ObjectMapper directly, or make use of the @JsonInclude annotation:

mapper.setSerializationInclusion(Include.NON_NULL);
@JsonInclude(Include.NON_NULL)
class Foo
{
  String bar;
}

Alternatively, you could use @JsonInclude in a getter so that the attribute would be shown if the value is not null.

@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)

The API changed a bit with the 2.0 release.

Yeah, I just confirmed that the @JsonInclude notation doesn't work, but this works like a charm: @JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL) (I'm using Jackson 1.9.12 with Spring 3.2.2.)

@MartinAsenov - the answer shows the most recent API; it was changed from the @JsonSerialize syntax to @JsonInclude. The older syntax is deprecated.

java - How to tell Jackson to ignore a field during serialization if i...

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To suppress serializing properties with null values, you can configure the ObjectMapper directly, or make use of the @JsonInclude annotation:

mapper.setSerializationInclusion(Include.NON_NULL);
@JsonInclude(Include.NON_NULL)
class Foo
{
  String bar;
}

Alternatively, you could use @JsonInclude in a getter so that the attribute would be shown if the value is not null.

@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)

The API changed a bit with the 2.0 release.

Yeah, I just confirmed that the @JsonInclude notation doesn't work, but this works like a charm: @JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL) (I'm using Jackson 1.9.12 with Spring 3.2.2.)

@MartinAsenov - the answer shows the most recent API; it was changed from the @JsonSerialize syntax to @JsonInclude. The older syntax is deprecated.

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Just to expand on the other answers - if you need to control the omission of null values on a per-field basis, annotate the field in question (or alternatively annotate the field's 'getter').

e.g. here only fieldOne will be ommitted from json if it is null. fieldTwo will always be included regardless of if it is null.

example - here only fieldOne will be ommitted from json if it is null. fieldTwo will always be included regardless of if it is null.

public class Foo {

    @JsonInclude(JsonInclude.Include.NON_NULL) 
    private String fieldOne;

    private String fieldTwo;
}
public class Foo {

    @JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
    private String fieldOne;

    private String fieldTwo;
}

To omit all null values in the class as a default, annotate the class. Per-field/getter annotations can still be used to override this default if necessary.

example - here fieldOne and fieldTwo will be ommitted from json if they are null, respectively, because this is the default set by the class annotation. fieldThree however will override the default and will always be included, because of the annotation on the field.

e.g. here fieldOne and fieldTwo will be ommitted from json if they are null, respectively, because this is the default set by the class annotation. fieldThree however will override the default and will always be included, because of the annotation on the field.

@JsonInclude(JsonInclude.Include.NON_NULL)
public class Foo {

    private String fieldOne;

    private String fieldTwo;

    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String fieldThree;
}
@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
public class Foo {

    private String fieldOne;

    private String fieldTwo;

    @JsonSerialize(include=JsonSerialize.Inclusion.ALWAYS)
    private String fieldThree;
}
@JsonSerialize(include=JsonSerialize.Inclusion.ALWAYS)
@JsonInclude(JsonInclude.Include.NON_NULL)

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Just to expand on the other answers - if you need to control the omission of null values on a per-field basis, annotate the field in question (or alternatively annotate the field's 'getter').

example - here only fieldOne will be ommitted from json if it is null. fieldTwo will always be included regardless of if it is null.

public class Foo {

    @JsonInclude(JsonInclude.Include.NON_NULL) 
    private String fieldOne;

    private String fieldTwo;
}

To omit all null values in the class as a default, annotate the class. Per-field/getter annotations can still be used to override this default if necessary.

example - here fieldOne and fieldTwo will be ommitted from json if they are null, respectively, because this is the default set by the class annotation. fieldThree however will override the default and will always be included, because of the annotation on the field.

@JsonInclude(JsonInclude.Include.NON_NULL)
public class Foo {

    private String fieldOne;

    private String fieldTwo;

    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String fieldThree;
}
@JsonSerialize(include=JsonSerialize.Inclusion.ALWAYS)
@JsonInclude(JsonInclude.Include.NON_NULL)

java - How to tell Jackson to ignore a field during serialization if i...

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Just to expand on the other answers - if you need to control the omission of null values on a per-field basis, annotate the field in question (or alternatively annotate the field's 'getter').

example - here only fieldOne will be ommitted from json if it is null. fieldTwo will always be included regardless of if it is null.

public class Foo {

    @JsonInclude(JsonInclude.Include.NON_NULL) 
    private String fieldOne;

    private String fieldTwo;
}

To omit all null values in the class as a default, annotate the class. Per-field/getter annotations can still be used to override this default if necessary.

example - here fieldOne and fieldTwo will be ommitted from json if they are null, respectively, because this is the default set by the class annotation. fieldThree however will override the default and will always be included, because of the annotation on the field.

@JsonInclude(JsonInclude.Include.NON_NULL)
public class Foo {

    private String fieldOne;

    private String fieldTwo;

    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String fieldThree;
}
@JsonSerialize(include=JsonSerialize.Inclusion.ALWAYS)
@JsonInclude(JsonInclude.Include.NON_NULL)

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@JsonInclude(JsonInclude.Include.NON_NULL)

Why/how does this not work with 2.5.1?

@ams , this annotation should wrapper a class

Could you also include the fully qualified name? Jackson has multiple annotations with the same name and a different package, so that is ambiguous.

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@JsonInclude(JsonInclude.Include.NON_NULL)

Why/how does this not work with 2.5.1?

@ams , this annotation should wrapper a class

Could you also include the fully qualified name? Jackson has multiple annotations with the same name and a different package, so that is ambiguous.

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@JsonInclude(JsonInclude.Include.NON_NULL)

Why/how does this not work with 2.5.1?

@ams , this annotation should wrapper a class

Could you also include the fully qualified name? Jackson has multiple annotations with the same name and a different package, so that is ambiguous.

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You can use the following mapper configuration:

mapper.getSerializationConfig().setSerializationInclusion(Inclusion.NON_NULL);

Since 2.5 you can user:

mapper.setSerializationInclusion(Include.NON_NULL);

Since this is deprecated in 1.9, use mapper.getSerializationConfig().withSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);

getSerializationConfig()
Note that since instances are immutable, you can NOT change settings by accessing an instance and calling methods: this will simply create new instance of config object.

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You can use the following mapper configuration:

mapper.getSerializationConfig().setSerializationInclusion(Inclusion.NON_NULL);

Since 2.5 you can user:

mapper.setSerializationInclusion(Include.NON_NULL);

Since this is deprecated in 1.9, use mapper.getSerializationConfig().withSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);

getSerializationConfig()
Note that since instances are immutable, you can NOT change settings by accessing an instance and calling methods: this will simply create new instance of config object.

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java jackson
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You can use the following mapper configuration:

mapper.getSerializationConfig().setSerializationInclusion(Inclusion.NON_NULL);

Since 2.5 you can user:

mapper.setSerializationInclusion(Include.NON_NULL);

Since this is deprecated in 1.9, use mapper.getSerializationConfig().withSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);

getSerializationConfig()
Note that since instances are immutable, you can NOT change settings by accessing an instance and calling methods: this will simply create new instance of config object.

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If you want to add this rule to all models in Jackson 2.6+ use:

mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

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If you want to add this rule to all models in Jackson 2.6+ use:

mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

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If you want to add this rule to all models in Jackson 2.6+ use:

mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

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java jackson