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 package com.fasterxml.jackson.annotation;
Marker annotation that indicates that the annotated method or field is to be ignored by introspection-based serialization and deserialization functionality. That is, it should not be consider a "getter", "setter" or "creator".

In addition, starting with Jackson 1.9, if this is the only annotation associated with a property, it will also cause cause the whole property to be ignored: that is, if setter has this annotation and getter has no annotations, getter is also effectively ignored. It is still possible for different accessors to use different annotations; so if only "getter" is to be ignored, other accessors (setter or field) would need explicit annotation to prevent ignoral (usually JsonProperty).

For example, a "getter" method that would otherwise denote a property (like, say, "getValue" to suggest property "value") to serialize, would be ignored and no such property would be output unless another annotation defines alternative method to use.

Before version 1.9, this annotation worked purely on method-by-method (or field-by-field) basis; annotation on one method or field did not imply ignoring other methods or fields. However, with version 1.9 and above, annotations associated with various accessors (getter, setter, field, constructor parameter) of a logical property are combined; meaning that annotations in one (say, setter) can have effects on all of them (if getter or field has nothing indicating otherwise).

Annotation is usually used just a like a marker annotation, that is, without explicitly defining 'value' argument (which defaults to true): but argument can be explicitly defined. This can be done to override an existing JsonIgnore by explicitly defining one with 'false' argument.

Annotation is similar to javax.xml.bind.annotation.XmlTransient

public @interface JsonIgnore
Optional argument that defines whether this annotation is active or not. The only use for value 'false' if for overriding purposes (which is not needed often); most likely it is needed for use with "mix-in annotations" (aka "annotation overrides"). For most cases, however, default value of "true" is just fine and should be omitted.
    boolean value() default true;
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