| Annotation Type | Description | 
|---|---|
| Beta | Signifies that a public API (public class, method or field) is subject to
 incompatible changes, or even removal, in a future release. | 
| GwtCompatible | The presence of this annotation on a type indicates that the type may be
 used with the
 Google Web Toolkit (GWT). | 
| GwtIncompatible | The presence of this annotation on a method indicates that the method may
 not be used with the
 Google Web Toolkit (GWT),
 even though its type is annotated as  GwtCompatibleand accessible in
 GWT. | 
| VisibleForTesting | Annotates a program element that exists, or is more widely visible than
 otherwise necessary, only for use in test code. | 
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