| 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 an API indicates that the method may not be used with
 the Google Web Toolkit (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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