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# Package com.google.gwt.core.ext

Classes used to extend the GWT compiler. Developers will use the classes in this package only when creating custom code generators.

## Classes

BadPropertyValueException | Thrown when a deferred binding property contains an invalid value.
Generator | Generates source code for subclasses during deferred binding requests.
UnableToCompleteException | Used to indicate that some part of a multi-step process failed.

## Interfaces

GeneratorContext | Provides metadata to deferred binding generators.
PropertyOracle | Provides deferred binding property values.
TreeLogger | An interface used to log messages in deferred binding generators.