com.google.gwt.core.ext.linker
Annotation Type Transferable

@Documented
@Inherited
@Retention(value=RUNTIME)
@Target(value=TYPE)
public @interface Transferable

An artifact marked with this annotation is passed through a compilation all the way to the final call to Linker.link(com.google.gwt.core.ext.TreeLogger, com.google.gwt.core.ext.LinkerContext, ArtifactSet, boolean) . Try to minimize the number of artifacts so marked.