InvalidLink

This error is triggered by a Javadoc @link tag that either is syntactically invalid or can't be resolved. See javadoc documentation for an explanation of how to correctly format the contents of this tag.

Linking to generic types

Use the erased type of method parameters in @link tags. For example, write {@link #foo(List)} instead of {@link #foo(List<Bah>)}. Javadoc does yet not support generics in @link tags, due to a bug: JDK-5096551.

Limitations

This check is very limited in terms of which unresolved links it can be sure are unresolvable. Code within Google is often compiled on a per-package or even per-file basis, and Error Prone only has visibility into the current compilation.