ANTLR 4.2 is a major feature and bugfix update to ANTLR 4. For most users upgrading from ANTLR 4.1, this is a source- and binary-compatible update. However, to maximize the benefits provided by the update, we highly recommend that you regenerate your lexers and parsers using the latest version of the Tool.
Please see the latest release for links to the current documentation.
ParserInterpreterare much more powerful and now part of the runtime library (details)
@Nullableat compile time, and is available through Maven separately from the rest of ANTLR 4 in the new antlr4-annotations artifact (#434, #435) Note: This feature is only available for Maven users; not as part of the standalone ANTLR downloads.