Unrecognized option --help is not valid. Usage: schemagen [-options ...] Options: -d : specify where to place processor and javac generated class files -cp : specify where to find user specified files -classpath : specify where to find user specified files -encoding : specify encoding to be used for annotation processing/javac invocation -episode : generate episode file for separate compilation -disableXmlSecurity : disables XML security features for usage on xml parsing apis -version : display version information -fullversion : display full version information -help : display this usage message