Weld should ignore synthetic members

Instead of the method parameter use an additional local variable with the same value assigned; i.e. instead of: public void observe(@Observes @Juicy String payload) { Arrays.asList( "foo" ).stream().filter((s) -> s.equals(payload)); } use this: public void observe(@Observes @Juicy String payload) { String p = payload; Arrays.asList( "foo" ).stream().filter((s) -> s.equals(p)); }