z2-Environment

It may be beneficial to be able to specify the compiler order per java component part {api,impl,test}. For example, aspectJ is almost never useful in the API, possibly even dangerous. Groovy, in many cases, will be used for tests only but the groovy compiler is not as optimized as the Java compiler.

Suggestion:

java.compile.order=...

as today. But overrides

java.compiler.order.api=...
java.compiler.order.impl=...
java.compiler.order.test=...

Secondly, a compiler has very little information what it is compiling actually. Yet, the compiler interface is not extensible.

Change it to

boolean compile(ICompilationContext context)