Wrong "method [...] not applicable for the arguments" error in Greclipse, not in Groovy

[mauromol]

Consider the attached project, which is a variation of the one attached to #1300.

Compiling with ./gradlew jar works fine.
However if in Greclipse you open class test2.TestGreclipseError2, you'll get the following error:

The method extractResult(T) in the type TestGreclipseError2 is not applicable for the arguments (Response)

This drove me crazy because I could not understand why this was failing. Then, after extracting a test case for #1300, I made a quick test and discovered that groovyc compiles this fine, so it must be some glitch in Greclipse compiler I believe.

TestGroovyGradle2.zip

[mauromol]

The workaround described at #1300 (comment) seems to fix this error as well in the provided test case, however in my main project (from which I extracted the test case) it seems not to be enough... I'm trying to understand why...

[mauromol]

Ok, I determined that the problem in my main project is bound to null annotation analysis (@NonNullByDefault is too aggressive in this specific case), after I fixed that I can confirm that the workaround at #1300 (comment) indeed fixes this as well.

So, I close this since the origin of the problem is the same as #1300.