Allow to set groovyc target version

[shamoh]

Currently I can not set target or source attribute on ant.groovyc task - gaelykPrecompileGroovlet, gaelykPrecompileTemplate.

And when I run gaeRun task with --debug switch I see "Annotations are not supported in the current runtime. Please make sure you are running on a JVM >= 1.5" on command output.

It is just in case "-Dgroovy.target.bytecode=1.6" switch is used. I used that switch because I am looking for fixing of following bug:
Application with groovy sources placed in src/main/groovy works correctly. When I place same groovy sources to src/main/webapp/WEB-INF/groovy I got: "The class XYZ refers to the class XYZ and uses 1 parameters, but the referred class takes no parameters". And mentioned switch "groovy.target.bytecode" I used to set target jdk version of "hot-deploy"/rad Groovy Script recompiller.

[musketyr]

I think the problem could be renamed to Groovy precompilation task do use the Gradle target and source Java versions because I suppose that's the real problem

[musketyr]

@bmuschko could you have look on this issue? it's probably causing some nasty bugs w/ 1.7

[bmuschko]

We should probably automatically reuse the values of the properties sourceCompatibility in the template project. I'd assume that you use 1.6 in this case right?

[musketyr]

yeah, would be nice, sourceCompatibility and targetCompatilibility will be taken from JavaPlugin but I'm not sure, how to do it.

[bmuschko]

OK, sounds good. I will put in a fix tonight.

[musketyr]

great, thx!