groovy 1.5.6 and delegates

while trying to write a DSL I discovered an annoying bug in groovy 1.5.6, I guess. Basically if I define a delegate for a closure it has to be in the same file as the closure. If i define it in another file I always get a nullpointer exception...


example:



class MyDelegate {
def test() {
println "tada"
}
}

static ExpandoMetaClass createEMC(Class clazz, Closure cl) {
ExpandoMetaClass emc = new ExpandoMetaClass(clazz, false)

cl(emc)

emc.initialize()
return emc
}

Script dslScript = new GroovyShell().parse("test{\ntest()\n}")

dslScript.metaClass = createEMC(dslScript.class, {
ExpandoMetaClass emc ->

emc.test = {

Closure closure ->
closure.delegate = new MyDelegate()
closure.resolveStrategy = Closure.DELEGATE_FIRST

try {
closure()
}
catch (Exception e) {
e.printStackTrace()
}
}
})
dslScript.run()



this works fine. Now if I move the class 'MyDelegate' to it's own file I end up with the following exception.


java.lang.NullPointerException
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.getDelegateMethod(ClosureMetaClass.java:207)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:280)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnCurrentN(ScriptBytecodeAdapter.java:78)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnCurrent0(ScriptBytecodeAdapter.java:112)
at Script1$_run_closure1.doCall(Script1.groovy:2)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:248)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnCurrentN(ScriptBytecodeAdapter.java:78)
at Script1$_run_closure1.doCall(Script1.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:248)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:756)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:778)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:758)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:170)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeClosure(ScriptBytecodeAdapter.java:605)
at edu.ucdavis.genomics.metabolomics.binbase.quantificator.dsl.Tester$_run_closure1_closure2.doCall(Tester.groovy:38)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:248)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:756)
at groovy.lang.Closure.call(Closure.java:292)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaMethod.invoke(ClosureMetaMethod.java:72)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:912)
at groovy.lang.ExpandoMetaClass.invokeMethod(ExpandoMetaClass.java:946)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnCurrentN(ScriptBytecodeAdapter.java:78)
at Script1.run(Script1.groovy:1)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:912)
at groovy.lang.ExpandoMetaClass.invokeMethod(ExpandoMetaClass.java:946)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:756)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:778)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:758)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:170)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethod0(ScriptBytecodeAdapter.java:198)
at edu.ucdavis.genomics.metabolomics.binbase.quantificator.dsl.Tester.run(Tester.groovy:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:912)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:756)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:778)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:758)
at org.codehaus.groovy.runtime.InvokerHelper.runScript(InvokerHelper.java:401)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230)
at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1105)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:749)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:170)
at edu.ucdavis.genomics.metabolomics.binbase.quantificator.dsl.Tester.main(Tester.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230)
at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1105)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:749)
at groovy.lang.GroovyShell.runMainOrTestOrRunnable(GroovyShell.java:244)
at groovy.lang.GroovyShell.run(GroovyShell.java:218)
at groovy.lang.GroovyShell.run(GroovyShell.java:147)
at groovy.ui.GroovyMain.processOnce(GroovyMain.java:493)
at groovy.ui.GroovyMain.run(GroovyMain.java:308)
at groovy.ui.GroovyMain.process(GroovyMain.java:294)
at groovy.ui.GroovyMain.processArgs(GroovyMain.java:111)
at groovy.ui.GroovyMain.main(GroovyMain.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:101)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:130)


time to give groovy 1.6.4 a try and maybe migrate my project over to it.