Any alternative to #GrabConfig? - unit-testing

Question

I'm using the javax.mail library to send emails that may or may not contain attachments.
I'm also using Groovy 2.0.6 for writing this script and am developing it in Eclipse and running unit tests using Gradle 1.5. The script I'm writing will be deployed in a jar to many different locations in the future. Therefore, the javax.mail needs to be referenced to from my script and not just manually added to the machine's classpath.
To do this, I am using the following statements in my script:
#GrabConfig(systemClassLoader=true)
#Grab(group='javax.mail', module='mail', version='1.4.7')
My issue is that I am unable to run unit tests with Gradle while the #GrabConfig statement is included. It runs fine with just the #Grab statement but fails when the #GrabConfig is in there. The error message I'm receiving is:
:compileJava UP-TO-DATE
:compileGroovy
startup failed:
General error during conversion: No suitable ClassLoader found for grab
java.lang.RuntimeException: No suitable ClassLoader found for grab
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:77)
at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:102)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:57)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:182)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:190)
at groovy.grape.GrapeIvy.chooseClassLoader(GrapeIvy.groovy:181)
at groovy.grape.GrapeIvy$chooseClassLoader.callCurrent(Unknown Source)
at groovy.grape.GrapeIvy.grab(GrapeIvy.groovy:247)
at groovy.grape.Grape.grab(Grape.java:141)
at groovy.grape.GrabAnnotationTransformation.visit(GrabAnnotationTransformation.java:312)
at org.codehaus.groovy.transform.ASTTransformationVisitor$3.call(ASTTransformationVisitor.java:319)
at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:903)
at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:566)
at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:542)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:519)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:498)
at org.gradle.api.internal.tasks.compile.ApiGroovyCompiler.execute(ApiGroovyCompiler.java:118)
at org.gradle.api.internal.tasks.compile.ApiGroovyCompiler.execute(ApiGroovyCompiler.java:39)
at org.gradle.api.internal.tasks.compile.daemon.CompilerDaemonServer.execute(CompilerDaemonServer.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:355)
at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
1 error
:compileGroovy FAILED
FAILURE: Build failed with an exception.
According to No suitable classloader found for grab , #GrabConfig makes code untestable.
Is there any alternative to #GrabConfig for my situation?

Answer 1

You can use the gradle-one-jar plugin to package your own and third-party code into a single executable Jar. Alternatively, you can use Gradle's application plugin to create a Zip distribution with start scripts.

Answer 2

You can disable grapes in build.gradle like so:
test {
systemProperty 'groovy.grape.enable', 'false'
}
compileGroovy {
groovyOptions.forkOptions.jvmArgs = [ '-Dgroovy.grape.enable=false' ]
}
compileTestGroovy {
groovyOptions.forkOptions.jvmArgs = [ '-Dgroovy.grape.enable=false' ]
}