I want to use Sonar plugin from Gradle script. I can't use the Sonar plugin for Hudson because we don't use Maven. So I decided try using a plugin for gradle. Here is what I added to my script.

apply plugin: "sonar"

sonar

After configuring Gradle build to execute the 'sonar' task I get this exception.

:kriya:sonar

FAILURE: Build aborted because of an internal error.

• What went wrong:
  Build aborted because of an unexpected internal error. Please file an issue at: http://www.gradle.org.

• Try:
  Run with --debug option to get additional debug info.

• Exception is:
  java.lang.IncompatibleClassChangeError: the number of constructors during runtime and compile time for java.lang.ClassLoader do not match. Expected 2 but got 3
  at groovy.lang.MetaClassImpl.selectConstructorAndTransformArguments(MetaClassImpl.java:1403)
  at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.selectConstructorAndTransformArguments(ScriptBytecodeAdapter.java:237)
  at org.gradle.api.plugins.sonar.internal.ClassesOnlyClassLoader.<init>(ClassesOnlyClassLoader.groovy:24)
  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$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:102)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:52)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:190)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:198)
  at org.gradle.api.plugins.sonar.Sonar$_execute_closure1.doCall(Sonar.groovy:109)
  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.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
  at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
  at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:273)
  at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:886)
  at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:66)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:44)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:141)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:149)
  at org.gradle.api.plugins.sonar.Sonar$_execute_closure1.doCall(Sonar.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:597)
  at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
  at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
  at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:273)
  at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:886)
  at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:39)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)
  at org.gradle.api.plugins.sonar.Sonar.withErrorSqlLogging(Sonar.groovy:253)
  at org.gradle.api.plugins.sonar.Sonar.this$5$withErrorSqlLogging(Sonar.groovy)
  at org.gradle.api.plugins.sonar.Sonar$this$5$withErrorSqlLogging.callCurrent(Unknown Source)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:44)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:141)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:149)
  at org.gradle.api.plugins.sonar.Sonar.execute(Sonar.groovy:104)
  at org.gradle.execution.DefaultTaskGraphExecuter.executeTask(DefaultTaskGraphExecuter.java:167)
  at org.gradle.execution.DefaultTaskGraphExecuter.doExecute(DefaultTaskGraphExecuter.java:160)
  at org.gradle.execution.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:78)
  at org.gradle.execution.TaskNameResolvingBuildExecuter.execute(TaskNameResolvingBuildExecuter.java:113)
  at org.gradle.execution.DelegatingBuildExecuter.execute(DelegatingBuildExecuter.java:54)
  at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:153)
  at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:107)
  at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:75)
  at org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:41)
  at org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:27)
  at org.gradle.launcher.CommandLineActionFactory$WithLoggingAction.execute(CommandLineActionFactory.java:209)
  at org.gradle.launcher.CommandLineActionFactory$WithLoggingAction.execute(CommandLineActionFactory.java:193)
  at org.gradle.launcher.Main.execute(Main.java:55)
  at org.gradle.launcher.Main.main(Main.java:40)
  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.launcher.ProcessBootstrap.runNoExit(ProcessBootstrap.java:46)
  at org.gradle.launcher.ProcessBootstrap.run(ProcessBootstrap.java:28)
  at org.gradle.launcher.GradleMain.main(GradleMain.java:24)

BUILD FAILED

Total time: 11.485 secs
Recording test results
Finished: FAILURE