Hi Guys,

I am looking to move our existing ant infrastructure to Gradle progressively. As such, I am importing an ant build and just trying to run the ant tasks from gradle.

Our build environment uses Ivy and Ant.

The setup is a basic build.xml that imports a large build-common-ant.xml that imports a large build-common-ivy.xml. Most of the tasks work, however, every now and again I hit a ConcurrentModificationException.

It sometimes gets resolved by specifying the and target to as build-common.export instead of just export.I haven't been able to assemble a small example that exhibits this behavior yet.

Here's the stack trace:

• Exception is:
  java.util.ConcurrentModificationException
  at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.removeShouldRunAfterSuccessorsIfTheyImposeACycle(DefaultTaskExecutionPlan.java:298)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.determineExecutionPlan(DefaultTaskExecutionPlan.java:223)
  at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.ensurePopulated(DefaultTaskGraphExecuter.java:150)
  at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:84)
  at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:29)
  at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
  at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
  at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68)
  at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
  at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
  at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55)
  at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:149)
  at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:106)
  at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)
  at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:80)
  at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:33)
  at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:24)
  at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:36)
  at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26)
  at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:51)
  at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:171)
  at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237)
  at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210)
  at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
  at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
  at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206)
  at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
  at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
  at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
  at org.gradle.launcher.Main.doAction(Main.java:33)
  at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
  at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)
  at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
  at org.gradle.launcher.GradleMain.main(GradleMain.java:23)

I am running the latest 2.1 release of Gradle.

If someone can point me in the right direction to investigate?

Thanks,
Marc