GitHub user mharmer opened a pull request:
https://github.com/apache/ant/pull/81
Fix rare ConcurrentModificationException when running with Parallel-Ant
executor.
This resolves a rare race condition when running with the
[Parallel-Ant](https://github.com/codeaholics/parallel-ant) executor.
This seems to be triggered concurrently when a reference was being added to
the project at the same time the references were being copied through
Project.getCopyOfReferences(). The stack trace observed in this case was:
```
java.util.ConcurrentModificationException
at java.util.Hashtable$Enumerator.next(Hashtable.java:1387)
at java.util.HashMap.putMapEntries(HashMap.java:512)
at java.util.HashMap.(HashMap.java:490)
at
org.apache.tools.ant.Project.getCopyOfReferences(Project.java:2038)
at
org.apache.tools.ant.util.ScriptRunnerBase.bindToComponent(ScriptRunnerBase.java:307)
at
org.apache.tools.ant.util.ScriptRunnerHelper.getScriptRunner(ScriptRunnerHelper.java:66)
at
org.apache.tools.ant.taskdefs.optional.Script.execute(Script.java:53)
at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:435)
at org.apache.tools.ant.Target.performTasks(Target.java:456)
at
org.codeaholics.tools.build.pant.AntWrapperImpl.executeTarget(Unknown Source)
at
org.codeaholics.tools.build.pant.DependencyGraphEntry.run(Unknown Source)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/pc-doctor/ant ConcurrentModificationReferences
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/ant/pull/81.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #81
commit 01b9073218c9b2f067539bc9f5b21340bf6abd6f
Author: mharmer
Date: 2018-12-11T22:02:37Z
Fixing a potential ConcurrentModificationException that could occur when
running Ant with the Parallel-Ant executor.
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