Here is the stack trace of the exception
java.util.ConcurrentModificationException.
Please check the build log for more details.
at org.apache.tools.ant.taskdefs.Exit.execute(Exit.java:162)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.GeneratedMethodAccessor6.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:99)
at org.apache.tools.ant.Task.perform(Task.java:350)
at org.apache.tools.ant.Target.execute(Target.java:449)
at org.apache.tools.ant.Target.performTasks(Target.java:470)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1391)
at
org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:36)
at org.apache.tools.ant.Project.executeTargets(Project.java:1254)
at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:437)
at
org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:106)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.GeneratedMethodAccessor6.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:99)
at org.apache.tools.ant.Task.perform(Task.java:350)
at java.util.Vector.forEach(Vector.java:1275)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:67)
at
net.sf.antcontrib.logic.TryCatchTask$CatchBlock.execute(TryCatchTask.java:138)
at net.sf.antcontrib.logic.TryCatchTask.execute(TryCatchTask.java:224)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.GeneratedMethodAccessor6.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:99)
at org.apache.tools.ant.Task.perform(Task.java:350)
at org.apache.tools.ant.Target.execute(Target.java:449)
at org.apache.tools.ant.Target.performTasks(Target.java:470)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1391)
at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1254)
at org.apache.tools.ant.Main.runBuild(Main.java:830)
at org.apache.tools.ant.Main.startAnt(Main.java:223)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:284)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:101)
From: Avanish Kant <ak...@manh.com>
Date: Wednesday, 20 November 2019 at 1:38 PM
To: "user@ant.apache.org" <user@ant.apache.org>
Subject: ConcurrentModificationException when running with Parallel-Ant executor
This relates to the issue and fix provided as a part of following PR.
https://github.com/apache/ant/pull/81
I understand that this fix is available as part of Ant 1.10.6. However I
continue to face this problem even with Ant 1.10.6.
I have a new task defined (run-module-target) in one of my build script
(macro-library.xml), which gets called by another build script
(common-include.xml).
/builds/v2020/demand-forecasting/scpp-stable-source/scpp-builder/build/common-include.xml:564:
The following error occurred while executing this line:
/builds/v2020/demand-forecasting/scpp-stable-source/scpp-builder/build/macro-library.xml:880:
The following error occurred while executing this line:
/builds/v2020/demand-forecasting/scpp-stable-source/scpp-builder/build/macro-library.xml:890:
java.util.ConcurrentModificationException.
Above ConcurrentModificationException is thrown by following line of code in
macro-library.xml (details can be found in the code snippet below).
<ant antfile="${@{module}.config.dir}/@{module}-build.xml" inheritRefs="true"
target="@{target}">
Please note that this issue happens intermittently. I did not get the complete
exception trace as seen on the PR. Do I need to run ant command with verbose
flag?
Code snippet from common-include.xml:
<!-- - - - - - - - - - - - - - - - -->
<!-- M a c r o F u n c t i o n s -->
<!-- - - - - - - - - - - - - - - - -->
<import file="macro-library.xml" />
<target name="war" depends="-init,-fetch-runtime-lib">
<prepare-war />
<run-module-target modules="${user.modules}" target="post-war"
parallel="true" target.optional="true" />
<print-timestamp target="war" />
</target>
Code snippet from macro-library.xml:
<macrodef name="run-module-target">
<attribute name="modules"/>
<attribute name="target"/>
<attribute name="parallel" default="false" />
<attribute name="target.optional"
default="false" />
<sequential>
<for list="@{modules}"
param="module" parallel="@{parallel}">
<sequential>
<property name="@{module}.config.dir" value="${@{module}.module.dir}/Config/" />
<available property="@{module}.exists" file="${@{module}.config.dir}"
type="dir" />
<if>
<equals arg1="${@{module}.exists}" arg2="true" />
<then>
<trycatch property="@{module}.@{target}.prop"
reference="@{module}.@{target}.ref">
<try>
<echo
message="processing target '@{target}' for module @{module}"/>
<ant
antfile="${@{module}.config.dir}/@{module}-build.xml" inheritRefs="true"
target="@{target}">
<property name="modulename"
value="@{module}" />
<property name="module.classes.dir" value="${global.war.classes.dir}" />
<property name="module.impl.dir"
value="${global.war.classes.dir}" />
</ant>
</try>
<catch>
<if>
<and>
<contains casesensitive="false"
string="${@{module}.@{target}.prop}" substring=""@{target}" does not
exist in the project" />
<equals arg1="@{target.optional}" arg2="true" />
</and>
<then>
<echo message="Error running the target :
${@{module}.@{target}.prop}" level="verbose" />
<echo message="Optional target @{target} does not exist in
${@{module}.config.dir}/@{module}-build.xml. So skipping it" />
</then>
<else>
<throw refid="@{module}.@{target}.ref" />
</else>
</if>
</catch>
</trycatch>
</then>
<else>
<echo>@{module} found in composition but
${@{module}.module.dir}/Config does not exist. Target '@{target}' for @{module}
will be skipped</echo>
</else>
</if>
</sequential>
</for>
</sequential>
</macrodef>
Thanks,
Avanish
