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https://issues.apache.org/jira/browse/IVY-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15739326#comment-15739326
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jaikiran pai commented on IVY-1499:
-----------------------------------
I just submitted a pull request containing a commit which checks for null to
prevent any potential NPE https://github.com/apache/ant-ivy/pull/11
> NullPointerException while Retrieve
> -----------------------------------
>
> Key: IVY-1499
> URL: https://issues.apache.org/jira/browse/IVY-1499
> Project: Ivy
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.4.0-RC1
> Environment: Hard to say:
> Worked on my System: Win 7 64, Java 6u45, Eclipse Luna and Kepler with
> current Plugins (Ant, Ant Ivy, IvyDE, Ant Ivy Tasker)
> Occured on a very similar system and on my Test System with Lubuntu 14.04 64,
> OpenJDK 1.7.0_65
> Reporter: Marc Meier
> Priority: Minor
> Labels: NullPointerException
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> I encountered a NullPointerException while retrieving an ivy file.
> Unfortunately I'm not able to recreate it properly.
> {panel:title=Stacktrace}
> BUILD FAILED
> /var/lib/jenkins/jobs/antivy/workspace/dev/all.xml:12: The following error
> occurred while executing this line:
> /var/lib/jenkins/jobs/antivy/workspace/dev/common_module_build.xml:74:
> impossible to ivy retrieve: java.lang.RuntimeException: problem during
> retrieve of org.example#org.example.converter: java.lang.NullPointerException
> at
> org.apache.ivy.core.retrieve.RetrieveEngine.retrieve(RetrieveEngine.java:249)
> at org.apache.ivy.Ivy.retrieve(Ivy.java:561)
> at org.apache.ivy.ant.IvyRetrieve.doExecute(IvyRetrieve.java:98)
> at org.apache.ivy.ant.IvyTask.execute(IvyTask.java:271)
> at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
> at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:622)
> 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.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
> at
> org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
> at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
> at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:440)
> at org.apache.tools.ant.taskdefs.SubAnt.execute(SubAnt.java:306)
> at org.apache.tools.ant.taskdefs.SubAnt.execute(SubAnt.java:221)
> at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:622)
> 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.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
> 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:1248)
> at org.apache.tools.ant.Main.runBuild(Main.java:851)
> at org.apache.tools.ant.Main.startAnt(Main.java:235)
> at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
> at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
> Caused by: java.lang.NullPointerException
> at
> org.apache.ivy.core.IvyPatternHelper.substituteTokens(IvyPatternHelper.java:239)
> at
> org.apache.ivy.core.IvyPatternHelper.substitute(IvyPatternHelper.java:171)
> at
> org.apache.ivy.core.retrieve.RetrieveEngine.determineArtifactsToCopy(RetrieveEngine.java:355)
> at
> org.apache.ivy.core.retrieve.RetrieveEngine.retrieve(RetrieveEngine.java:118)
> ... 34 more
> {panel}
> The converter (which is the project I try to build) depends on the core,
> which is also one of our projects. Since we only need the core for its
> dependencies, only the ivy.xml is published in my local repository and needed
> by the converter.
> I tried to figure out, what the problem is. It seems, ivy is unable to
> determine the destPattern (RetrieveEngine.java:355) while retrieving the
> core. While debugging, I noticed the type of the artifact is ivy, while
> destIvyPattern is null. This leads to destPattern being null, too.
> This could be a misconfiguration of any (ivy)pattern in the local repository,
> I'm sorry, I can not give you more information, but my configuration files
> are already changed, so I can not recreate the bug anymore. *I would suggest
> to check the destPattern variable for null, so at least a proper Exception
> (instead of NullPointerException) can be thrown*.
> I have no clue, why the problem occured on my linux system and the
> windows/eclipse configuration off my colleague, while it worked properly on
> mine.
> For debugging I checked out the current master branch
> (target.ivy.version=2.5.0), so the problem still exists there.
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