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From "Xavier Hanin" <xavier.ha...@gmail.com>
Subject Re: NPE whilst resolving transitive configurations.
Date Thu, 16 Aug 2007 18:37:31 GMT
On 8/16/07, Ross Clewley <ross.clewley@oracle.com> wrote:
>
> Hi
>
> I also see the following NullPointerException under similar conditions
> whilst resolving transitive configurations and can also be influenced by
> the order of the dependencies.
>
> java.lang.NullPointerException
>         at
> org.apache.ivy.core.resolve.ResolveEngine.downloadArtifacts(
> ResolveEngine.java:310)
>         at
> org.apache.ivy.core.resolve.ResolveEngine.resolve(ResolveEngine.java:271)
>         at
> org.apache.ivy.core.resolve.ResolveEngine.resolve(ResolveEngine.java:193)
>         at org.apache.ivy.Ivy.resolve(Ivy.java:256)
>         at org.apache.ivy.ant.IvyResolve.doExecute(IvyResolve.java:212)
>         at org.apache.ivy.ant.IvyTask.execute(IvyTask.java:281)
>
> I can't find that stack in jira. Do you think this is a related to the
> previous issue or needing it's own issue?


I think another stack deserves its own issue, with a link to the other one.
We'll mark all of them as resolved if fix them at once.

Thanks for reporting,

Xavier

thanks
>
> Ross
>
> Ross Clewley wrote:
> > Hi Xavier
> >
> > Thanks for taking a look. I've logged IVY-590.
> >
> > thanks
> >
> > Ross
> >
> > Xavier Hanin wrote:
> >
> >> On 8/15/07, Ross Clewley <ross.clewley@oracle.com> wrote:
> >>
> >>
> >>> Hi
> >>>
> >>> I should also say that this is with 1.4.1. I've tried with 2.0-alpha2
> >>> and I still get the NPE.
> >>>
> >>>
> >> I can't easily browse the 1.4.1 source right now, so I've just given a
> >> glance at the trunk, and you've found a pretty big issue:  in
> >> ResolveEngine.java:523 we call mark evicted with a null collection of
> >> selected module revisions, which is passed down to the EvictionData
> >> constructor which causes the NPE. This is pretty easy to solve though
> >> (adding a check for nullity in the constructor). Could you open an
> issue for
> >> that?
> >>
> >> Besides finding the problem in 2.x, this may also help to narrow down
> the
> >> problem in 1.4. Indeed we have no unit test testing the case handled by
> >> ResolveEngine.java:523, so it may be a cause of the NPE in 1.4 too.
> >>
> >> Xavier
> >>
> >> The stack this time is
> >>
> >>
> >>> java.lang.NullPointerException
> >>>         at
> >>> org.apache.ivy.core.resolve.IvyNodeEviction$EvictionData.<init>(
> >>> IvyNodeEviction.java:48)
> >>>         at
> >>> org.apache.ivy.core.resolve.IvyNodeEviction.markEvicted(
> >>> IvyNodeEviction.java:266)
> >>>         at
> >>> org.apache.ivy.core.resolve.IvyNode.markEvicted(IvyNode.java:1101)
> >>>         at
> >>> org.apache.ivy.core.resolve.ResolveEngine.getDependencies(
> >>> ResolveEngine.java:523)
> >>>         at
> >>> org.apache.ivy.core.resolve.ResolveEngine.resolve(ResolveEngine.java
> :236)
> >>>         at
> >>> org.apache.ivy.core.resolve.ResolveEngine.resolve(ResolveEngine.java
> :194)
> >>>         at org.apache.ivy.Ivy.resolve(Ivy.java:256)
> >>>         at org.apache.ivy.ant.IvyResolve.doExecute(IvyResolve.java
> :207)
> >>>         at org.apache.ivy.ant.IvyTask.execute(IvyTask.java:281)
> >>>         at
> >>> org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
> >>>         at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
> >>>         at
> >>> sun.reflect.DelegatingMethodAccessorImpl.invoke(
> >>> DelegatingMethodAccessorImpl.java:25)
> >>>         at java.lang.reflect.Method.invoke(Method.java:585)
> >>>         at
> >>> org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java
> >>> :105)
> >>>         at org.apache.tools.ant.Task.perform(Task.java:348)
> >>>         at org.apache.tools.ant.Target.execute(Target.java:357)
> >>>         at org.apache.tools.ant.Target.performTasks(Target.java:385)
> >>>         at
> >>> org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
> >>>         at org.apache.tools.ant.Project.executeTarget(Project.java
> :1298)
> >>>         at
> >>> org.apache.tools.ant.helper.DefaultExecutor.executeTargets(
> >>> DefaultExecutor.java:41)
> >>>         at org.apache.tools.ant.Project.executeTargets(Project.java
> :1181)
> >>>         at org.apache.tools.ant.Main.runBuild(Main.java:698)
> >>>         at org.apache.tools.ant.Main.startAnt(Main.java:199)
> >>>         at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
> >>>         at org.apache.tools.ant.launch.Launcher.main(Launcher.java
> :104)
> >>>
> >>> However, there is a slight difference in the behaviour. With
> 2.0-alpha2,
> >>> if I do the resolve a second time without cleaning the cache it works.
> >>> If I clean the cache again and do the resolve I get the NPE again.
> With
> >>> 1.4.1 I get it every time, regardless of whether the cache is clean or
> >>> not.
> >>>
> >>> regards
> >>>
> >>> Ross
> >>>
> >>> Ross Clewley wrote:
> >>>
> >>>
> >>>> Hi
> >>>>
> >>>> I need some help sorting out a NullPointerException that I'm getting
> >>>> during resolution. The stack looks like this.
> >>>>
> >>>> java.lang.NullPointerException
> >>>>        at fr.jayasoft.ivy.IvyNode.isEvicted(IvyNode.java:367)
> >>>>        at fr.jayasoft.ivy.IvyNode.loadData(IvyNode.java:590)
> >>>>        at fr.jayasoft.ivy.Ivy.fetchDependencies(Ivy.java:1417)
> >>>>        at fr.jayasoft.ivy.Ivy.fetchDependencies(Ivy.java:1443)
> >>>>        at fr.jayasoft.ivy.Ivy.doFetchDependencies(Ivy.java:1492)
> >>>>        at fr.jayasoft.ivy.Ivy.fetchDependencies(Ivy.java:1424)
> >>>>        at fr.jayasoft.ivy.Ivy.doFetchDependencies(Ivy.java:1492)
> >>>>        at fr.jayasoft.ivy.Ivy.fetchDependencies(Ivy.java:1424)
> >>>>        at fr.jayasoft.ivy.Ivy.doFetchDependencies(Ivy.java:1492)
> >>>>        at fr.jayasoft.ivy.Ivy.fetchDependencies(Ivy.java:1433)
> >>>>        at fr.jayasoft.ivy.Ivy.doFetchDependencies(Ivy.java:1476)
> >>>>        at fr.jayasoft.ivy.Ivy.fetchDependencies(Ivy.java:1424)
> >>>>        at fr.jayasoft.ivy.Ivy.getDependencies(Ivy.java:1343)
> >>>>        at fr.jayasoft.ivy.Ivy.resolve(Ivy.java:1136)
> >>>>        at fr.jayasoft.ivy.Ivy.resolve(Ivy.java:1093)
> >>>>        at fr.jayasoft.ivy.ant.IvyResolve.execute(IvyResolve.java:167)
> >>>>
> >>>> I'd like to be able to figure out a minimal testcase to reproduce
> this
> >>>> so I can log a Jira issue and also hopefully work around it. The
> >>>> trouble is I'm having problems figuring out what that minimal
> testcase
> >>>> is. The problem occurs with certain sets of dependencies and can go
> >>>> away again when those dependencies are changed, or even when the
> >>>> dependencies are re-ordered. I'm hoping someone may be able to give
> me
> >>>> some pointers about what to look at to help nail this down a bit more
> >>>> firmly.
> >>>>
> >>>> The problem occurs whilst resolving transitive configurations. We
> have
> >>>> a build systems comprising 170 or so modules, each of which have the
> >>>> following configurations
> >>>>
> >>>>    <conf name="default"   extends="package" transitive="true"/>
> >>>>    <conf name="compile"   extends="default" visibility="private"
> >>>> transitive="false"/>
> >>>>    <conf name="runtime"   extends="default" visibility="public"
> >>>> transitive="true"/>
> >>>>    <conf name="test"      extends="runtime"/>
> >>>>
> >>>> These modules declare dependencies amongst themselves or third party
> >>>> dependencies in their own filesystem repository with Ivy files that
> >>>> just have the default conf. Incase it's relevant the
> >>>> defaultconfmapping used throughout is "compile->default(*);*->@(*)".
> >>>>
> >>>> It's when resolving the transitive runtime of test configurations
> that
> >>>> the NPE occurs.
> >>>>
> >>>> It's difficult for me to give you a selection of the modules and
> their
> >>>> dependencies that cause the problem as there would be too many. That
> >>>> is why I want to try to understand the issue better and produce that
> >>>> minimal testcase. Any ideas?
> >>>>
> >>>> thanks
> >>>>
> >>>> Ross
> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>>
> >>
> >>
> >
> >
> >
>
>


-- 
Xavier Hanin - Independent Java Consultant
http://xhab.blogspot.com/
http://incubator.apache.org/ivy/
http://www.xoocode.org/

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