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Posted to users@maven.apache.org by Anand Ganesh <aa...@hotmail.com> on 2010/10/14 23:13:27 UTC

Newbie qn: ant-maven build failure: UnknownElement / NullPointerException

Hi,

I'm a newbie to Ant & Maven (and much of the LAMP stack), and I'm trying to understand this build failure. Most likely it's a setup-install issue, except I don't know what exactly, and how to fix it. Any pointers on making progress much appreciated. Please include me on replies as I don't subscribe to this mailing list.

anand@Anand$ ant -buildfile buildtest.xml nothing
Buildfile: buildtest.xml

BUILD FAILED
java.lang.NullPointerException
    at org.apache.maven.artifact.ant.AbstractArtifactTask.diagnoseError(AbstractArtifactTask.java:395)
    at org.apache.maven.artifact.ant.AbstractArtifactTask.execute(AbstractArtifactTask.java:473)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    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:357)
    at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:142)
    at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:93)
    at org.apache.tools.ant.Main.runBuild(Main.java:743)
    at org.apache.tools.ant.Main.startAnt(Main.java:217)
    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)

Total time: 0 seconds

buildtest.xml:
<project name="LiveMocha" default="nothing" basedir="." xmlns:artifact="antlib:org.apache.maven.artifact.ant">

    <artifact:dependencies pathId="dependency.classpath" filesetId="dependency.fileset">
    </artifact:dependencies>
    <property name="dependency.classpath" refid="dependency.classpath" />

    <target name="nothing">
        <echo message="Do nothing" />
    </target>
</project>

Thanks,
Anand.