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From: Mark Womack <mwomack@bevocal.com>
To: "'ant-user@jakarta.apache.org'" <ant-user@jakarta.apache.org>
Subject: Error with the foreach task
Date: Mon, 2 Jul 2001 11:47:32 -0700 
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This is probably something obvious that I am missing.  But I have defined
the following targets:

<taskdef name="foreach"
classname="org.apache.tools.ant.taskdefs.optional.ForeachTask"/>
<target name="build_experimental" depends="init, prepare_dirs">
  <foreach target="build_experimental_dir" type="dir">
    <param name="src.subdir">
      <fileset dir="${build.java}" includes="*"/>
    </param>
  </foreach>
</target>

<target name="build_experimental_dir">
  <javac srcdir="${build.java}"
         destdir="${build.classes}"
         includes="${src.subdir}/*.java"
         classpath="${CLASSPATH}">
    <patternset excludesfile="${build.java}/build_excludes" />
  </javac>
</target>

Took me a while to figure out I needed to add the <taskdef>.  But after
adding that, I still get the following error:

build_experimental:

BUILD FAILED

java.lang.NullPointerException
        at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:206)
        at
org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:103)
        at
org.apache.tools.ant.taskdefs.optional.ForeachTask.executeTarget(Fore
achTask.java:246)
        at
org.apache.tools.ant.taskdefs.optional.ForeachTask.executeParameters(
ForeachTask.java:263)
        at
org.apache.tools.ant.taskdefs.optional.ForeachTask.executeParameters(
ForeachTask.java:273)
        at
org.apache.tools.ant.taskdefs.optional.ForeachTask.execute(ForeachTas
k.java:284)
        at org.apache.tools.ant.Target.execute(Target.java:153)
        at org.apache.tools.ant.Project.runTarget(Project.java:898)
        at org.apache.tools.ant.Project.executeTarget(Project.java:536)
        at org.apache.tools.ant.Project.executeTargets(Project.java:510)
        at org.apache.tools.ant.Main.runBuild(Main.java:421)
        at org.apache.tools.ant.Main.main(Main.java:149)

It is unclear to me what is causing the null pointer exception.  Is there
something I can turn on in ant that will help me debug this?  Does anyone
see an obvious problem with the task definitions or the way I am using
<foreach> that I am missing?

Thanks!
-Mark