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From Mark Womack <mwom...@bevocal.com>
Subject RE: Error with the foreach task
Date Mon, 02 Jul 2001 23:50:05 GMT
I did a little more digging into the exception.  Line 206 in Ant.java is
this:

  // Are we trying to call the target in which we are defined?
  if (p1.getBaseDir().equals(project.getBaseDir()) &&
      p1.getProperty("ant.file").equals(project.getProperty("ant.file")) &&
      target.equals(this.getOwningTarget().getName())) { 
         throw new BuildException("ant task calling its own parent target");
  }

I'm guessing, from looking at the surrounding code, that the p1.getBaseDir()
call is returning null.  This suggests that something is not set up
correctly when calling the target from the <foreach> tag?  My <project> has
a basedir attribute of ".".

I have tried embedding <echo> tags in the target called by foreach, but
nothing gets printed.  I tried other tasks besides javac, and they crash
with the same error.

So, I am stumped.  I am using Ant 1.3.  Is that an issue?

Thanks,
-Mark

-----Original Message-----
From: Mark Womack 
Sent: Monday, July 02, 2001 11:48 AM
To: 'ant-user@jakarta.apache.org'
Subject: Error with the foreach task


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

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