Hi
I'm trying to use ant to perform some operations outside a build process and
I'm having a problem dealing with nested elements.
First I made work the code found in the "writing tasks tutorial" at
http://ant.apache.org/manual/tutorial-writing-tasks.html#NestedElements. This
part is fine.
Now, what i've done, is put the same HelloWorld.java file, without any
modifications, in a jar built with maven (having ant ant ant-launcher as
dependencies). At execution the main class tries to launch the ant task using
the modified xml file like this :
<target name="use" description="Use the Task" >
<taskdef name="helloworld" classname="test.HelloWorld" />
<helloworld>
<message msg="Nested Element 1"/>
<message msg="Nested Element 2"/>
</helloworld>
</target>
and the code launching the task simply is (even if called in a different
thread):
ant = new Project();
helper = new ProjectHelperImpl();
setTaskProperties();
ant.addBuildListener(antTasksListener);
ant.init();
helper.parse(ant, antTaskFile);
ant.executeTarget(antTarget);
by doing this I get the following NullPointerException :
Caused by: java.lang.NullPointerException
at
org.apache.tools.ant.IntrospectionHelper.supportsNestedElement(IntrospectionHelper.java:642)
at
org.apache.tools.ant.UnknownElement.handleChild(UnknownElement.java:544)
at
org.apache.tools.ant.UnknownElement.handleChildren(UnknownElement.java:326)
at
org.apache.tools.ant.UnknownElement.configure(UnknownElement.java:182)
at
org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.java:158)
at org.apache.tools.ant.Task.perform(Task.java:363)
Then i guess there is a problem with the Nested Element in the HelloWorld.java
class, maybe with the classpath (i tried some things with it without any
result).
What I don't get is that if i change the xml File for
<target name="use" description="Use the Task" >
<taskdef name="helloworld" classname="test.HelloWorld" />
<helloworld message="someMessage">
</helloworld>
</target>
without changing the class, it works and the Task is properly executed. Then it
seems I can give a variable to my Task but not a nested element.
I'm using ant 1.6.5.
If someone has any ideas, i would be really gratefull.
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