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From "Kevin Jackson" <foamd...@gmail.com>
Subject NestedElement weirdness
Date Wed, 09 May 2007 16:41:50 GMT
Hi all,

I've just spent a hugely frustrating 2 hours or so trying to get a
simple nested element to work within a task.

-addElementName(ObjectType t) fails (task doesn't support nested element)
-addConfiguredElementName(ObjectType t) fails
-createElementName works

Here's pretty much the exact code from the ant manual

import org.apache.tools.ant.Task;
import org.apache.tools.ant.BuildException;

import java.util.Vector;
import java.util.Enumeration;
/* from http://ant.apache.org/manual/develop.html#nested-elements
 * & http://ant.apache.org/manual/tutorial-writing-tasks.html
 */
public class EchoTest extends Task {
    private Vector messages = new Vector();


    public void execute() throws BuildException {
        for(Enumeration e = messages.elements(); e.hasMoreElements();) {
            getProject().log("MSG: "+((Message)e.nextElement()).getMessage());
        }
    }

// works
//    public Message createMessage() {
//        Message m = new Message();
//        messages.add(m);
//        return m;
//    }

//doesn't
    public void addMessage(Message m) {
        messages.add(m);
    }

    public class Message {
        private String message;
        public Message() {}

        public String getMessage() {
            return message;
        }

        public void setMessage(String message) {
            this.message = message;
        }
    }
}

and my build.xml:

<?xml version="1.0"?>
<project name="test-dpkg" basedir=".">
    <target name="init">
        <taskdef name="my-echo"
          classname="org.apache.tools.ant.taskdefs.optional.dpkg.EchoTest"
        />
    </target>

    <target name="test" depends="init">
      <my-echo>
        <message message="1"/>
        <message message="2"/>
      </my-echo>
    </target>
</project>

output:
kev@ubuntu-dev:~/IdeaProjects/ant-core-trunk$ ant -debug -f
test-control-file.xml test
Apache Ant version 1.7.1alpha compiled on May 9 2007
Buildfile: test-control-file.xml
Adding reference: ant.PropertyHelper
Detected Java version: 1.6 in: /usr/lib/jvm/java-6-sun-1.6.0.00/jre
Detected OS: Linux
Adding reference: ant.ComponentHelper
Setting ro project property: ant.file ->
/home/kev/IdeaProjects/ant-core-trunk/test-control-file.xml
Adding reference: ant.projectHelper
Adding reference: ant.parsing.context
Adding reference: ant.targets
parsing buildfile
/home/kev/IdeaProjects/ant-core-trunk/test-control-file.xml with URI =
file:/home/kev/IdeaProjects/ant-core-trunk/test-control-file.xml
Setting ro project property: ant.project.name -> test-dpkg
Adding reference: test-dpkg
Setting ro project property: ant.file.test-dpkg ->
/home/kev/IdeaProjects/ant-core-trunk/test-control-file.xml
Project base dir set to: /home/kev/IdeaProjects/ant-core-trunk
 +Target:
 +Target: init
 +Target: test
Attempting to create object of type org.apache.tools.ant.helper.DefaultExecutor
Adding reference: ant.executor
Build sequence for target(s) `test' is [init, test]
Complete build sequence is [init, test, ]

init:
[antlib:org.apache.tools.ant] Could not load definitions from resource
org/apache/tools/ant/antlib.xml. It could not be found.
Class org.apache.tools.ant.taskdefs.optional.dpkg.ControlFileTask
loaded from parent loader (parentFirst)
 +Datatype control org.apache.tools.ant.taskdefs.optional.dpkg.ControlFileTask
Class org.apache.tools.ant.taskdefs.optional.dpkg.EchoTest loaded from
parent loader (parentFirst)
 +Datatype my-echo org.apache.tools.ant.taskdefs.optional.dpkg.EchoTest

test:

BUILD FAILED
/home/kev/IdeaProjects/ant-core-trunk/test-control-file.xml:18:
my-echo doesn't support the nested "message" element.
        at org.apache.tools.ant.UnknownElement.handleChildren(UnknownElement.java:356)
        at org.apache.tools.ant.UnknownElement.configure(UnknownElement.java:198)
        at org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.java:160)
        at org.apache.tools.ant.Task.perform(Task.java:347)
        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:1331)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1300)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1183)
        at org.apache.tools.ant.Main.runBuild(Main.java:758)
        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)
Caused by: The <my-echo> type doesn't support the nested "message" element.
        at org.apache.tools.ant.IntrospectionHelper.throwNotSupported(IntrospectionHelper.java:480)
        at org.apache.tools.ant.IntrospectionHelper.getNestedCreator(IntrospectionHelper.java:545)
        at org.apache.tools.ant.IntrospectionHelper.getElementCreator(IntrospectionHelper.java:608)
        at org.apache.tools.ant.UnknownElement.handleChild(UnknownElement.java:543)
        at org.apache.tools.ant.UnknownElement.handleChildren(UnknownElement.java:343)
        ... 13 more
--- Nested Exception ---
The <my-echo> type doesn't support the nested "message" element.
        at org.apache.tools.ant.IntrospectionHelper.throwNotSupported(IntrospectionHelper.java:480)
        at org.apache.tools.ant.IntrospectionHelper.getNestedCreator(IntrospectionHelper.java:545)
        at org.apache.tools.ant.IntrospectionHelper.getElementCreator(IntrospectionHelper.java:608)
        at org.apache.tools.ant.UnknownElement.handleChild(UnknownElement.java:543)
        at org.apache.tools.ant.UnknownElement.handleChildren(UnknownElement.java:343)
        at org.apache.tools.ant.UnknownElement.configure(UnknownElement.java:198)
        at org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.java:160)
        at org.apache.tools.ant.Task.perform(Task.java:347)
        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:1331)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1300)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1183)
        at org.apache.tools.ant.Main.runBuild(Main.java:758)
        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)

I've been working on something more complex than this and couldn't get
the nested elements to work, so I went back to the most basic task I
could think of - the addElementName methods don't seem to work on svn
trunk - which is obviously not true as this code is used throughout
the codebase.

Can anyone see what I'm doing wrong here, or indeed reproduce what I'm
seeing (and really not being able to believe right now). I know I'm
dumb, but this shouldn't be that hard :(

Kev

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