I have three freeform projects; DOIStudio, DOI and
Effie. DOIStudio uses DOI and Effie. DOI uses Effie.

I can never set breakpoints in the current
project, nor in the JDK.

When debugging DOIStudio, I can set breakpoints in
DOI.

When debugging DOI, I can set breakpoints in Effie.

In all cases, the breakpoints are listed correctly
in the Breakpoints window. I can use "Go To
Source", so NetBeans has no problem locating the
source. (How NetBeans does that is beyond me since
there is AFAIK no way to specify, in project.xml,
where the source for dependent libraries can be
found.)

In other words, it LOOKS like the breakpoints are
set correctly, its just that the debugger never
stops on them.

This is the Ant task used to start the debugger:

    <target name="debug" depends="compile"
if="netbeans.home" description="Debug Project">
		<fail message="Property 'main.class' not set."
unless="main.class"/>
		<fail message="Property 'run.jvmargs' not set."
unless="run.jvmargs"/>
		<fail message="Property 'application.args' not
set." unless="application.args"/>
        <nbjpdastart name="${main.class}"
addressproperty="jpda.address" transport="dt_socket">
			<classpath>
				<path refid="run.classpath"/>
			</classpath>
		</nbjpdastart>
		<java classname="${main.class}" fork="true">
			<jvmarg value="-Xdebug"/>
			<jvmarg value="-Xnoagent"/>
			<jvmarg value="-Djava.compiler=none"/>
			<jvmarg
value="-Xrunjdwp:transport=dt_socket,address=${jpda.address}"/>
			<jvmarg line="${run.jvmargs}"/>
			<classpath>
				<path refid="run.classpath"/>
			</classpath>
			<arg line="${application.args}"/>
		</java>
	</target>