JDT batch compiler with Cruise-Control ANT

Hello,
I am relatively new to Cruise-Control and I am playing around with it, but
now I am stuck to a problem:
I want to use the JDT batch compiler in an ant script which is started from
Cruise-Control. It it working when I start the ant script outside from
Cruise-Control, using the installed ant on my computer. To get it work I had
to add the property
    <property name="build.compiler"
value="org.eclipse.jdt.core.JDTCompilerAdapter" />
and to add the Compiler jar ecj-3.4.jar to my ants lib directory. 

Now when I try the same from Cruise-Control, I keep getting the error
message: (begin of stack trace)
Caused by: E:\build_cc.xml:83: Class not found:
org.eclipse.jdt.core.JDTCompilerAdapter
	at
org.apache.tools.ant.util.ClasspathUtils.newInstance(ClasspathUtils.java:277)
	at
org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.resolveClassName(CompilerAdapterFactory.java:171)
	at
org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java:136)
	at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:990)
	at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:820)

I noticed that Cruise-Control has its own ant in the programm directory, and
I also added ecj-3.4.jar to the ant lib dir of Cruise-Control, but obviously
this didn't do the trick. I also tried to add it directly to Cruise-Controls
lib directory, but then I got the error message 

E:\build_cc.xml:83: java.lang.NoSuchFieldError: EMPTY_STRING
	at
org.apache.tools.ant.ProjectHelper.addLocationToBuildException(ProjectHelper.java:541)
	at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:418)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.Target.execute(Target.java:357)

Does anyone have an idea what I am doing wrong...?

Greetings, 
Thorsten


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