Java processor error

Hi all, I'm the newbie in OPS. So i only try existing samples. When i call >java -jar "path_to_orbeon\WEB-INF\cli-ops.jar" -r . oxf:/parse.xpl
of example "path_to_orbeon\cli-examples\java". I got these errors:


Starting Orbeon XML Server 3.0.0.200601132127 Initializing Resource Manager with: {oxf.resources.priority.2=org.orbeon.oxf.resources.ClassLoaderResourceManagerFactory , oxf.resources.factory=org.orbeon.oxf.resources.PriorityResourceManagerFactory, oxf.resources.filesystem.sandbox-direct ory=., oxf.resources.priority.1=org.orbeon.oxf.resources.FilesystemResourceManagerFactory}
2006-02-21 15:36:59,524 INFO org.orbeon.oxf.main.OPS null - Running processor
2006-02-21 15:36:59,712 ERROR org.orbeon.oxf.main.OPS null - Exception at oxf:/parse.xpl, line 35, column 43, description reading processor output java.lang.NullPointerException at org.orbeon.oxf.util.SystemUtils.gatherSystemPaths(SystemUtils.java:71)
at org.orbeon.oxf.util.SystemUtils.pathFromLoaders(SystemUtils.java:102)
at org.orbeon.oxf.processor.JavaProcessor.buildClassPath(JavaProcessor.java:396)
at org.orbeon.oxf.processor.JavaProcessor.getProcessor(JavaProcessor.java:195)
at org.orbeon.oxf.processor.JavaProcessor.start(JavaProcessor.java:95)
.......
I don't understand why. May i forget some configurations? I'm using jdk_1.6/orbeon 3.01. Does it make problems? Any help?

Thank you, hoangle