I am trying to build Jboss on HP-UX . I am getting the following error . Can anyone help me with this .

file:/depot/jboss-3.2.0-src/server/build.xml:405: Failed to launch JJTree at org.apache.tools.ant.taskdefs.optional.javacc.JJTree.execute(JJTree.java:268) at org.apache.tools.ant.Task.perform(Task.java:341)