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java.lang.NullPointerException: 	at com.cenqua.clover.instr.Instrumenter.startInstrumentation(Instrumenter.java:82)	at com.cenqua.clover.instr.Instrumenter.startInstrumentation(Instrumenter.java:70)	at org.apache.tools.ant.taskdefs.CloverCompilerAdapter.setJavac(CloverCompilerAdapter.java:336)	at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1062)	at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:882)	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:106)	at org.apache.tools.ant.Task.perform(Task.java:348)	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:1337)