how to show a longer stack trace on the report

I use a junit ant task to test an EJB (on JBoss), i set my test method 
to throws Excpetion, so it appears on the report. But it show just the 
first level on the stack trace :



java.lang.NullPointerException
at 
br.com.sicredi.cobranca.tests.CobrancaFacadeEJBTest.testInsercao(CobrancaFacadeEJBTest.java:63)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

how do I set it to show a lower level of the stacktrace, or to to show 
in the junit console?????