indirizzando JAVA_PATH in /usr/lib/jvm/java

ho questo output

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.catalina.startup.Bootstrap.stopServer(B ootstrap.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstr ap.java:415)
Caused by: java.lang.NullPointerException
at org.apache.catalina.startup.Catalina.stopServer(Ca talina.java:394)
... 6 more


che significa ?