Getting “ArrayIndexOutOfBoundsException: null” with NO stack trace

1. String concatenated with a null reference might get you such a message:

   Object obj = null;
   throw new ArrayIndexOutOfBoundsException("" + obj);
   

2. If you’re using an Oracle JVM you may want to add -XX:-OmitStackTraceInFastThrow as an additional parameter to see if it helps. For some basic exceptions, the JVM reuses the same exception instance after a while, in which case there’s no stack trace anymore. This option prevents the reuse, so you always get a stack trace.

Edit note: this last could also apply to a recent version of OpenJDK (e.g., 1.8)