@SuppressWarnings("null")
    @Override
    public void start(CoprocessorEnvironment e) throws IOException {
      // Trigger a NPE to fail the coprocessor
      Integer i = null;
      i = i + 1;
    }
Tests unhandled exceptions thrown by coprocessors running on a regionserver.. Expected result is
that the regionserver will abort with an informative error message describing the set of its
loaded coprocessors for crash diagnosis. (HBASE-4014).
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestRegionServerCoprocessorExceptionWithAbort.java