Catch NullPointerException

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ASDR Table of Contents

Last revision (mm/dd/yy): 02/17/2009


It is generally a bad practice to catch NullPointerException.

Programmers typically catch NullPointerException under three circumstances:

  1. The program contains a null pointer dereference. Catching the resulting exception was easier than fixing the underlying problem.
  2. The program explicitly throws a NullPointerException to signal an error condition.
  3. The code is part of a test harness that supplies unexpected input to the classes under test.

Of these three circumstances, only the last is acceptable.

Risk Factors



The following code mistakenly catches a NullPointerException.

	  try {
	  catch (NullPointerException npe) {

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