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## org.apache.commons.lang
Class NullArgumentException

    java.lang.Object
      java.lang.Throwable
          java.lang.Exception
              java.lang.RuntimeException
                  java.lang.IllegalArgumentException
                      org.apache.commons.lang.NullArgumentException

All Implemented Interfaces:
  Serializable

    public class NullArgumentException

extends IllegalArgumentException

Thrown to indicate that an argument was `null` and should not have been. This exception supplements the standard `IllegalArgumentException` by providing a more semantically rich description of the problem.

`NullArgumentException` represents the case where a method takes in a parameter that must not be `null`. Some coding standards would use `NullPointerException` for this case, others will use `IllegalArgumentException`. Thus this exception would be used in place of `IllegalArgumentException`, yet it still extends it.

     public void foo(String str) {
       if (str == null) {
         throw new NullArgumentException("str");
       }
       // do something with the string
     }

Since:
  2.0
Version:
  $Id: NullArgumentException.java 905636 2010-02-02 14:03:32Z niallp $
Author:
  Apache Software Foundation, Matthew Hawthorne
See Also:
  Serialized Form

Constructor Summary
`NullArgumentException(String argName)` Instantiates with the given argument name.

Method Summary

Methods inherited from class java.lang.Throwable
`fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### NullArgumentException

    public NullArgumentException(String argName)

  Instantiates with the given argument name.

  Parameters:
    `argName` - the name of the argument that was `null`.

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