1_null_pointer_exception.html">NullPointerException</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Thrown when an application attempts to use null in a case where an object is required.  <a href="classlog4cxx_1_1helpers_1_1_null_pointer_exception.html#_details">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">class &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1helpers_1_1_illegal_argument_exception.h