在开发Tomcat应用时，难免有各种错误，但错误不能在发布时显示，需要采取措施屏蔽。
在WEB-INF目录下web.xml中加入如下代码，即可实现常见出错屏蔽。
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<ERROR-PAGE><ERROR-CODE>404</ERROR-CODE><LOCATION>/error/error404.jsp</LOCATION></ERROR-PAGE>
<ERROR-PAGE><ERROR-CODE>400</ERROR-CODE><LOCATION>/error/error400.jsp</LOCATION></ERROR-PAGE>
<ERROR-PAGE><ERROR-CODE>500</ERROR-CODE><LOCATION>/error/error500.jsp</LOCATION></ERROR-PAGE>
<ERROR-PAGE><ERROR-CODE>503</ERROR-CODE><LOCATION>/error/error503.jsp</LOCATION></ERROR-PAGE>
<ERROR-PAGE><EXCEPTION-TYPE>java.lang.Exception</EXCEPTION-TYPE><LOCATION>/error/error500.jsp</LOCATION></ERROR-PAGE>
<ERROR-PAGE><EXCEPTION-TYPE>java.lang.NullPointerException</EXCEPTION-TYPE><LOCATION>/error/nullpointer.jsp</LOCATION></ERROR-PAGE>
<ERROR-PAGE><EXCEPTION-TYPE>java.lang.ClassNotFoundException</EXCEPTION-TYPE><LOCATION>/error/classnotfound.jsp</LOCATION></ERROR-PAGE>
<ERROR-PAGE><EXCEPTION-TYPE>java.lang.NoClassDefFoundError</EXCEPTION-TYPE><LOCATION>/error/classnotfound.jsp</LOCATION></ERROR-PAGE>
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