JSP [Class org.apache.commons.logging.LogFactory not found in import] 错误

各位大虾帮忙看看这是什么错误,刚接触JSP,用的是别人的程序,请大虾指点,感激不尽!


500 Servlet Exception
Note: sun.tools.javac.Main has been deprecated.
E:\resin-ee-2.1.4\webapps\itsq\WEB-INF\classes\com\util\SequenceManage.java:3:
Class org.apache.commons.logging.LogFactory not found in import.
import org.apache.commons.logging.LogFactory;
^
E:\resin-ee-2.1.4\webapps\itsq\WEB-INF\classes\com\util\SequenceManage.java:4:
Class org.apache.commons.logging.Log not found in import.
import org.apache.commons.logging.Log;
^
2 errors, 1 warning

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Resin 2.1.4 (built Fri Aug 2 14:16:52 PDT 2002)