MySQL 连接问题

本来我用MyEcplise 5.X + Tomcat 5.X 配置好的一个MySQL连接.是可以连接到MySQL的,
但是最近把MyEcplise升级到6.0的时候就出问题了.原来的MySql驱动不变,但是当运行到
Class.forName("com.jdbc.mysql.Dirver");
的时候就会出现
javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/aspectj/lang/Signature
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:855)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:784)
org.apache.jsp.conn_jsp._jspService(conn_jsp.java:123)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
请教大家有何解决方法~