class 'Bean.LoginBean' could not be loaded
以前用Tomcat测试的工程，现在将其导入服务器配置为weblogic的Myeclipse中却无法运行，错误提示如下：

<2012-5-7 下午08时08分56秒 CST> <Error> <HTTP> <BEA-101020> <[ServletContext(id=27928091,name=ShopOnline,context-path=/ShopOnline)] Servlet failed with Exception

weblogic.servlet.jsp.JspException: (line 3): class 'Bean.LoginBean' could not be loaded
  at weblogic.servlet.jsp.JspLexer.jspException(JspLexer.java:712)
at weblogic.servlet.jsp.JspLexer.processBeanTag(JspLexer.java:1398)
at weblogic.servlet.jsp.JspLexer.mXML_OPEN_USEBEAN(JspLexer.java:3700)
at weblogic.servlet.jsp.JspLexer.mXML_THING(JspLexer.java:1999)
at weblogic.servlet.jsp.JspLexer.mTOKEN(JspLexer.java:1892)
at weblogic.servlet.jsp.JspLexer.nextToken(JspLexer.java:1820)
at weblogic.servlet.jsp.JspLexer.parse(JspLexer.java:963)
at weblogic.servlet.jsp.JspParser.doit(JspParser.java:106)
at weblogic.servlet.jsp.JspParser.parse(JspParser.java:234)
at weblogic.servlet.jsp.Jsp2Java.outputs(Jsp2Java.java:125)
at weblogic.utils.compiler.CodeGenerator.generate(CodeGenerator.java:258)
at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java:396)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:246)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:196)
at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:598)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:406)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:348)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6981)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3892)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2766)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
> 

怎么解决啊 纠结了一天了！望大侠赐教！！！

------解决方案--------------------
比较难解决，以前遇到过类似的问题，最终发现是同一的标签写法，在不同服务器间兼容性不好