本文主要是介绍Dorado7无法打开JSP的问题 have different Class objects for the type avax/el/ExpressionFactory，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
解决办法：
删除lib中jar包：el-api.jar
问题根源：包冲突引起的，这个类javax/el/ExpressionFactory，在myeclipse的javaee.jar中有，在tomcat的el-api.jar中有，在jpbm的juel.jar中有。
报错如下：
java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type avax/el/ExpressionFactory; used in the signature
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