maven 整合SSH模块时，在父工程里面执行tomcat7:run时，服务器端测试正常，但是页面响应时，出现如下问题：

HTTP Status 500 - 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/codehaus/plexus/classworlds/realm/ClassRealm) for the method's defining class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature

原因是SSH父工程的pom.xml配置文件配置出错，注意配置文件中依赖(dependency)是有顺序的，修改依赖的顺序就可以了。

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