jbpm4与struts2整合包冲突

jbpm4与struts2整合包冲突错误如下：

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: 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/login_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 javax/el/ExpressionFactory used in the signature
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:274)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause

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/login_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 javax/el/ExpressionFactory used in the signature
	org.apache.jsp.login_jsp._jspInit(login_jsp.java:21)
	org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:80)
	org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:157)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:320)
	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)

解决办法:
1。 juel.jar,juel-engine.jar,juel-impl.jar把jbpm下的这3个包剪切到tomcat/lib下。
2。 删除tomcat/lib/el-api.jar包

评论

2 楼 yizhl 2012-10-27  

That will happen when you include server-specific libraries of a different server make/version in the /WEB-INF/lib of your web application, such as jsp-api.jar, el-api.jar, servlet-api.jar, etc. You need to remove them all. The /WEB-INF/lib should not contain any server-specific libraries. They belongs in the specific server itself (Tomcat has them in its /lib folder already).

This is by the way a pretty common beginner's mistake whenever they encounter compilation errors on the JSP/Servlet API in their IDE project. This should have been solved differently, namely by integrating the server in the IDE and adding the server as "Target runtime" to the project.

1 楼 yefansiping 2011-08-18  

貌似不行啊