Jbpm4.4 deployment to Tomcat 6 troubleshooting

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 javax/el/ExpressionFactory used in the signature  org.apache.jsp.index_jsp._jspInit(index_jsp.java:23)  org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)  org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159)  org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)  org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)  org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)  javax.servlet.http.HttpServlet.service(HttpServlet.java:717)  org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88)  org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

The reason is that the three jar packages (juel. jar, WEB-INF, juel-engine.jar) and

Jar package (el-api.jar) Conflict in tomcat6 lib

Solution:

Copy the three juel. jar, juel-engine.jar, and juel-impl.jar packages to the tomcat6 Lib,

And delete tomcat/lib original el-api.jar, while the WEB-INF \ Lib in juel. jar, juel-engine.jar, juel-impl.jar can be deleted.

Jbpm4.4 deployment to Tomcat 6 troubleshooting