摘要： 异常:java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/Expression......jbpm4 在tomcat6 下面错误！项目中的三个jar包和tomcat6下lib中jar包(el-api.jar)冲突juel.jar, juel-engine.jar, juel-impl.jar解决方法：一：换成tomcat5. 阅读全文