ProcessEngine cannot be jbpm org.apache.jasper.JasperException: Unable to compile class for JSP:

jbpm4.4  tomcat6.x myelipse8.6


ProcessEngine cannot be jbpm org.apache.jasper.JasperException: Unable to compile class for JSP:

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/deploy_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


lib目录下的三个jar包删除
juel-api.jar   (准确的讲应该只要删除这一个jar包即可,因为他跟juel-api.jar和tomcat下的el-api.jar的内容是一样的,因为有冲突所以报错)
juel-engine.jar

juel-impl.jar

有时候出一些莫名其妙的的错误是因为tomcat没有启动,自己本身直接运行 流程定义

org.jbpm.api.JbpmException: error: parsing exception: expression factory cla


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