java.lang.ClassCastException: de.odysseus.el.ExpressionFactoryImpl cannot be cast to javax.el.Expres

spring+maven项目整合activiti在使用maven build启动时报包冲突错误。java.lang.ClassCastException: de.odysseus.el.ExpressionFactoryImpl cannot be cast to javax.el.ExpressionFactory（Tomcat中单独启动并没有报该错误）

原因：jar重复出现冲突，el-api.jar 和 juel-api.jar

解决：删掉其中一个即可。

如下pom文件中排除juel-api包，后正常启动

<dependency>
           <groupId>org.activiti</groupId>
           <artifactId>activiti-engine</artifactId>
           <version>6.0.0</version>
           <exclusions>
               <exclusion>
                   <groupId>de.odysseus.juel</groupId>
                   <artifactId>juel-api</artifactId>
               </exclusion>
           </exclusions>
       </dependency>

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java.lang.ClassCastException: de.odysseus.el.ExpressionFactoryImpl cannot be cast to javax.el.Expres

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