jbpm4.4在jetty6下的ClassCastException

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在pom.xml中加入jBPM4.4的支持, 用jetty6跑的时候发现, 在jsp中只要使用EL就会报:

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

 

后来在jbpm-4.4.pom中发现这样一段话:

The juel engine is the library from scripting.java.sun.com that exposes juel as a jsr233 scripting engine. It's not part of the juel distribution. For some reason i don't recall, we uploaded it as an juel-engine artifact in the group juel. And more problematic, used the juel version (2.1.0) for it. That is not intuitive.

怀疑是这个问题,于是在jbpm-pvm下排除:

   org.jbpm.jbpm4
   jbpm-pvm
   4.4
   
    
     juel
     juel-engine
    
    
     juel
     juel-api
    
    
     juel
     juel-impl
    
   
  

 

问题解决.