Tomcat6环境JBPM4.3报错：java.lang.ClassNotFoundException: de.odysseus.el.util.SimpleResolver

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原文链接：http://www.cnblogs.com/jadmin/archive/2010/07/21/2205983.html

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#java

本文解决在使用JBPM4集成到应用中时遇到的与Tomcat6的冲突问题，主要原因是el-api.jar与juel.jar版本不兼容导致的重复导入错误。建议使用Tomcat5.5或替换el-api.jar为juel.jar，并移除重复的juel.jar以解决此问题。

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Requirements

JUEL requires Java 5 or later.

加入juel.jar

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I think I get same problem when trying to integrate JBPM4 into my app. And I find out why.
Because you're using Tomcat 6.0... The lib el-api.jar in %tomcat_home%/lib conflicts with juel.jar, which exists in %jbpm4_home%/lib.

juel: <http://juel.sourceforge.net/> You will find the 2 jars define the same api for javax/el/ExressionFactory.

The solution is that you use Tomcat 5.5 instead of Tomcat 6.0. Because tomcat 5.5 uses commons-el.jar (Tomcat5.5/common/lib)

Or you can still use Tomcat 6.0, but you must replace el-api.jar with juel.jar. And don't forget to remove juel.jar from your app lib(A duplicate import, if you don't remove).

Try it!

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解决：删掉tomcat6的el.jar，加入juel.jar,juel-impl.jar,juel-engine.jar