jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class

启动项目时，日志显示：

五月 31, 2016 1:54:06 下午 org.apache.catalina.loader.WebappClassLoaderBase validateJarFile

信息: validateJarFile(D:\workspaceBole\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\ecp\WEB-INF\lib\juel-2.1.3.jar) - jar not loaded.

See Servlet Spec 3.0, section 10.7.2. Offending class: javax/el/Expression.class

。。。

严重: Exception starting filter jfinal

java.lang.NoClassDefFoundError: de/odysseus/el/util/SimpleContext

报错是因为找不到SimpleContext，而这个类正是juel-2.1.3.jar中的，上文显示此jar not loaded.

解决办法：将此juel-2.1.3.jar，放入tomcat的jar文件夹

原因分析：Servlet Spec 3.0, section 10.7.2 原文节选

As described in the Java EE license agreement, servlet containers that are not part of a Java EE product should not allow
the application to override Java SE platform classes, such as those in the java.* and javax.* namespaces, that Java SE does not allow to be modified.

大意：禁止重写 java.* and javax.*

分析：反编译后查看那个jar发现重写了javax.* ，所以被禁止加载。

延伸：网上说报此错，还有可能是项目的WEB-INF/lib下有servlet-api.jar 或 jsp-api.jar，

或项目的WEB-INF/lib下有包含javax.servlet包的JAR包（如WebLogic 8.1的weblogic.jar），

网上说是因为：与tomcat的jar重复或冲突

所以推测此类问题应该是同一问题，可以参考此思路解决。

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