在启动Tomcat时出现了如下的错误：

警告: Could not create JarEntryRevision for [jar:file:/E:/Programming/apache-tomcat-6.0.26/webapps/Struts2/WEB-INF/lib/struts2-core-2.2.1.jar]

...

2010-9-24 11:16:02 com.opensymphony.xwork2.util.logging.jdk.JdkLogger info

信息: Parsing configuration file [struts-default.xml]

2010-9-24 11:16:02 com.opensymphony.xwork2.util.logging.jdk.JdkLogger error

严重: Dispatcher initialization failed

Unable to load configuration. - bean - jar:file:/E:/Programming/apache-tomcat-6.0.26/webapps/Struts2/WEB-INF/lib/struts2-core-2.2.1.jar!/struts-default.xml:48:178

    ...

Caused by: Unable to load bean: type:org.apache.struts2.dispatcher.multipart.MultiPartRequest class:org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest - bean - jar:file:/E:/Programming/apache-tomcat-6.0.26/webapps/Struts2/WEB-INF/lib/struts2-core-2.2.1.jar!/struts-default.xml:48:178

    ...

Caused by: java.lang.NoClassDefFoundError: org/apache/commons/fileupload/RequestContext

    ...

2010-9-24 11:16:02 org.apache.catalina.core.StandardContext filterStart

严重: Exception starting filter struts2

Unable to load configuration. - bean - jar:file:/E:/Programming/apache-tomcat-6.0.26/webapps/Struts2/WEB-INF/lib/struts2-core-2.2.1.jar!/struts-default.xml:48:178

    ...

Caused by: Unable to load configuration. - bean - jar:file:/E:/Programming/apache-tomcat-6.0.26/webapps/Struts2/WEB-INF/lib/struts2-core-2.2.1.jar!/struts-default.xml:48:178

    ... 

Caused by: Unable to load bean: type:org.apache.struts2.dispatcher.multipart.MultiPartRequest class:org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest - bean - jar:file:/E:/Programming/apache-tomcat-6.0.26/webapps/Struts2/WEB-INF/lib/struts2-core-2.2.1.jar!/struts-default.xml:48:178

    ... 

Caused by: java.lang.NoClassDefFoundError: org/apache/commons/fileupload/RequestContext

    ...

Caused by: java.lang.ClassNotFoundException: org.apache.commons.fileupload.RequestContext

    ...

2010-9-24 11:16:02 org.apache.catalina.core.StandardContext start

严重: Error filterStart

2010-9-24 11:16:02 org.apache.catalina.core.StandardContext start

严重: Context [/Struts2] startup failed due to previous errors

这些错误很让我摸不着头脑，经多方查阅资料后，在Struts 2.2.x中应该导入如下7个JAR文件

1)   commons-fileupload-1.2.1.jar

2)   commons-io-1.3.2.jar

3)   freemarker-2.3.16.jar

4)   javassist-3.7.ga.jar

5)   ognl-3.0.jar

6)   struts2-core-2.2.1.jar

7)   xwork-core-2.2.1.jar

其实，这里还有一个小窍门，我们可以将Struts 2.2.x根目录下的apps文件夹下的struts2-blank-2.2.1.war文件进行解压，然后找到WEB-INF下的lib目录，我们可以发现里面列出了7个JAR文件，刚好这7个就是我们配置Struts 2.2.x需要导入的JARs文件

com.opensymphony.xwork2.util.logging.jdk.JdkLogger info 错误