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