下面是报错信息，该导入飞jar包也都导入了，这个类也存在，为什么提示就是找不到呢？
三月 05, 2013 5:30:39 下午 org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.7.0_11\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jdk1.7.0_11/bin/../jre/bin/server;C:/Program Files/Java/jdk1.7.0_11/bin/../jre/bin;C:/Program Files/Java/jdk1.7.0_11/bin/../jre/lib/amd64;C:\Program Files (x86)\AMD APP\bin\x86_64;C:\Program Files (x86)\AMD APP\bin\x86;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files (x86)\MySQL\MySQL Server 5.5\bin;C:\Program Files\TortoiseSVN\bin;C:\Program Files\Java\jdk1.7.0_11\bin;C:\eclipse;;.
三月 05, 2013 5:30:41 下午 org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:jshop' did not find a matching property.
三月 05, 2013 5:30:42 下午 org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
三月 05, 2013 5:30:42 下午 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 7333 ms
三月 05, 2013 5:30:43 下午 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
三月 05, 2013 5:30:43 下午 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.30
三月 05, 2013 5:30:45 下午 org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.
三月 05, 2013 5:30:47 下午 org.apache.catalina.core.StandardContext filterStart
SEVERE: Exception starting filter struts2
java.lang.NoClassDefFoundError: com/jshop/entity/UserT
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
at java.lang.Class.privateGetPublicMethods(Class.java:2562)
at java.lang.Class.getMethods(Class.java:1427)
at org.apache.struts2.convention.PackageBasedActionConfigBuilder.getActionAnnotations(PackageBasedActionConfigBuilder.java:728)
at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildConfiguration(PackageBasedActionConfigBuilder.java:541)
at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:318)