java问题

Question

java.lang.NoClassDefFoundError: Could not initialize class com.dt.esignage.webserver.utils.FileThumbExtract
at com.dt.esignage.webserver.utils.FileUtils.createMediaThumbFile(FileUtils.java:535)
at com.dt.esignage.webserver.library.media.CreateMediaAction.saveFileToDisk(CreateMediaAction.java:294)
at com.dt.esignage.webserver.library.media.CreateMediaAction.defaultExecute(CreateMediaAction.java:92)
at com.dt.esignage.webserver.utils.BaseAppAction.execute(BaseAppAction.java:82)
at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.dt.esignage.webserver.secret.OperationFilter.doFilter(OperationFilter.java:84)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.dt.esignage.webserver.secret.LoginControlFilter.doFilter(LoginControlFilter.java:87)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.dt.esignage.webserver.upgrade.UpgradeFilter.doFilter(UpgradeFilter.java:37)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.dt.esignage.webserver.utils.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:136)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
请问各位高手，帮我看看这个问题是怎么回事！谢谢了···

Answer 1

碰见过java.lang.NoClassDefFoundError
好像是某个包没有引进来/或者就是类没有编译好，服务器找不着制定的类文件

Answer 2

没找到制定的jar包，看是哪个类没找到，加载到classpath就好了。

Answer 3

在这个路径下com.dt.esignage.webserver.utils没有找到你要的类FileThumbExtract 

Answer 4

在 com.dt.esignage.webserver.utils.FileUtils.createMediaThumbFile 类里，这个文件
(FileUtils.java:535) 里调了 com.dt.esignage.webserver.utils.FileThumbExtract 类。但没有这个类。

Answer 5

好像是你的服务器和JVM不兼容