velocity struts tomcat 发生java.lang.OutOfMemoryError错误,高手进来帮忙

我的项目采用如下技术
velocity struts tomcat 
在两个网面之间来回的跳转会发生错误
如下谁知道为什么吗,怎么解决这个问题
javax.servlet.ServletException: サーブレットの実行により例外を投げました
at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:222)
at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at 
com.nec.cb3.ccs2.common.filter.EncodingFilter.doFilter(EncodingFilter.java:90)
at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at 
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at 
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)root causejava.lang.OutOfMemoryError