gwt exception, more than 1000 every day.

My environment is apache( mod jk) + tomcat instance (total three ) in
different machine, following exception is from tomcat localhost log
file.

Mty questions is: who leads the exception ? mod jk ? busy network ?
thanks
exception is following:

Mar 1, 2012 12:00:19 AM org.apache.catalina.core.ApplicationContext
log
SEVERE: Exception while dispatching incoming RPC call
java.io.IOException
at
org.apache.jk.common.JkInputStream.receive(JkInputStream.java:205)
at
org.apache.jk.common.JkInputStream.refillReadBuffer(JkInputStream.java:
265)
at
org.apache.jk.common.JkInputStream.doRead(JkInputStream.java:183)
at org.apache.coyote.Request.doRead(Request.java:427)
at
org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:
304)
at
org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:419)
at
org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:327)
at
org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:
162)
at
com.google.gwt.user.server.rpc.RPCServletUtils.readContent(RPCServletUtils.java:
175)
at
com.google.gwt.user.server.rpc.RPCServletUtils.readContentAsGwtRpc(RPCServletUtils.java:
205)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.readContent(AbstractRemoteServiceServlet.java:
182)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
239)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:
637)
at
com.mgt3.w.common.server.AutoinjectingRemoteServiceServlet.service(AutoinjectingRemoteServiceServlet.java:
32)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:
717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:
290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:
206)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:343)
at
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:
109)
at
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:
83)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:
97)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:
100)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
com.mgt3.security.RequiresLogoutFilter.doFilter(RequiresLogoutFilter.java:
49)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:
78)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:
54)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:
35)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:
177)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter.doFilter(DefaultLoginPageGeneratingFilter.java:
90)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:
188)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:
188)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:
105)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:
79)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:
149)
at
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:
237)
at
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:
167)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:
235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:
206)
at
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:
110)
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:
191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:
127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
102)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:
615)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:
109)
at
org.apache.catalina.ha.session.JvmRouteBinderValve.invoke(JvmRouteBinderValve.java:
233)
at
org.apache.catalina.ha.tcp.ReplicationValve.invoke(ReplicationValve.java:
352)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
293)
at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:195)
at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:296)
at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:815)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:
716)
at org.apache.jk.common.ChannelSocket
$SocketConnection.runIt(ChannelSocket.java:947)
at org.apache.tomcat.util.threads.ThreadPool
$ControlRunnable.run(ThreadPool.java:701)
at java.lang.Thread.run(Thread.java:619)

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