I can see repeating NumberFormatExceptions in localhost.2008-06-XX.log files.
Here are examples:
Jun 6, 2008 3:02:18 PM org.apache.catalina.core.ApplicationContext log
SEVERE: Error while serving http://XXX/hudson/job/XXX/buildHistory/ajax
java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor267.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.kohsuke.stapler.Function$InstanceFunction.invoke
(Function.java:103)
at org.kohsuke.stapler.Function.bindAndinvoke(Function.java:57)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:75)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch
(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:432)
at org.kohsuke.stapler.MetaClass$15.dispatch(MetaClass.java:375)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:432)
at org.kohsuke.stapler.MetaClass$9.doDispatch(MetaClass.java:254)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch
(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:432)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:360)
at org.kohsuke.stapler.Stapler.service(Stapler.java:120)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:88)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke
(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke
(StandardContextValve.java:175)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke
(AuthenticatorBase.java:433)
at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:844)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process
(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run
(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:415)
at java.lang.Integer.parseInt(Integer.java:497)
at hudson.model.Job$2.compare(Job.java:329)
at hudson.model.Job$2.compare(Job.java:327)
at hudson.widgets.HistoryWidget.doAjax(HistoryWidget.java:118)
... 32 more
Jun 6, 2008 3:02:18 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Stapler threw exception
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:415)
at java.lang.Integer.parseInt(Integer.java:497)
at hudson.model.Job$2.compare(Job.java:329)
at hudson.model.Job$2.compare(Job.java:327)
at hudson.widgets.HistoryWidget.doAjax(HistoryWidget.java:118)
at sun.reflect.GeneratedMethodAccessor267.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.kohsuke.stapler.Function$InstanceFunction.invoke
(Function.java:103)
at org.kohsuke.stapler.Function.bindAndinvoke(Function.java:57)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:75)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch
(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:432)
at org.kohsuke.stapler.MetaClass$15.dispatch(MetaClass.java:375)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:432)
at org.kohsuke.stapler.MetaClass$9.doDispatch(MetaClass.java:254)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch
(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:432)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:360)
at org.kohsuke.stapler.Stapler.service(Stapler.java:120)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:88)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke
(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke
(StandardContextValve.java:175)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke
(AuthenticatorBase.java:433)
at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:844)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process
(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run
(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:595)