If you don't use the javatemplate plugin all Struts2 UI Tags are using freemarker templates internal.
So maybe you can solve your problem with latest Struts2 Version. Johannes Abhi-2 wrote: > > Hi > > I have a production web application running in Tomcat. The web application > uses struts 2 as MVC layer. > > We had an issue wherein one of the web servers spiked to 100% cpu usage. > This issue lasted for over several hours. I took the thread dump and saw > over several hundred threads in runnable state and the dumps show the > following stack trace for most of the threads. > > "TP-Processor480" daemon prio=10 tid=0x00002aab8c1ff400 nid=0xf23 runnable > [0x00000000656af000..0x00000000656b3d90] > > java.lang.Thread.State: RUNNABLE > > at java.util.HashMap.get(HashMap.java:303) > > at > com.opensymphony.xwork2.util.LocalizedTextUtil.buildMessageFormat(LocalizedTextUtil.java:620) > > at > com.opensymphony.xwork2.util.LocalizedTextUtil.getDefaultMessage(LocalizedTextUtil.java:588) > > at > com.opensymphony.xwork2.util.LocalizedTextUtil.findText(LocalizedTextUtil.java:461) > > at > com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:224) > > at > com.opensymphony.xwork2.ActionSupport.getText(ActionSupport.java:99) > > at org.apache.struts2.components.Text.end(Text.java:158) > > at > org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:43) > > at > org.apache.jsp.tag.web.tabs_tag._jspx_meth_s_005ftext_005f2(tabs_tag.java:565) > > at > org.apache.jsp.tag.web.tabs_tag._jspx_meth_s_005fif_005f0(tabs_tag.java:280) > > at org.apache.jsp.tag.web.tabs_tag.doTag(tabs_tag.java:113) > > at org.apache.jsp.myjsp_jsp._jspService(myjsp_jsp.java:379) > > at > org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98) > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) > > at > org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331) > > at > org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329) > > at > org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) > > at > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) > > at > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) > > at > org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679) > > at > org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461) > > at > org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:399) > > at > org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) > > at > org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:139) > > at > org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:178) > > at > com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:348) > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:253) > > at > com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:221) > > at > com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) > > at > com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224) > > at > com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223) > > at > com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455) > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221) > > at > com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:150) > > at > org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:48) > > at > com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) > > at > com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224) > > at > com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223) > > at > com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455) > > at > com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221) > > > Now the code in question uses struts s:text tag and just fetches the value > from a property file. I am not sure why so many threads should get stuck > over there (threads are in runnable state).java.util.HashMap is not > threadsafe, and if accessed concurrently by multiple threads, one > particular > mode of failure is an infinite loop within a particular > bucket<http://mailinator.blogspot.com/2009/06/beautiful-race-condition.html>, > which could be causing this issue. > > This issue happens only once after our deployment, and if we restart the > server it will never occur. > > https://issues.apache.org/jira/browse/ww-2808 mentions that using s:text > could have performance issues. They mentioned configuring freemarker cache > could improve the performance. > > We are using Struts 2.0.11 and don't use freemarker template. Will > updating > the Struts to latest version and switching to freemarker template could > help > us in resolving this issue? (as freemarker template can be configured to > use a internal ConcurrentHashMap). > > I never used freemarker template and we don't want to shift to this unless > we are sure that this could fix the issue. > > Did anyone experienced such issue before. > > > Thanks > > Abhilash > > -- View this message in context: http://old.nabble.com/High-CPU-usage-tp31095892p31096630.html Sent from the Struts - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@struts.apache.org For additional commands, e-mail: user-h...@struts.apache.org
