JBoss AS CPU loop - incorrect synchronization on HashMap? --------------------------------------------------------- Key: JBAS-8369 URL: https://jira.jboss.org/browse/JBAS-8369 Project: JBoss Application Server Issue Type: Bug Security Level: Public (Everyone can see) Components: Web (Tomcat) service Affects Versions: JBossAS-5.1.0.GA Environment: SUSE Linux 2.6.27.19-5-default #1 SMP 2009-02-28 04:40:21 +0100 x86_64 x86_64 x86_64 GNU/Linux Reporter: Stephen Potter Assignee: Remy Maucherat Web application becomes unresponsive. JBoss java CPU at 340%. jstack shows 3 JBoss web threads in HashMap.get suggesting that the cause is incorrectly synchronized use of a HashMap. Extract of stack dump: "ajp-127.0.0.1-50113-55" daemon prio=10 tid=0x000000004c364800 nid=0x4f1 runnable [0x00007f6f09cd7000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.get(HashMap.java:303) at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:71) at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:92) at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:92) at org.jboss.web.tomcat.service.injection.TomcatInjectionUtils.processDynamicBeanAnnotations(TomcatInjectionUtils.java:59) at org.jboss.web.tomcat.service.TomcatInjectionContainer.processAnnotations(TomcatInjectionContainer.java:407) at org.jboss.web.tomcat.service.TomcatInjectionContainer.processDynamicBeanAnnotations(TomcatInjectionContainer.java:382) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:274) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:265) at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:145) - locked <0x00007f6f8d353200> (a org.apache.jasper.servlet.JspServletWrapper) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) . . . . . . . . . . . . . "ajp-127.0.0.1-50113-15" daemon prio=10 tid=0x000000005caa6800 nid=0x15f2 runnable [0x00007f6f4073d000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.get(HashMap.java:303) at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:71) at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:92) at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:92) at org.jboss.web.tomcat.service.injection.TomcatInjectionUtils.processDynamicBeanAnnotations(TomcatInjectionUtils.java:59) at org.jboss.web.tomcat.service.TomcatInjectionContainer.processAnnotations(TomcatInjectionContainer.java:407) at org.jboss.web.tomcat.service.TomcatInjectionContainer.processDynamicBeanAnnotations(TomcatInjectionContainer.java:382) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:274) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:265) at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:145) - locked <0x00007f6fd8a886b0> (a org.apache.jasper.servlet.JspServletWrapper) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) . . . . . . . . . . . . . "ajp-127.0.0.1-50113-6" daemon prio=10 tid=0x00000000418f0000 nid=0x25d7 runnable [0x00007f6f41045000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.get(HashMap.java:303) at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:71) at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:92) at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:92) at org.jboss.web.tomcat.service.injection.TomcatInjectionUtils.processDynamicBeanAnnotations(TomcatInjectionUtils.java:59) at org.jboss.web.tomcat.service.TomcatInjectionContainer.processAnnotations(TomcatInjectionContainer.java:407) at org.jboss.web.tomcat.service.TomcatInjectionContainer.processDynamicBeanAnnotations(TomcatInjectionContainer.java:382) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:274) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:265) at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:145) - locked <0x00007f6fd40a01b8> (a org.apache.jasper.servlet.JspServletWrapper) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) . . . . . . . . . . . . . -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira