Hi,
we used to deploy our webapp in a tomcat 6.0.35 and want to upgrade to tomcat 8.0.9. During testing we discovered, that the startup process of tomcat 8 is twice as long as the startup process of tomcat 6 (with the same single webapp deployed) My test system is as follows: Windows 7, JRE 1.7.0, Tomcat 6.0.35/8.0.9 Inspection of the log files revealed, that the additional time is used for class loading: Log of tomcat 6: ... Nov 28, 2014 5:07:59 PM org.apache.tomcat.util.digester.Digester endDocument Fein: endDocument() Nov 28, 2014 5:07:59 PM org.apache.catalina.loader.WebappClassLoader loadClass Fein: loadClass(org.springframework.web.util.Log4jConfigListener, false) ... Fein: Parent class loader is: WebappClassLoader context: delegate: false repositories: ----------> Parent Classloader: org.apache.catalina.loader.StandardClassLoader@189ff97 Nov 28, 2014 5:08:08 PM org.apache.jasper.compiler.JspRuntimeContext initClassPath Fein: Compilation classpath initialized: ... Nov 28, 2014 5:08:08 PM org.apache.jasper.servlet.JspServlet init Fein: Scratch dir for the JSP engine is: ... Nov 28, 2014 5:08:08 PM org.apache.jasper.servlet.JspServlet init Fein: IMPORTANT: Do not modify the generated servlets Nov 28, 2014 5:08:08 PM org.apache.catalina.core.StandardContext start Fein: Starting completed ... Nov 28, 2014 5:08:09 PM org.apache.catalina.startup.Catalina start Information: Server startup in 10861 ms Log of tomcat 8: ... 28-Nov-2014 16:09:09.128 FINER [localhost-startStop-1] org.apache.tomcat.util.scan.StandardJarScanner.scan Not scanning JAR [file:/C:/Program%20Files/tomcat%208/tolina_webserver-3.0.0-SNAPSHOT-20141103-130423/bin/tomcat-juli.jar] from classpath 28-Nov-2014 16:09:09.128 FINE [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoader.loadClass loadClass(org.apache.jasper.servlet.JasperInitializer, false) 28-Nov-2014 16:09:09.128 FINE [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoader.loadClass Delegating to parent classloader1 java.net.URLClassLoader@1c47dd5 28-Nov-2014 16:09:09.128 FINE [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoader.loadClass Loading class from parent ... 28-Nov-2014 16:09:28.362 FINE [localhost-startStop-1] org.apache.jasper.compiler.JspRuntimeContext.<init> Parent class loader is: WebappClassLoader context: /manager delegate: false ----------> Parent Classloader: java.net.URLClassLoader@1c47dd5 28-Nov-2014 16:09:28.362 FINE [localhost-startStop-1] org.apache.jasper.compiler.JspRuntimeContext.initClassPath Compilation classpath initialized: ... 28-Nov-2014 16:09:28.362 FINE [localhost-startStop-1] org.apache.jasper.servlet.JspServlet.init Scratch dir for the JSP engine is: ... 28-Nov-2014 16:09:28.362 FINE [localhost-startStop-1] org.apache.jasper.servlet.JspServlet.init IMPORTANT: Do not modify the generated servlets 28-Nov-2014 16:09:28.362 FINE [localhost-startStop-1] org.apache.tomcat.util.modeler.Registry.registerComponent Managed= Catalina:type=JspMonitor,WebModule=//localhost/manager,name=jsp,J2EEApplication=none,J2EEServer=none 28-Nov-2014 16:09:28.362 FINE [localhost-startStop-1] org.apache.tomcat.util.modeler.BaseModelMBean.preRegister preRegister org.apache.jasper.servlet.JspServlet@1067d4c Catalina:type=JspMonitor,WebModule=//localhost/manager,name=jsp,J2EEApplication=none,J2EEServer=none 28-Nov-2014 16:09:28.362 FINE [localhost-startStop-1] org.apache.catalina.core.StandardContext.startInternal Starting completed 28-Nov-2014 16:09:28.362 FINE [localhost-startStop-1] org.apache.catalina.util.LifecycleBase.setStateInternal Setting state for [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/manager]] to [STARTING] 28-Nov-2014 16:09:28.362 FINE [localhost-startStop-1] org.apache.catalina.util.LifecycleBase.setStateInternal Setting state for [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/manager]] to [STARTED] ... 28-Nov-2014 16:09:28.377 FINE [main] org.apache.catalina.util.LifecycleBase.setStateInternal Setting state for [StandardServer[8005]] to [STARTED] 28-Nov-2014 16:09:28.377 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 21443 ms Searching the web and the mail archives resulted in quite a few hints how to improve performance generally. I followed the instructions on wiki.apache.org/tomcat/HowTo/FasterStartUp, in particular: - Disabling JAR scanning (metadata-complete="true", <absolute-ordering/> in the <web-app>. - in catalina.properties: tomcat.util.scan.StandardJarScanFilter.jarsToSkip=\*.jar org.apache.catalina.startup.ContextConfig.jarsToSkip=\*.jar org.apache.catalina.startup.TldConfig.jarsToSkip=\*.jar - Removing the web socket API and implementation JARs - Changing the entropy source (-Djava.security.egd=file:/dev/./urandom) These changes were in effect when the above logs were written. While these changes resulted in a faster startup process (on both tomcats), I found no clue about why tomcat 8 takes longer in general to complete server startup. I compared the jars loaded in both cases and tried to remove the two additional jars in tomcat 8. I compared the configurations of both tomcats and aligned the registered listeners and disabled XMLValidation and XMLNameSpaceAware in server.xml. I reduced the bigger MIME-Mapping in web.xml of tomcat 8 to the MIME-Mapping of tomcat 6. I compared the number of classes and ressources loaded and the number of ClassNotFound- or RessourceNotFound-Messages in the log files. None of these actions resulted in new insights to the problem. Any advice on this subject or any hint to additional ressources that could help would be appreciated very much. Best regards, Gero --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
