Perl is not considered as an enterprise language
Reason: no big company support
Look at and imitate enterprise languages
Especially, Java
More precisely, Java stack traces
Untreated exceptions generate complete stack traces which allow a precise diagnostic of the problem
Stack trace of an exception from BEA WebLogic
java.lang.ThreadDeath
at java.lang.Thread.stop(Thread.java:578)
at weblogic.t3.srvr.T3Srvr.die(T3Srvr.java:2129)
at weblogic.t3.srvr.T3Srvr.waitForDeath(T3Srvr.java:1983)
at java.lang.reflect.Method.invoke(Native Method)
at weblogic.Server.startServerDynamically(Server.java:148)
at weblogic.Server.main(Server.java:97)
at weblogic.Server.main(Server.java:58)
Trace d'une exception au sein du logiciel iFS Config d'Oracle
java.lang.ClassCastException
at javax.swing.plaf.basic.BasicTextUI.getInputMap(BasicTextUI.java:379)
at javax.swing.plaf.basic.BasicTextUI.installKeyboardActions(BasicTextUI.java:360)
at javax.swing.plaf.basic.BasicTextUI.installUI(BasicTextUI.java:697)
at oracle.bali.ewt.olaf.OracleTextAreaUI.installUI(Unknown Source)
at javax.swing.JComponent.setUI(JComponent.java:449)
at javax.swing.text.JTextComponent.setUI(JTextComponent.java:287)
at javax.swing.text.JTextComponent.updateUI(JTextComponent.java:297)
at javax.swing.text.JTextComponent.<init>(JTextComponent.java:271)
at javax.swing.JTextArea.<init>(JTextArea.java:186)
at javax.swing.JTextArea.<init>(JTextArea.java:122)
at oracle.ifs.installer.IfsConfigWizardPage.<init>(IfsConfigWizardPage.java:145)
at oracle.ifs.installer.ActionQueueVerificationPage.<init>(IfsWizardFactory.java:595)
at oracle.ifs.installer.ProtocolServerOptionsPage.<init>(IfsWizardFactory.java:2989)
at oracle.ifs.installer.IfsWizardFactory.createWizard(IfsWizardFactory.java:376)
at oracle.ifs.installer.IfsConfig2.<init>(IfsConfig2.java:324)
at oracle.ifs.installer.IfsConfig2.main(IfsConfig2.java:203)
Detailed traces precisely indicate the critical path of the exception
Free softwares don't lag behind commercial softwares and show the road to follow
Stack trace of an exception from Jakarta Tomcat
org.xml.sax.SAXParseException: The content of element type "servlet" must match "(icon?,servlet-name,display-name?,description?,(servlet-class|jsp-file),init-param*,load-on-startup?,run-as?,security-role-ref*)".
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.handleEndElement(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.endElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1543)
at org.apache.catalina.startup.ContextConfig.applicationConfig(ContextConfig.java:282)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:639)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:243)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3567)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:738)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:347)
at org.apache.catalina.core.StandardService.start(StandardService.java:497)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2190)
at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at java.lang.reflect.Method.invoke(Native Method)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
(31 lines)
Stack trace of an exception from Sun JDK print manager from inside Jakarta Tomcat
2004-08-06 10:33:53 StandardWrapperValve[print]: "Servlet.service()" pour la servlet print a généré une exception javax.servlet.ServletException: Erreur durant l'impression at com.PROVIDER.prj.CLIENT.servlet.Print.service(Print.java:46) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:284) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAsPrivileged(Subject.java:499) at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:306) at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:200) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:278) at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:97) at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:187) at java.security.AccessController.doPrivileged(Native Method) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:183) at com.PROVIDER.servlet.FileUploadFilter.doFilter(FileUploadFilter.java:94) at sun.reflect.GeneratedMethodAccessor41.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:284) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAsPrivileged(Subject.java:499) at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:306) at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:256) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:97) at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:187) at java.security.AccessController.doPrivileged(Native Method) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:183) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:195) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206) at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:324) at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:395) at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:673) at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:615) at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:786) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683) at java.lang.Thread.run(Thread.java:536) Caused by: javax.servlet.ServletException: Error while extracting at com.PROVIDER.prj.CLIENT.servlet.FichePrint.doGet(FichePrint.java:338) at com.PROVIDER.prj.CLIENT.servlet.FichePrint.doPost(FichePrint.java:38) at javax.servlet.http.HttpServlet.service(HttpServlet.java:763) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.PROVIDER.prj.CLIENT.servlet.Print.service(Print.java:43) ... 53 more Caused by: com.PROVIDER.bean.ObjectNotFoundException: Objet non trouve : at com.PROVIDER.prj.CLIENT.XBean$PrivilegedLoadAction.run(XBean.java:1289) at java.security.AccessController.doPrivileged(Native Method) at com.PROVIDER.prj.CLIENT.XBean.load(XBean.java:1249) at com.PROVIDER.prj.CLIENT.XBean.load(XBean.java:1238) at com.PROVIDER.prj.CLIENT.servlet.FichePrint.doGet(FichePrint.java:319) ... 57 more
java.io.FileNotFoundException: /home/prttest/tomcat/logs/portal.log (Permission denied) at java.io.FileOutputStream.openAppend(Native Method) at java.io.FileOutputStream.<init>(FileOutputStream.java:177) at java.io.FileOutputStream.<init>(FileOutputStream.java:102) at org.apache.log4j.FileAppender.setFile(FileAppender.java:272) at org.apache.log4j.RollingFileAppender.setFile(RollingFileAppender.java:156) at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:151) at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:247) at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:123) at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:87) at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:645) at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:603) at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:500) at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:406) at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:432) at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:460) at org.apache.log4j.LogManager.<clinit>(LogManager.java:113) at org.apache.log4j.Logger.getLogger(Logger.java:85) at org.apache.commons.logging.impl.Log4JLogger.<init>(Log4JLogger.java:102) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:274) at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209) at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351) at org.apache.commons.beanutils.ConvertUtilsBean.<init>(ConvertUtilsBean.java:130) at org.apache.commons.beanutils.BeanUtilsBean.<init>(BeanUtilsBean.java:110) at org.apache.commons.beanutils.BeanUtilsBean$1.initialValue(BeanUtilsBean.java:68) at org.apache.commons.beanutils.ContextClassLoaderLocal.get(ContextClassLoaderLocal.java:80) at org.apache.commons.beanutils.BeanUtilsBean.getInstance(BeanUtilsBean.java:78) at org.apache.commons.beanutils.ConvertUtilsBean.getInstance(ConvertUtilsBean.java:115) at org.apache.commons.beanutils.ConvertUtils.convert(ConvertUtils.java:217) at org.apache.commons.digester.CallMethodRule.end(CallMethodRule.java:457) at org.apache.commons.digester.Rule.end(Rule.java:276) at org.apache.commons.digester.Digester.endElement(Digester.java:1058) at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.commons.digester.Digester.parse(Digester.java:1548) at org.apache.catalina.startup.ContextConfig.defaultConfig(ContextConfig.java:515) at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:623) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:216) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4290) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595) at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:277) at org.apache.catalina.core.StandardHost.install(StandardHost.java:832) at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:701) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:432) at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1083) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:327) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.StandardHost.backgroundProcess(StandardHost.java:800) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1619) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1628) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1608) at java.lang.Thread.run(Thread.java:534)
(66 lines)
Acme::JavaTrace module, available on the CPAN
Overloads the functions warn() and die()
Acme::JavaTrace augments the paradigm of these widely used functions while keeping their semantic untouched
Use is extremely simplified: use Acme::JavaTrace
Stack trace of warnings generated by a test script of HTTP::Proxy
getsockname() on closed socket Symbol::GEN1
at IO::Socket::sockname(/System/Library/Perl/darwin/IO/Socket.pm:186)
at IO::Socket::INET::sockport(/System/Library/Perl/IO/Socket/INET.pm:231)
at HTTP::Daemon::url(/Library/Perl/HTTP/Daemon.pm:52)
at HTTP::Daemon::ClientConn::get_request(/Library/Perl/HTTP/Daemon.pm:139)
at HTTP::Proxy::serve_connections(lib/HTTP/Proxy.pm:287)
at HTTP::Proxy::start(lib/HTTP/Proxy.pm:179)
at t::Utils::fork_proxy(t/Utils.pm:72)
at main::(t/20keepalive.t:70)
Use of uninitialized value in numeric ne (!=)
at HTTP::Daemon::url(/Library/Perl/HTTP/Daemon.pm:53)
at HTTP::Daemon::ClientConn::get_request(/Library/Perl/HTTP/Daemon.pm:139)
at HTTP::Proxy::serve_connections(lib/HTTP/Proxy.pm:287)
at HTTP::Proxy::start(lib/HTTP/Proxy.pm:179)
at t::Utils::fork_proxy(t/Utils.pm:72)
at main::(t/20keepalive.t:70)
Use of uninitialized value in concatenation (.)
at HTTP::Daemon::url(/Library/Perl/HTTP/Daemon.pm:53)
at HTTP::Daemon::ClientConn::get_request(/Library/Perl/HTTP/Daemon.pm:139)
at HTTP::Proxy::serve_connections(lib/HTTP/Proxy.pm:287)
at HTTP::Proxy::start(lib/HTTP/Proxy.pm:179)
at t::Utils::fork_proxy(t/Utils.pm:72)
at main::(t/20keepalive.t:70)
Stack trace of warnings generated by a test script of NetworkInfo::Discovery::Rendezvous
Use of uninitialized value in split
at Net::Rendezvous::Entry::fetch(/Library/Perl/Net/Rendezvous/Entry.pm:172)
at Net::Rendezvous::discover(/Library/Perl/Net/Rendezvous.pm:320)
at NetworkInfo::Discovery::Rendezvous::discover_service(lib/NetworkInfo/Discovery/Rendezvous.pm:140)
at NetworkInfo::Discovery::Rendezvous::do_it(lib/NetworkInfo/Discovery/Rendezvous.pm:117)
at <eval>(t/20rendezvous.t:48)
at main::(t/20rendezvous.t:48)
Use of uninitialized value in sprintf
at Net::Rendezvous::Entry::type(/Library/Perl/Net/Rendezvous/Entry.pm:247)
at Net::Rendezvous::Entry::fetch(/Library/Perl/Net/Rendezvous/Entry.pm:175)
at Net::Rendezvous::discover(/Library/Perl/Net/Rendezvous.pm:320)
at NetworkInfo::Discovery::Rendezvous::discover_service(lib/NetworkInfo/Discovery/Rendezvous.pm:140)
at NetworkInfo::Discovery::Rendezvous::do_it(lib/NetworkInfo/Discovery/Rendezvous.pm:117)
at <eval>(t/20rendezvous.t:48)
at main::(t/20rendezvous.t:48)
Use of uninitialized value in sprintf
at Net::Rendezvous::Entry::type(/Library/Perl/Net/Rendezvous/Entry.pm:247)
at Net::Rendezvous::Entry::fetch(/Library/Perl/Net/Rendezvous/Entry.pm:175)
at Net::Rendezvous::discover(/Library/Perl/Net/Rendezvous.pm:320)
at NetworkInfo::Discovery::Rendezvous::discover_service(lib/NetworkInfo/Discovery/Rendezvous.pm:140)
at NetworkInfo::Discovery::Rendezvous::do_it(lib/NetworkInfo/Discovery/Rendezvous.pm:117)
at <eval>(t/20rendezvous.t:48)
at main::(t/20rendezvous.t:48)
Name is not compatible with industrial Best Practices
Creation of an enterprise version, named Devel::SimpleTrace
Also available on the CPAN
Thanks to Sun and Tomcat for offering such guarantees of unlimited work to the systems administrators