[ http://jira.qos.ch/browse/LBCORE-96?page=com.atlassian.jira.plugin.system.is... ] Ceki Gulcu resolved LBCORE-96. ------------------------------ Resolution: Won't Fix Without a test case, I can't reproduce the problem.
Deadlock when running on multiple core processors -------------------------------------------------
Key: LBCORE-96 URL: http://jira.qos.ch/browse/LBCORE-96 Project: logback-core Issue Type: Bug Components: Appender Affects Versions: 0.9.15 Environment: Windows Vista quad core Apache Tomcat 6.0.18 JDK 1.6 Reporter: Lars Feistner Assignee: Logback dev list Attachments: AppenderBaseLock.patch
As Robert Dale mentioned on 23/Mar/09 04:05 PM I'm getting that deadlock in logback core (0.9.14 and 0.9.15). No console plugin or socket appenders, just plain RollingFileAppender. I am getting the deadlock using ConsoleAppender. see attached thread dump: 2009-04-06 11:49:45 Full thread dump Java HotSpot(TM) Client VM (11.0-b12 mixed mode, sharing): "http-8084-5" daemon prio=6 tid=0x04700c00 nid=0xc54 in Object.wait() [0x05d1f000..0x05d1fc68] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x24338c70> (a org.apache.tomcat.util.net.JIoEndpoint$Worker) at java.lang.Object.wait(Object.java:485) at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:416) - locked <0x24338c70> (a org.apache.tomcat.util.net.JIoEndpoint$Worker) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:442) at java.lang.Thread.run(Thread.java:619) "http-8084-4" daemon prio=6 tid=0x04700000 nid=0xe24 in Object.wait() [0x05c7f000..0x05c7fbe8] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x24254da8> (a org.apache.tomcat.util.net.JIoEndpoint$Worker) at java.lang.Object.wait(Object.java:485) at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:416) - locked <0x24254da8> (a org.apache.tomcat.util.net.JIoEndpoint$Worker) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:442) at java.lang.Thread.run(Thread.java:619) "http-8084-3" daemon prio=6 tid=0x04700400 nid=0x134c waiting for monitor entry [0x05c2f000..0x05c2fa68] java.lang.Thread.State: BLOCKED (on object monitor) at ch.qos.logback.core.AppenderBase.doAppend(AppenderBase.java:66) - waiting to lock <0x23b16ac8> (a ch.qos.logback.core.ConsoleAppender) at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:60) at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270) at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257) at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:439) at ch.qos.logback.classic.Logger.filterAndLog_1(Logger.java:411) at ch.qos.logback.classic.Logger.debug(Logger.java:504) at de.ims.server.jguard.ImsRemoteServiceServlet.processCall(ImsRemoteServiceServlet.java:88) at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390) 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:191) 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:845) 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:619) "Thread-10" daemon prio=6 tid=0x046ff800 nid=0x122c runnable [0x05bdf000..0x05bdfb68] java.lang.Thread.State: RUNNABLE at sun.net.dns.ResolverConfigurationImpl.notifyAddrChange0(Native Method) at sun.net.dns.ResolverConfigurationImpl$AddressChangeListener.run(ResolverConfigurationImpl.java:125) "http-8084-2" daemon prio=6 tid=0x046ff400 nid=0x17f4 waiting for monitor entry [0x05b8f000..0x05b8fa68] java.lang.Thread.State: BLOCKED (on object monitor) at ch.qos.logback.core.AppenderBase.doAppend(AppenderBase.java:66) - waiting to lock <0x23b16ac8> (a ch.qos.logback.core.ConsoleAppender) at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:60) at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270) at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257) at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:439) at ch.qos.logback.classic.Logger.filterAndLog_1(Logger.java:411) at ch.qos.logback.classic.Logger.debug(Logger.java:504) at de.ims.server.jguard.ImsRemoteServiceServlet.processCall(ImsRemoteServiceServlet.java:88) at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390) 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:191) 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:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) "TP-Monitor" daemon prio=6 tid=0x04a17400 nid=0x830 in Object.wait() [0x05b3f000..0x05b3fce8] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x23e0a900> (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable) at org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run(ThreadPool.java:565) - locked <0x23e0a900> (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable) at java.lang.Thread.run(Thread.java:619) "TP-Processor4" daemon prio=6 tid=0x0497a000 nid=0x11dc runnable [0x05a8f000..0x05a8fd68] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384) - locked <0x23e0a9b0> (a java.net.SocksSocketImpl) at java.net.ServerSocket.implAccept(ServerSocket.java:453) at java.net.ServerSocket.accept(ServerSocket.java:421) at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:306) at org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:660) at org.apache.jk.common.ChannelSocket$SocketAcceptor.runIt(ChannelSocket.java:870) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690) at java.lang.Thread.run(Thread.java:619) "TP-Processor3" daemon prio=6 tid=0x04979c00 nid=0xfe8 in Object.wait() [0x05a3f000..0x05a3f9e8] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x23e0abc8> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Object.wait(Object.java:485) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:662) - locked <0x23e0abc8> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Thread.run(Thread.java:619) "TP-Processor2" daemon prio=6 tid=0x04982800 nid=0x10bc in Object.wait() [0x059ef000..0x059efa68] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x23e0ac68> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Object.wait(Object.java:485) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:662) - locked <0x23e0ac68> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Thread.run(Thread.java:619) "TP-Processor1" daemon prio=6 tid=0x04982000 nid=0x131c in Object.wait() [0x0599f000..0x0599fae8] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x23e0ad08> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Object.wait(Object.java:485) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:662) - locked <0x23e0ad08> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Thread.run(Thread.java:619) "http-8084-1" daemon prio=6 tid=0x04917000 nid=0x15f4 runnable [0x0594f000..0x0594fb68] java.lang.Thread.State: RUNNABLE at java.io.FileOutputStream.writeBytes(Native Method) at java.io.FileOutputStream.write(FileOutputStream.java:260) at java.io.BufferedOutputStream.write(BufferedOutputStream.java:105) - locked <0x2395d280> (a java.io.BufferedOutputStream) at java.io.PrintStream.write(PrintStream.java:430) - locked <0x23951d08> (a java.io.PrintStream) at org.apache.tomcat.util.log.SystemLogHandler.write(SystemLogHandler.java:166) at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:202) at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:272) at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:276) at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:122) - locked <0x23b1c1f0> (a java.io.OutputStreamWriter) at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:212) at ch.qos.logback.core.WriterAppender.writerWrite(WriterAppender.java:245) at ch.qos.logback.core.WriterAppender.subAppend(WriterAppender.java:261) at ch.qos.logback.core.WriterAppender.append(WriterAppender.java:114) at ch.qos.logback.core.AppenderBase.doAppend(AppenderBase.java:87) - locked <0x23b16ac8> (a ch.qos.logback.core.ConsoleAppender) at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:60) at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270) at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257) at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:439) at ch.qos.logback.classic.Logger.filterAndLog_1(Logger.java:411) at ch.qos.logback.classic.Logger.debug(Logger.java:504) at de.ims.server.jguard.ImsRemoteServiceServlet.processCall(ImsRemoteServiceServlet.java:92) at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390) 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:191) 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:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) "http-8084-Acceptor-0" daemon prio=6 tid=0x049c2400 nid=0x129c runnable [0x058bf000..0x058bfbe8] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384) - locked <0x23a40168> (a java.net.SocksSocketImpl) at java.net.ServerSocket.implAccept(ServerSocket.java:453) at java.net.ServerSocket.accept(ServerSocket.java:421) at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:61) at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:310) at java.lang.Thread.run(Thread.java:619) "ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon prio=6 tid=0x051c9800 nid=0x152c waiting on condition [0x0452f000..0x0452fc68] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1579) at java.lang.Thread.run(Thread.java:619) "Thread-1" daemon prio=2 tid=0x04638c00 nid=0x1360 in Object.wait() [0x044df000..0x044dfce8] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x23b87d30> (a EDU.oswego.cs.dl.util.concurrent.ClockDaemon) at EDU.oswego.cs.dl.util.concurrent.ClockDaemon.nextTask(ClockDaemon.java:328) - locked <0x23b87d30> (a EDU.oswego.cs.dl.util.concurrent.ClockDaemon) at EDU.oswego.cs.dl.util.concurrent.ClockDaemon$RunLoop.run(ClockDaemon.java:362) at java.lang.Thread.run(Thread.java:619) "ElementEventQueue.QProcessor-1" daemon prio=6 tid=0x050f2800 nid=0x17d0 in Object.wait() [0x0442f000..0x0442fd68] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x23b81398> (a java.lang.Object) at java.lang.Object.wait(Object.java:485) at org.apache.jcs.engine.control.event.ElementEventQueue.take(ElementEventQueue.java:181) - locked <0x23b81398> (a java.lang.Object) at org.apache.jcs.engine.control.event.ElementEventQueue.access$300(ElementEventQueue.java:35) at org.apache.jcs.engine.control.event.ElementEventQueue$QProcessor.run(ElementEventQueue.java:245) "Low Memory Detector" daemon prio=6 tid=0x0215c800 nid=0x1370 runnable [0x00000000..0x00000000] java.lang.Thread.State: RUNNABLE "CompilerThread0" daemon prio=10 tid=0x02156400 nid=0x758 waiting on condition [0x00000000..0x0433f890] java.lang.Thread.State: RUNNABLE "Attach Listener" daemon prio=10 tid=0x02155400 nid=0x14f4 waiting on condition [0x00000000..0x00000000] java.lang.Thread.State: RUNNABLE "Signal Dispatcher" daemon prio=10 tid=0x0214ac00 nid=0x151c runnable [0x00000000..0x00000000] java.lang.Thread.State: RUNNABLE "Finalizer" daemon prio=8 tid=0x02143000 nid=0x430 in Object.wait() [0x0424f000..0x0424fce8] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x2394e760> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116) - locked <0x2394e760> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159) "Reference Handler" daemon prio=10 tid=0x02141000 nid=0x510 in Object.wait() [0x0091f000..0x0091fc68] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x2394e7e8> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:485) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116) - locked <0x2394e7e8> (a java.lang.ref.Reference$Lock) "main" prio=6 tid=0x0020a800 nid=0xef4 runnable [0x0025f000..0x0025fe28] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384) - locked <0x23e18dc0> (a java.net.SocksSocketImpl) at java.net.ServerSocket.implAccept(ServerSocket.java:453) at java.net.ServerSocket.accept(ServerSocket.java:421) at org.apache.catalina.core.StandardServer.await(StandardServer.java:389) at org.apache.catalina.startup.Catalina.await(Catalina.java:642) at org.apache.catalina.startup.Catalina.start(Catalina.java:602) 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:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) "VM Thread" prio=10 tid=0x0213fc00 nid=0xdc0 runnable "VM Periodic Task Thread" prio=10 tid=0x0215dc00 nid=0x1128 waiting on condition JNI global references: 781 i also attach my logback configuration: <?xml version="1.0" encoding="UTF-8"?> <configuration debug="true"> <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender"> <layout class="ch.qos.logback.classic.PatternLayout"> <Pattern> Operator %X{client}: %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} %L - %msg%n </Pattern> </layout> </appender> <!-- <appender name="file" class="ch.qos.logback.core.FileAppender" > <File>imsm-debug.log</File> <Append>false</Append> <layout class="ch.qos.logback.classic.PatternLayout"> <Pattern> %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} %L - %msg%n </Pattern> </layout> </appender> --> <logger name="net.sf.jguard.core" additivity="false"> <level value="INFO" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="net.sf.jguard.core.authorization" additivity="false"> <level value="debug"/> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="net.sf.jguard.core.filters" additivity="false"> <level value="debug"/> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="net.sf.jguard.ext" additivity="false"> <level value="INFO" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="net.sf.jguard.jee" additivity="false"> <level value="INFO" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="net.sf.ehcache" additivity="false"> <level value="INFO" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="de.ims.core.db" additivity="false"> <level value="DEBUG" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="de.ims.core.db.util" additivity="false"> <level value="INFO" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="de.ims.core.db.jguard" additivity="false"> <level value="INFO" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="de.ims.core.db.DBUserImpl" additivity="false"> <level value="DEBUG" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="de.ims.core.db.DBGroupImpl" additivity="false"> <level value="DEBUG" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="de.ims.core.db.DBOperatorImpl" additivity="false"> <level value="INFO" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="de.ims.core.db.DBInstitutionImpl" additivity="false"> <level value="INFO" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <logger name="org.apache.jcs" additivity="false"> <level value="WARN" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </logger> <root> <!-- The following level element is not necessary since the --> <!-- level of the root level is set to DEBUG by default. --> <level value="DEBUG" /> <appender-ref ref="stdout" /> <!--<appender-ref ref="file" />--> </root> </configuration>
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