>From the stack trace, as you mention, this is the error: Caused by: java.lang.IllegalAccessError: tried to access method org.apache.logging.log4j.core.lookup.MapLookup.newMap(I)Ljava/util/HashMap; from class org.apache.logging.log4j.core.lookup.MainMapLookup
These two classes should come from the same package in the same jar. Log4jServletContainerInitializer is in a different jar, which should not matter. Hm... how can this error happen? Could each class be loaded from different versions of the core jar? How is that even possible? Or did the web container explode the jars somehow? ... Gary On Thu, Oct 20, 2016 at 9:03 AM, Jeremy Heiler <jeremyhei...@gmail.com> wrote: > I have a Servlet 3.1 webapp running in Tomcat 8.0.32. I've upgraded from > log4j 2.1 to 2.7, and now I am getting the following error. The error > occurs in all versions >=2.4; it works when I downgrade to 2.3. As far as I > know, there is no other version of log4j on my classpath, unless Tomcat is > hiding something. None of my other depdendencies pull in log4j, as checked > by `mvn -Dverbose=true dependency:tree`. > > The MapLookup.newMap method appears to be package private, but that should > be accessible to MainMapLookup, which is in the same package. Any ideas on > what I'm doing wrong? > > 2016-10-20 11:57:42,260 DEBUG Starting LoggerContext[name= > WebappClassLoader > context: foo > delegate: false > ----------> Parent Classloader: > java.net.URLClassLoader@108c4c35 > ] from configuration at null > 2016-10-20 11:57:42,260 DEBUG Starting LoggerContext[name= > WebappClassLoader > context: foo > delegate: false > ----------> Parent Classloader: > java.net.URLClassLoader@108c4c35 > , org.apache.logging.log4j.core.LoggerContext@26745914] with configuration > XmlConfiguration[location=/Users/jeremy/acme/foo/target/ > foo-1.0/WEB-INF/classes/log4j2.xml]... > 2016-10-20 11:57:42,260 DEBUG Shutdown hook enabled. Registering a new one. > 2016-10-20 11:57:42,261 DEBUG Starting configuration > XmlConfiguration[location=/Users/jeremy/acme/foo/target/ > foo-1.0/WEB-INF/classes/log4j2.xml] > 2016-10-20 11:57:42,261 DEBUG PluginManager 'Core' found 108 plugins > 2016-10-20 11:57:42,261 DEBUG PluginManager 'Level' found 0 plugins > 2016-10-20 11:57:42,263 DEBUG PluginManager 'Lookup' found 14 plugins > 20-Oct-2016 11:57:42.264 SEVERE [RMI TCP Connection(2)-127.0.0.1] > org.apache.catalina.core.ContainerBase.addChildInternal > ContainerBase.addChild: start: > org.apache.catalina.LifecycleException: Failed to start component > [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/foo]] > at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153) > at > org.apache.catalina.core.ContainerBase.addChildInternal( > ContainerBase.java:725) > at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701) > at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717) > at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1692) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: > 62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke( > DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at > org.apache.tomcat.util.modeler.BaseModelMBean.invoke( > BaseModelMBean.java:300) > at > com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke( > DefaultMBeanServerInterceptor.java:819) > at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) > at > org.apache.catalina.mbeans.MBeanFactory.createStandardContext( > MBeanFactory.java:465) > at > org.apache.catalina.mbeans.MBeanFactory.createStandardContext( > MBeanFactory.java:415) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: > 62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke( > DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at > org.apache.tomcat.util.modeler.BaseModelMBean.invoke( > BaseModelMBean.java:300) > at > com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke( > DefaultMBeanServerInterceptor.java:819) > at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) > at > javax.management.remote.rmi.RMIConnectionImpl.doOperation( > RMIConnectionImpl.java:1468) > at > javax.management.remote.rmi.RMIConnectionImpl.access$300( > RMIConnectionImpl.java:76) > at > javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run( > RMIConnectionImpl.java:1309) > at > javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation( > RMIConnectionImpl.java:1401) > at > javax.management.remote.rmi.RMIConnectionImpl.invoke( > RMIConnectionImpl.java:829) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: > 62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke( > DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323) > at sun.rmi.transport.Transport$1.run(Transport.java:200) > at sun.rmi.transport.Transport$1.run(Transport.java:197) > at java.security.AccessController.doPrivileged(Native Method) > at sun.rmi.transport.Transport.serviceCall(Transport.java:196) > at sun.rmi.transport.tcp.TCPTransport.handleMessages( > TCPTransport.java:568) > at > sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0( > TCPTransport.java:826) > at > sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$ > 0(TCPTransport.java:683) > at java.security.AccessController.doPrivileged(Native Method) > at > sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run( > TCPTransport.java:682) > at > java.util.concurrent.ThreadPoolExecutor.runWorker( > ThreadPoolExecutor.java:1142) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run( > ThreadPoolExecutor.java:617) > at java.lang.Thread.run(Thread.java:745) > Caused by: java.lang.IllegalAccessError: tried to access method > org.apache.logging.log4j.core.lookup.MapLookup.newMap(I) > Ljava/util/HashMap; > from class org.apache.logging.log4j.core.lookup.MainMapLookup > at > org.apache.logging.log4j.core.lookup.MainMapLookup.<clinit>( > MainMapLookup.java:37) > at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) > at > sun.reflect.NativeConstructorAccessorImpl.newInstance( > NativeConstructorAccessorImpl.java:62) > at > sun.reflect.DelegatingConstructorAccessorImpl.newInstance( > DelegatingConstructorAccessorImpl.java:45) > at java.lang.reflect.Constructor.newInstance(Constructor.java:423) > at > org.apache.logging.log4j.core.util.ReflectionUtil. > instantiate(ReflectionUtil.java:185) > at > org.apache.logging.log4j.core.lookup.Interpolator.<init>( > Interpolator.java:65) > at > org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure( > AbstractConfiguration.java:346) > at > org.apache.logging.log4j.core.config.AbstractConfiguration. > start(AbstractConfiguration.java:161) > at > org.apache.logging.log4j.core.LoggerContext.setConfiguration( > LoggerContext.java:359) > at org.apache.logging.log4j.core.LoggerContext.start( > LoggerContext.java:169) > at > org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext( > Log4jContextFactory.java:204) > at > org.apache.logging.log4j.core.config.Configurator. > initialize(Configurator.java:110) > at > org.apache.logging.log4j.web.Log4jWebInitializerImpl.initializeNonJndi( > Log4jWebInitializerImpl.java:157) > at > org.apache.logging.log4j.web.Log4jWebInitializerImpl.start( > Log4jWebInitializerImpl.java:107) > at > org.apache.logging.log4j.web.Log4jServletContainerInitializer.onStartup( > Log4jServletContainerInitializer.java:57) > at > org.apache.catalina.core.StandardContext.startInternal( > StandardContext.java:5244) > at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) > ... 42 more > > <?xml version="1.0" encoding="UTF-8"?> > <Configuration status="trace"> > <Appenders> > <Console name="STDOUT" target="SYSTEM_OUT"> > <PatternLayout pattern="%d %-5p [%t] %m%n"/> > </Console> > <Console name="XSLOUT" target="SYSTEM_OUT"> > <PatternLayout pattern="%d %-5p [%t] %C (%F:%L) - %m%n"/> > </Console> > </Appenders> > <Loggers> > <Logger name="com.acme" level="debug" additivity="false"> > <AppenderRef ref="STDOUT"/> > </Logger> > <Logger name="org.apache.fop" level="warn" additivity="false"> > <AppenderRef ref="XSLOUT"/> > </Logger> > </Loggers> > </Configuration> > > Thanks, > ;; Jeremy > -- E-Mail: garydgreg...@gmail.com | ggreg...@apache.org Java Persistence with Hibernate, Second Edition <https://www.amazon.com/gp/product/1617290459/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1617290459&linkCode=as2&tag=garygregory-20&linkId=cadb800f39946ec62ea2b1af9fe6a2b8> <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=1617290459> JUnit in Action, Second Edition <https://www.amazon.com/gp/product/1935182021/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1935182021&linkCode=as2&tag=garygregory-20&linkId=31ecd1f6b6d1eaf8886ac902a24de418%22> <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=1935182021> Spring Batch in Action <https://www.amazon.com/gp/product/1935182951/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1935182951&linkCode=%7B%7BlinkCode%7D%7D&tag=garygregory-20&linkId=%7B%7Blink_id%7D%7D%22%3ESpring+Batch+in+Action> <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=1935182951> Blog: http://garygregory.wordpress.com Home: http://garygregory.com/ Tweet! http://twitter.com/GaryGregory
