[ 
https://issues.apache.org/jira/browse/WW-4659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Lukasz Lenart updated WW-4659:
------------------------------
    Description: 
My code compiles fine and my app deploys to Tomcat 8 but I'm getting the 
following error in my Tomcat localhost log when the app attempts to start. Any 
ideas on how to resolve this (or even how to get further debug info for where 
the issue is)?

I have enabled FINE logging on the localhost log and found several other 
filters starting with no exceptions (see below updated log output). Why is the 
struts2 filter specifically having issues and all of these other filters aren't?

Also as a test, I commented out the struts2 filter 
(org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter for me) 
and the application installs and starts with no issues. So, the problem is 
certainly localized to the struts2 filter.

from my tomcat localhost log...
{noformat}
13-Jul-2016 16:22:34.847 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.listenerStart Sending application 
start events
13-Jul-2016 16:22:35.225 INFO [http-nio-8080-exec-1] 
org.apache.catalina.core.ApplicationContext.log Initializing Spring root 
WebApplicationContext
13-Jul-2016 16:22:36.224 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart Starting filters
13-Jul-2016 16:22:36.224 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 
'ApplicationInitFilter'
13-Jul-2016 16:22:53.465 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 
'monitoring'
13-Jul-2016 16:22:53.846 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 'Tomcat 
WebSocket (JSR356) Filter'
13-Jul-2016 16:22:53.846 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 
'springSecurityFilterChain'
13-Jul-2016 16:22:53.848 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 
'javamelody'
13-Jul-2016 16:22:53.848 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 'struts2'
13-Jul-2016 16:22:54.534 SEVERE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart Exception starting filter 
struts2
 java.lang.IncompatibleClassChangeError: Implementing class
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2541)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:858)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1301)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2541)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:858)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1301)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
        at 
org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildClassFinder(PackageBasedActionConfigBuilder.java:416)
        at 
org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:397)
        at 
org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:354)
        at 
org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:53)
        at 
com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:274)
        at 
com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
        at 
org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:970)
        at 
org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:438)
        at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:482)
        at 
org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
        at 
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57)
        at 
org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
        at 
org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
        at 
org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
        at 
org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4689)
        at 
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5329)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
        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.deployDirectory(HostConfig.java:1092)
        at 
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:473)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1612)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        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.manager.ManagerServlet.check(ManagerServlet.java:1451)
        at 
org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:897)
        at 
org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:335)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
        at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)

13-Jul-2016 16:22:54.541 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop Stopping filters
13-Jul-2016 16:22:54.541 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
'ApplicationInitFilter'
13-Jul-2016 16:22:54.564 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
'monitoring'
13-Jul-2016 16:22:54.781 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 'Tomcat 
WebSocket (JSR356) Filter'
13-Jul-2016 16:22:54.781 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
'javamelody'
13-Jul-2016 16:22:54.781 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
'springSecurityFilterChain'
13-Jul-2016 16:22:54.781 INFO [http-nio-8080-exec-1] 
org.apache.catalina.core.ApplicationContext.log Closing Spring root 
WebApplicationContext
{noformat}

  was:
My code compiles fine and my app deploys to Tomcat 8 but I'm getting the 
following error in my Tomcat localhost log when the app attempts to start. Any 
ideas on how to resolve this (or even how to get further debug info for where 
the issue is)?

I have enabled FINE logging on the localhost log and found several other 
filters starting with no exceptions (see below updated log output). Why is the 
struts2 filter specifically having issues and all of these other filters aren't?

Also as a test, I commented out the struts2 filter 
(org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter for me) 
and the application installs and starts with no issues. So, the problem is 
certainly localized to the struts2 filter.

from my tomcat localhost log...

13-Jul-2016 16:22:34.847 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.listenerStart Sending application 
start events
13-Jul-2016 16:22:35.225 INFO [http-nio-8080-exec-1] 
org.apache.catalina.core.ApplicationContext.log Initializing Spring root 
WebApplicationContext
13-Jul-2016 16:22:36.224 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart Starting filters
13-Jul-2016 16:22:36.224 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 
'ApplicationInitFilter'
13-Jul-2016 16:22:53.465 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 
'monitoring'
13-Jul-2016 16:22:53.846 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 'Tomcat 
WebSocket (JSR356) Filter'
13-Jul-2016 16:22:53.846 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 
'springSecurityFilterChain'
13-Jul-2016 16:22:53.848 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 
'javamelody'
13-Jul-2016 16:22:53.848 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart  Starting filter 'struts2'
13-Jul-2016 16:22:54.534 SEVERE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStart Exception starting filter 
struts2
 java.lang.IncompatibleClassChangeError: Implementing class
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2541)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:858)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1301)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2541)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:858)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1301)
        at 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
        at 
org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildClassFinder(PackageBasedActionConfigBuilder.java:416)
        at 
org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:397)
        at 
org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:354)
        at 
org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:53)
        at 
com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:274)
        at 
com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
        at 
org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:970)
        at 
org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:438)
        at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:482)
        at 
org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
        at 
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57)
        at 
org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
        at 
org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
        at 
org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
        at 
org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4689)
        at 
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5329)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
        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.deployDirectory(HostConfig.java:1092)
        at 
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:473)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1612)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        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.manager.ManagerServlet.check(ManagerServlet.java:1451)
        at 
org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:897)
        at 
org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:335)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
        at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)

13-Jul-2016 16:22:54.541 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop Stopping filters
13-Jul-2016 16:22:54.541 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
'ApplicationInitFilter'
13-Jul-2016 16:22:54.564 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
'monitoring'
13-Jul-2016 16:22:54.781 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 'Tomcat 
WebSocket (JSR356) Filter'
13-Jul-2016 16:22:54.781 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
'javamelody'
13-Jul-2016 16:22:54.781 FINE [http-nio-8080-exec-1] 
org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
'springSecurityFilterChain'
13-Jul-2016 16:22:54.781 INFO [http-nio-8080-exec-1] 
org.apache.catalina.core.ApplicationContext.log Closing Spring root 
WebApplicationContext


> Exception starting filter struts2 java.lang.IncompatibleClassChangeError: 
> Implementing class 
> ---------------------------------------------------------------------------------------------
>
>                 Key: WW-4659
>                 URL: https://issues.apache.org/jira/browse/WW-4659
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Dispatch Filter
>    Affects Versions: 2.3.28
>         Environment: Ubuntu 16.04 LTS, JDK 7, Tomcat 8
>            Reporter: Zack Macomber
>            Priority: Blocker
>             Fix For: 2.3.31
>
>
> My code compiles fine and my app deploys to Tomcat 8 but I'm getting the 
> following error in my Tomcat localhost log when the app attempts to start. 
> Any ideas on how to resolve this (or even how to get further debug info for 
> where the issue is)?
> I have enabled FINE logging on the localhost log and found several other 
> filters starting with no exceptions (see below updated log output). Why is 
> the struts2 filter specifically having issues and all of these other filters 
> aren't?
> Also as a test, I commented out the struts2 filter 
> (org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter for 
> me) and the application installs and starts with no issues. So, the problem 
> is certainly localized to the struts2 filter.
> from my tomcat localhost log...
> {noformat}
> 13-Jul-2016 16:22:34.847 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.listenerStart Sending application 
> start events
> 13-Jul-2016 16:22:35.225 INFO [http-nio-8080-exec-1] 
> org.apache.catalina.core.ApplicationContext.log Initializing Spring root 
> WebApplicationContext
> 13-Jul-2016 16:22:36.224 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStart Starting filters
> 13-Jul-2016 16:22:36.224 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStart  Starting filter 
> 'ApplicationInitFilter'
> 13-Jul-2016 16:22:53.465 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStart  Starting filter 
> 'monitoring'
> 13-Jul-2016 16:22:53.846 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStart  Starting filter 'Tomcat 
> WebSocket (JSR356) Filter'
> 13-Jul-2016 16:22:53.846 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStart  Starting filter 
> 'springSecurityFilterChain'
> 13-Jul-2016 16:22:53.848 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStart  Starting filter 
> 'javamelody'
> 13-Jul-2016 16:22:53.848 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStart  Starting filter 
> 'struts2'
> 13-Jul-2016 16:22:54.534 SEVERE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStart Exception starting 
> filter struts2
>  java.lang.IncompatibleClassChangeError: Implementing class
>       at java.lang.ClassLoader.defineClass1(Native Method)
>       at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
>       at 
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
>       at 
> org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2541)
>       at 
> org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:858)
>       at 
> org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1301)
>       at 
> org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
>       at java.lang.ClassLoader.defineClass1(Native Method)
>       at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
>       at 
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
>       at 
> org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2541)
>       at 
> org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:858)
>       at 
> org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1301)
>       at 
> org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
>       at 
> org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildClassFinder(PackageBasedActionConfigBuilder.java:416)
>       at 
> org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:397)
>       at 
> org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:354)
>       at 
> org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:53)
>       at 
> com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:274)
>       at 
> com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
>       at 
> org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:970)
>       at 
> org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:438)
>       at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:482)
>       at 
> org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
>       at 
> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57)
>       at 
> org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
>       at 
> org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
>       at 
> org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
>       at 
> org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4689)
>       at 
> org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5329)
>       at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
>       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.deployDirectory(HostConfig.java:1092)
>       at 
> org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:473)
>       at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1612)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       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.manager.ManagerServlet.check(ManagerServlet.java:1451)
>       at 
> org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:897)
>       at 
> org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:335)
>       at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
>       at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
>       at 
> org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
>       at 
> org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
>       at 
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
>       at 
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
>       at 
> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
>       at 
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
>       at 
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
>       at 
> org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
>       at 
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
>       at 
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
>       at 
> org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
>       at 
> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)
>       at 
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
>       at 
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>       at 
> org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
>       at java.lang.Thread.run(Thread.java:745)
> 13-Jul-2016 16:22:54.541 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStop Stopping filters
> 13-Jul-2016 16:22:54.541 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
> 'ApplicationInitFilter'
> 13-Jul-2016 16:22:54.564 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
> 'monitoring'
> 13-Jul-2016 16:22:54.781 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStop  Stopping filter 'Tomcat 
> WebSocket (JSR356) Filter'
> 13-Jul-2016 16:22:54.781 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
> 'javamelody'
> 13-Jul-2016 16:22:54.781 FINE [http-nio-8080-exec-1] 
> org.apache.catalina.core.StandardContext.filterStop  Stopping filter 
> 'springSecurityFilterChain'
> 13-Jul-2016 16:22:54.781 INFO [http-nio-8080-exec-1] 
> org.apache.catalina.core.ApplicationContext.log Closing Spring root 
> WebApplicationContext
> {noformat}



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