Failed to start component [de.javakaffee.web.msm.MemcachedBackupSessionManager[/examples]]

Samebug tips9

A few things cause this exception: 1) Check if you have all jars and if they're in the correct path when running. 2) Your classpath might be broken, you can define it in the command line with "java -cp yourClassPath" or at your IDE if you're using one.


If you're using Hibernate, this indicates you're missing FasterXML Classmate dependency, which you can add to your dependencies. To add it, the groupId is com.fasterxml and artifactId is Classmate.


Don't give up yet. Our experts can help. Paste your full stack trace to get a solution.

Solutions on the web17798

  • via Unknown by Raja Patil,
  • via Stack Overflow by ccc
  • via Stack Overflow by user3806428
  • Stack trace

    • org.apache.catalina.LifecycleException: Failed to start component [de.javakaffee.web.msm.MemcachedBackupSessionManager[/examples]] at org.apache.catalina.util.LifecycleBase.start( at org.apache.catalina.core.StandardContext.startInternal( at org.apache.catalina.util.LifecycleBase.start( at org.apache.catalina.core.ContainerBase.addChildInternal( at org.apache.catalina.core.ContainerBase.addChild( at org.apache.catalina.core.StandardHost.addChild( at org.apache.catalina.startup.HostConfig.deployDirectory( at org.apache.catalina.startup.HostConfig$ at java.util.concurrent.Executors$ at java.util.concurrent.FutureTask$Sync.innerRun( at at java.util.concurrent.ThreadPoolExecutor.runWorker( at java.util.concurrent.ThreadPoolExecutor$ at Caused by: java.lang.NoClassDefFoundError: org/jboss
    • etty/channel/ChannelPipelineFactory at net.spy.memcached.vbucket.ConfigurationProviderHTTP.subscribe( at net.spy.memcached.MemcachedClient.<init>( at net.spy.memcached.MemcachedClient.<init>( at net.spy.memcached.MemcachedClient.<init>( at de.javakaffee.web.msm.MemcachedSessionService.createMemcachedClient( at de.javakaffee.web.msm.MemcachedSessionService.startInternal( at de.javakaffee.web.msm.MemcachedBackupSessionManager.startInternal( at org.apache.catalina.util.LifecycleBase.start( ... 13 more Caused by: java.lang.ClassNotFoundException: at$ at Method) at at java.lang.ClassLoader.loadClass( at java.lang.ClassLoader.loadClass( ... 21 more

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