[jboss-user] [JBoss Seam] - Problem running examples from Seam 2.0.0 Beta on Tomcat

[Stateless Bean]

When I run compiled examples "ant deploy.tomcat", into tomcat my webapps, I get:

anonymous wrote : 
  | SEVERE: Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener
  | java.lang.NoClassDefFoundError: javassist/bytecode/ClassFile
  | 	at org.jboss.seam.deployment.Scanner.(Scanner.java:51)
  | 	at org.jboss.seam.deployment.Scanner.(Scanner.java:44)
  | 	at org.jboss.seam.deployment.NamespaceScanner.(NamespaceScanner.java:24)
  | 	at org.jboss.seam.init.Initialization.addNamespaces(Initialization.java:732)
  | 	at org.jboss.seam.init.Initialization.create(Initialization.java:83)
  | 	at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:34)
  | 	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3764)
  | 	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4216)
  | 	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
  | 	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
  | 	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
  | 	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:825)
  | 	at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:714)
  | 	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:490)
  | 	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
  | 	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
  | 	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
  | 	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
  | 	at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
  | 	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
  | 	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
  | 	at org.apache.catalina.core.StandardService.start(StandardService.java:448)
  | 	at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
  | 	at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  | 	at java.lang.reflect.Method.invoke(Unknown Source)
  | 	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
  | 	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
  | 2007-08-02 19:39:28 org.apache.catalina.core.StandardContext start

any ideas?

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