See Thread at: http://www.techienuggets.com/Detail?tx=64374 Posted on behalf of a User Does anybody know if this issue is due to a bug in JBoss 5? If so, does anybody know about a workaround? I'm having exactly the same issue. I decided to create a very simple Web application which does nothing, and got the same error when deploying. Thanks in advance! In Response To: I just downloaded JBoss-5.0.0.GA. (released a few days ago) . I am trying to configure with a configuration that worked flawlessly in JBoss 4.21 using an expanded war file (directory) named laser.war. The following error is generated: 23:17:19,758 ERROR [AbstractKernelController] Error installing to Start: name=jboss.web.deployment:war=/lasser state=Create mode=Manual requiredState=Installed org.jboss.deployers.spi.DeploymentException: URL vfsfile:/opt/jboss-5.0.0.GA/server/default/deploy/lasser.war/ deployment failed at org.jboss.deployers.spi.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:49) at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeployInternal(TomcatDeployment.java:373) at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy(TomcatDeployment.java:146) at org.jboss.web.deployers.AbstractWarDeployment.start(AbstractWarDeployment.java:460) at org.jboss.web.deployers.WebModule.startModule(WebModule.java:118) at org.jboss.web.deployers.WebModule.start(WebModule.java:96) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) Caused by: LifecycleException: Error initializaing : javax.management.ReflectionException: Cannot find method addChild with this signature at org.apache.catalina.core.StandardContext.start(StandardContext.java:4150) at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeployInternal(TomcatDeployment.java:367) ... 55 more Is there some sort of config file for Tomcat that I am missing? Any suggestions? Thx. Mike