Problem deploying simple war file in jboss

I am using eclipse with jboss-ide and jboss-4.0.
I get this problem when deploying a simple war file (with only web.xml in WEB-INF folder). I experiment the same war file in tomcat 5.5 and got no such problem. Would anybody know why this is happening?

Problem in init
java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(String.java:558)
at org.jboss.util.file.JarUtils.unjar(JarUtils.java:252)
at org.jboss.web.AbstractWebContainer.init(AbstractWebContainer.java:262)
at org.jboss.deployment.MainDeployer.init(MainDeployer.java:799)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:736)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:709)
at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:119)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:131)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:242)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
at $Proxy8.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:305)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:481)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:204)
at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:277)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:271)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:221)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:242)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:891)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:416)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:242)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
at $Proxy4.start(Unknown Source)
at org.jboss.deployment.SARDeployer.start(SARDeployer.java:261)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:935)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:746)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:709)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:693)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:119)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:131)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:242)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
at $Proxy5.deploy(Unknown Source)
at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:396)
at org.jboss.system.server.ServerImpl.start(ServerImpl.java:293)
at org.jboss.Main.boot(Main.java:151)
at org.jboss.Main$1.run(Main.java:405)
at java.lang.Thread.run(Thread.java:595)

JBoss don't like an empty module. I know it's a problem to deploy an ejb-module which contains no bean. Just like what you are doing.

I have the same problem when I was using JBOSS-IDE and Eclipse to generate war file. After I extract all files to a folder and use winzip to zip them to a war file. It works fine.