I'm seeing this failure trying to deploy a test ear:

java.lang.InternalError: jzentry == 0,
 jzfile = 147726040,
 total = 6,
 name = /home/svn/JBossHead/jboss-head/testsuite/output/lib/manifest-web.ear,
 i = 4,
 message = invalid LOC header (bad signature)
 at java.util.zip.ZipFile$3.nextElement(ZipFile.java:429)
 at java.util.zip.ZipFile$3.nextElement(ZipFile.java:415)
 at java.util.jar.JarFile$1.nextElement(JarFile.java:221)
 at java.util.jar.JarFile$1.nextElement(JarFile.java:220)
 at org.jboss.virtual.plugins.context.jar.AbstractJarHandler.initJarFile(AbstractJarHandler.java:138)
 at org.jboss.virtual.plugins.context.jar.JarHandler.<init>(JarHandler.java:60)
 at org.jboss.virtual.plugins.context.file.FileSystemContext.createVirtualFileHandler(FileSystemContext.java:180)
 at org.jboss.virtual.plugins.context.file.FileSystemContext.<init>(FileSystemContext.java:150)
 at org.jboss.virtual.plugins.context.file.FileSystemContext.<init>(FileSystemContext.java:124)
 at org.jboss.virtual.plugins.context.file.FileSystemContext.<init>(FileSystemContext.java:113)
 at org.jboss.virtual.plugins.context.file.FileSystemContextFactory.getVFS(FileSystemContextFactory.java:54)
 at org.jboss.virtual.VFS.getVFS(VFS.java:106)
 at org.jboss.virtual.VFS.getRoot(VFS.java:120)
 at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:791)
 at org.jboss.deployment.MainDeployer.redeploy(MainDeployer.java:570)
 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:157)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
 at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.jboss.jmx.connector.invoker.InvokerAdaptorService.invoke(InvokerAdaptorService.java:266)
 at sun.reflect.GeneratedMethodAccessor90.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:157)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
 at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:138)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:90)
 at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:140)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:90)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
 at org.jboss.invocation.jrmp.server.JRMPProxyFactory.invoke(JRMPProxyFactory.java:179)
 at sun.reflect.GeneratedMethodAccessor89.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:157)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
 at org.jboss.invocation.jrmp.server.JRMPInvoker$MBeanServerAction.invoke(JRMPInvoker.java:816)
 at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:417)
 at sun.reflect.GeneratedMethodAccessor88.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
 at sun.rmi.transport.Transport$1.run(Transport.java:153)
 at java.security.AccessController.doPrivileged(Native Method)
 at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
 at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:466)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:707)
 at java.lang.Thread.run(Thread.java:595)

Other ears are working so I'm not sure what the issue is. Searching for this error indicates its a problem with not closing the jar file.