I am trying to deploy EJB 3.o on Jboss 4.0.4 after upgrading with jboss-EJB-3.0_RC9_Patch_1 (Windows), I followed the steps mentioned in the installation guide. After that when I try to deploy my application with following ejb-jar.xml file it throws error ejb-jar.xml <?xml version="1.0" encoding="UTF-8"?> <ejb-jar xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd" version="3.0"> </ejb-jar> Error 2007-11-03 11:41:19,687 DEBUG [org.jboss.util.NestedThrowable] org.jboss.util.NestedThrowable.parentTraceEnabled=true 2007-11-03 11:41:19,687 DEBUG [org.jboss.util.NestedThrowable] org.jboss.util.NestedThrowable.nestedTraceEnabled=false 2007-11-03 11:41:19,687 DEBUG [org.jboss.util.NestedThrowable] org.jboss.util.NestedThrowable.detectDuplicateNesting=true 2007-11-03 11:41:19,687 ERROR [org.jboss.deployment.MainDeployer] Could not create deployment: file:/D:/Jboss/jboss-4.0.4.GA/server/default/deploy/first-ejb3-tutorial.jar/ org.jboss.deployment.DeploymentException: ejb-jar.xml must either obey the right xml schema or define a valid DOCTYPE! at org.jboss.metadata.ApplicationMetaData.importEjbJarXml(ApplicationMetaData.java:339) at org.jboss.metadata.XmlFileLoader.load(XmlFileLoader.java:166) at org.jboss.ejb.EJBDeployer.create(EJBDeployer.java:541) 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:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142) at org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:97) at org.jboss.system.InterceptorServiceMBeanSupport.invokeNext(InterceptorServiceMBeanSupport.java:238) at org.jboss.ws.server.WebServiceDeployer.create(WebServiceDeployer.java:99) at org.jboss.deployment.SubDeployerInterceptorSupport$XMBeanInterceptor.create(SubDeployerInterceptorSupport.java:180) at org.jboss.deployment.SubDeployerInterceptor.invoke(SubDeployerInterceptor.java:91) Can anybody help to solve this. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4110083#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...