Hello, I wish you a happy new year! Concerning JBoss 5 Beta 1 I have similar problems mentioned above on a linux box.I start the application server jboss-5.0.0.Beta1 with jdk1.6.0_01. The first time I start the application server I get only the message: JBoss Messaging Warning: DataSource connection transaction isolation should be READ_COMMITTED, but it is currently NONE. | Using an isolation level less strict than READ_COMMITTED may lead to data consistency problems. | Using an isolation level more strict than READ_COMMITTED may lead to deadlock. Should I therefore adapt the isolation level in the file hsqldb-ds.xml? The scond time I get in addition the following Exceptions: 11:24:53,768 ERROR [BaseModelMBean] Exception invoking method addChild | java.lang.RuntimeException: org.jboss.xb.binding.JBossXBException: Failed to parse source: Bad file descriptor | at org.jboss.web.tomcat.tc6.TomcatInjectionContainer.processMetadata(TomcatInjectionContainer.java:264) | at org.jboss.web.tomcat.tc6.WebAppLoader.start(WebAppLoader.java:104) | .. | 11:24:53,787 ERROR [BaseModelMBean] Exception invoking method init | LifecycleException: Manager has not yet been started | at org.apache.catalina.session.StandardManager.stop(StandardManager.java:660) | .. By the way, do you have a description how to check out the latest version of jboss application server 5 from subversion and how to build it? Thanks and best regards, Frank View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3997101#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...