I am sorry to Jaikiran and thank you. I caught the crux of the problem for i couldn't start the server. There is a Equipment named 'nul' in dos ,but it was wrong in my windows system,maybe it was sabotaged.When I deploymented PostgreSQL 8.2,the wrong messages same to them in Jboss4.2 Finially,I judged the crux was at the windows system.I changed one windows system,Jboss and PostgreSQL were ok. The probleme wasted me a lot of time.So sad. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4111429#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...