I am using jboss-4.0.5.GA for project deployment, but it is hanging at startup by displaying message
Trying to install an already registered mbean: jboss.management.local
it is showing this for 6 minutes and it takes total 7-8 minutes to start. If I start server without deploying application, then also it's taking 7 to 8 min.
You seem to have corrupted the JBoss installation, highly reccomended to use a fresh installation and deploy your application rather than debug this.