However, in jboss 4.0.3SP1, it gives this which does not tell the exact hibernate 3 version. <jar name='hibernate3.jar' specVersion='4.0.3' specVendor='JBoss (http://www.jboss.org/)' specTitle='JBoss' implVersion='4.0.3SP1 (build: CVSTag=JBoss_4_0_3_SP1 date=200510241213)' implVendor='JBoss Inc.' implTitle='JBoss [Zion]' implVendorID='http://www.jboss.org/' implURL='http://www.jboss.org/' sealed='false' md5Digest='99d240a518004cf70d64e0a9484a169b' /> Between, if i were to replace the hibernate3.jar in jboss with a newer version, how can i be sure that other jar will be compatible with the hibernate3.jar that I put in manually? Thank you. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3974381#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...