anonymous wrote : log4j:WARN The content of element type "root" must match "(param*,(priority|level)?,appender-ref*)" It looks like you made some change in the jboss-log4j.xml file and the change is incorrect. This change is possibly preventing the rest of the console log output from being displayed (or did you change the Threshold setting for the console log?) Your default-ds.xml file uses the jndi-name DefaultDS. There is already a DefaultDS declare in the file hsqldb-ds.xml. Two data sources cannot have the same jndi name. Or did you remove hsqldb-ds.xml? Let me point out that it is impossible for anyone to help you if you do not say what kind of changes you have made, and apparently you have made several changes yet have not made any statement other than "I cannot successfully start the Jboss App Server 4.2.2 without error". View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4130851#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...