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Never heard of MAXDB, but its not much about JBoss AS supporting MAXDB but whether the JDBC driver for MAXDB is good enough. Also, IMHO JBoss will not "officially" support MAXDB.
it is not a problem of Jboss or JPA, the only question if is it still supported by hibernate 4.
you can see that there is dialect for maxdb/sapdb: org.hibernate.dialect.SAPDBDialect
Can you check what kind of dialect are you using? If you dont have it explicitly set, check what does it says in log when it creates EntityMangerFactory