Thank you both very much for taking the time to reply. :-) As you correctly said Andy, what I am looking for is to have a persistent attribute with multiple cardinality in my entity.
I know I could simply define another entity and then use @OneToMany to define an association. In this case, however, the attribute is very simple (just a List of Strings or an array of longs), and it is only useful in the context of the parent entity - in short there's no real need to define a separate entity. That's why I thought to reduce the granularity of the entity interface by making it a simple attribute with multiple cardinality. I am a little surprised that the EJB3 specification doesn't support this requirement, and I had hoped to avoid using vendor specific extensions to the spec. It seems that's not feasable in this case, so I tried your solution and I'm glad to say it seems to work. :-) @CollectionOfElements | public List<String> getStringList() { | return _stringList; | } | | public void setStringList(List<String> stringList) { | _stringList = stringList; | } | | @CollectionOfElements | @IndexColumn(name="longArray_index") | public long[] getLongArray() { | return _longArray; | } | | public void setLongArray(long[] longArray) { | _longArray = longArray; | } Now when I start the server, it deploys the entity and creates a set of 3 tables in the (mysql) database: simpleentity, simpleentity_longarray and simpleentity_stringlist. The strange thing is that I now get the following series of warnings during startup: | 13:22:57,651 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,651 WARN [JDBCExceptionReporter] Unknown table 'simpleentity' | 13:22:57,666 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,666 WARN [JDBCExceptionReporter] Unknown table 'simpleentity' | 13:22:57,713 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,713 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_longarray' | 13:22:57,713 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,713 WARN [JDBCExceptionReporter] Unknown table 'simpleentity' | 13:22:57,713 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,713 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_longarray' | 13:22:57,713 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,713 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_stringlist' | 13:22:57,744 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,744 WARN [JDBCExceptionReporter] Unknown table 'simpleentity' | 13:22:57,744 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,744 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_longarray' | 13:22:57,744 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,744 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_stringlist' | 13:22:57,869 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,869 WARN [JDBCExceptionReporter] Unknown table 'simpleentity' | 13:22:57,869 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,869 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_longarray' | 13:22:57,869 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:57,869 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_stringlist' | 13:22:58,009 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:58,009 WARN [JDBCExceptionReporter] Unknown table 'simpleentity' | 13:22:58,009 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:58,009 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_longarray' | 13:22:58,009 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:58,009 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_stringlist' | 13:22:58,087 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:58,087 WARN [JDBCExceptionReporter] Unknown table 'simpleentity' | 13:22:58,087 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:58,087 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_longarray' | 13:22:58,087 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:58,087 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_stringlist' | 13:22:58,181 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:58,181 WARN [JDBCExceptionReporter] Unknown table 'simpleentity' | 13:22:58,181 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:58,181 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_longarray' | 13:22:58,181 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02 | 13:22:58,181 WARN [JDBCExceptionReporter] Unknown table 'simpleentity_stringlist' | As I mentioned above, I checked the database and it definitely does have the 3 listed tables in it. I'll dig deeper in to the hibernate documentation and let you know how I go. Thanks again very much for your help, Adam View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3977853#3977853 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3977853 _______________________________________________ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user