call sql procedure from java

Try this Integer returnValue = (Integer) cs.getObject(1); after Ebean.execute(cs); And post it here What it gives ?

Update :Make the follwing changes to your code

Ebean.beginTransaction();  
try {  
String sql = "call copy_lov_Countries(?)";
CallableSql cs = Ebean.createCallableSql(sql);
cs.registerOut(1, Types.INTEGER);
Ebean.execute(cs);

 } finally {  
   Ebean.endTransaction();  
}  

Try this:

String sql = "CALL copy_lov_Countries(:param)";
CallableStatement statement = connection.prepareCall(sql);
statement.registerOutParameter("param", Types.INTEGER);
statement.execute();
connection.commit();

The code works with Oracle, should work also with MySQL. The principle is same.