these days I was having problems with my CDO server:
after inserting some models into a repository, and then restarting the server, I was getting this error:
[ERROR] Rollback in DBStore: org.eclipse.net4j.db.DBException: SQL Exception: A lock could not be obtained within the time requested
First, I thought, I forgot to commit/close a transaction; but this was not the case.
In the emf news group, eike told me, that there was a similar problem in the tests based on apache derby.
So, I switched to H2, and the error did not occur anymore.
I was desperately looking for the net4j H2Adapter in the latest net4j releases but was not able to find it. Finally, I found it here, copied to my workspace, and changed the creation of the IStore:
org.h2.jdbcx.JdbcDataSource dataSource = new JdbcDataSource();
IDBAdapter dbAdapter = new H2Adapter();
IMappingStrategy mappingStrategy = CDODBUtil.createHorizontalMappingStrategy(true);
IDBConnectionProvider dbConnectionProvider = DBUtil.createConnectionProvider(dataSource);
IStore store = CDODBUtil.createStore(mappingStrategy, dbAdapter, dbConnectionProvider);