Stefano Campanini [http://community.jboss.org/people/campa] replied to the discussion "JBPM 4.3 - org.jbpm.api.JbpmException: couldn't acquire block of ids" To view the discussion, visit: http://community.jboss.org/message/539800#539800 -------------------------------------------------------------- Hi guys, I'm back ... with new energies :-) The problem was related to org.jbpm.pvm.internal.id.DatabaseDbidGenerator and precisely on AcquireDbidBlockCmd it use. I have re-implmented these classes using sequence to generate ids, as below: ... public class SequenceDbIdGenerator extends DbidGenerator {        CommandService commandService;         @Override     public long getNextId() {         return commandService.execute(new SequenceDbIdGeneratorCmd());     } } ... and ... public class SequenceDbIdGeneratorCmd implements Command<Long> {     private static final long serialVersionUID = -8109570788517494372L;     @SuppressWarnings("unchecked")     @Override     public Long execute(Environment environment) throws Exception {         Session session = environment.get(Session.class);         List<BigInteger> res = session.createSQLQuery(                 "select nextval('jbpm_seq_external_id')").list();         return res.get(0).longValue();     } } and i the jbpm config file: ... <object class="net.tinvention.wf.jbpm.SequenceDbIdGenerator"> <field name="commandService"><ref object="txRequiredCommandService" /></field> </object> <object class="org.jbpm.pvm.internal.id.DatabaseIdComposer" init="eager" /> Does anyone more expert on jbpm can validate ? Do you see any hidden disaster or this solution can work ? Thanks in advance Stefano -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/539800#539800] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]