[jboss-user] [jBPM] - JBPM 4.3 - org.jbpm.api.JbpmException: couldn't acquire block of ids
Stefano Campanini
do-not-reply at jboss.com
Tue Apr 27 10:07:31 EDT 2010
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
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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
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