[rules-users] Reloading knowledge base from another thread
Hi everybody!
I'm using Drools 5.4.0.Final.
I'm checking changes in knowledge repository and if there is any - update
knowledge base.
The changes listening I perform like described in article:
https://community.jboss.org/wiki/PublishDroolsArtifactsFromAProductionEnv....
Updating knowledge base code:
private static final Environment JBPM_ENVIRONMENT =
KnowledgeBaseFactory.newEnvironment();
private static final KnowledgeSessionConfiguration JBPM_CONFIG;
static {
JBPM_ENVIRONMENT.set(EnvironmentName.ENTITY_MANAGER_FACTORY,
Persistence.createEntityManagerFactory("org.jbpm.persistence.jpa"));
JBPM_ENVIRONMENT.set(EnvironmentName.TRANSACTION_MANAGER,
TransactionManagerServices.getTransactionManager());
JBPM_ENVIRONMENT.set(EnvironmentName.GLOBALS, new
MapGlobalResolver());
Properties properties = new Properties();
properties.put("drools.processInstanceManagerFactory",
"org.jbpm.persistence.processinstance.JPAProcessInstanceManagerFactory");
properties.put("drools.processSignalManagerFactory",
"org.jbpm.persistence.processinstance.JPASignalManagerFactory");
JBPM_CONFIG =
KnowledgeBaseFactory.newKnowledgeSessionConfiguration(properties);
}
....
private static StatefulKnowledgeSession createSession() {
StatefulKnowledgeSession session =
JPAKnowledgeService.newStatefulKnowledgeSession(readKnowledgeBase(),
JBPM_CONFIG, JBPM_ENVIRONMENT);
session.getWorkItemManager().registerWorkItemHandler("Human Task",
new CommandBasedWSHumanTaskHandler(session));
return session;
}
When I load changes from main thread (on startup, for example) everything is
fine, but when I try to reload knowledge base from another thread it falls
with exception ( full stacktrace
<http://drools.46999.n3.nabble.com/file/n4020008/error_log.txt> ):
15:00:56,420 ERROR [org.drools.persistence.SingleSessionCommandService]
(Timer-14) Could not commit session: java.lang.NullPointerException
at
org.drools.persistence.jta.JtaTransactionManager.getStatus(JtaTransactionManager.java:205)
[drools-persistence-jpa-5.4.0.Final.jar:5.4.0.Final]
How can I solve it?
Thank you for your attention. Have a good day!
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