[jboss-jira] [JBoss JIRA] (DROOLS-102) Error inserting facts after session restore

[Mario Fusco (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved DROOLS-102.
--------------------------------

    Fix Version/s: 5.5.1.Final
       Resolution: Done

    
> Error inserting facts after session restore 
> --------------------------------------------
>
>                 Key: DROOLS-102
>                 URL: https://issues.jboss.org/browse/DROOLS-102
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 5.5.0.Final
>         Environment: JBoss AS 5.0
> Drools 5.4.0 / 5.5.0
> Linux Ubuntu
> JDK 1.6
>            Reporter: Nedo Nedic
>            Assignee: Mario Fusco
>              Labels: drools-core
>             Fix For: 5.5.1.Final
>
>
> I'm using Drools 5.4.0 (but also tried it with the last release of Drools 5.5.0) to save the session state when the application server restarts / stops. Everything works fine and the session state is properly restored, but when new fact is inserted the following exception is thrown:
> java.lang.NullPointerException
>         at java.lang.Class.isAssignableFrom(Native Method)
>         at org.drools.reteoo.ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:57)
>         at org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:68)
>         at org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:53)
>         at org.drools.common.NamedEntryPoint.createHandle(NamedEntryPoint.java:745)
>         at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:287)
>         at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:888)
>         at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)
>         at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)
> I explored through Drools code, and figured out time stamp extractor getExtractToClass method is evaluating to null (line 57 ReteooFactHandleFactory):
> public final InternalFactHandle newFactHandle(final int id,
>                                                   final Object object,
>                                                   final long recency,
>                                                   final ObjectTypeConf conf,
>                                                   final InternalWorkingMemory workingMemory,
>                                                   final WorkingMemoryEntryPoint wmEntryPoint) {
>         if ( conf != null && conf.isEvent() ) {
>             TypeDeclaration type = conf.getTypeDeclaration();
>             long timestamp;
>             if ( type.getTimestampExtractor() != null ) {
>                 if ( Date.class.isAssignableFrom( type.getTimestampExtractor().getExtractToClass() ) ) {
>                     timestamp = ((Date) type.getTimestampExtractor().getValue( workingMemory,
>                                                                                object )).getTime();
>                 } else {
>                     timestamp = type.getTimestampExtractor().getLongValue( workingMemory,
>                                                                            object );
>                 }
>             } else {
>                 timestamp = workingMemory.getTimerService().getCurrentTime();
> ....
> My code for storing / restoring session:
>         public void saveCorrelator(FileOutputStream output) throws IOException {
>                
>                 DroolsObjectOutputStream droolsOut = new DroolsObjectOutputStream(output);
>                 droolsOut.writeObject(ksession.getKnowledgeBase());
>                 Marshaller mas = createMarshaller(ksession.getKnowledgeBase());
>                 mas.marshall(droolsOut, ksession);
>                 droolsOut.flush();
>                 droolsOut.close();
>         }
>        
>         public void loadCorrelator(FileInputStream input) throws IOException,
>                         ClassNotFoundException {
>                
>                 DroolsObjectInputStream droolsIn = new DroolsObjectInputStream(input, this.getClass().getClassLoader());
>                 try {
>                         KnowledgeBase kbase = (KnowledgeBase) droolsIn.readObject();
>                         Marshaller mas = createMarshaller(kbase);
>                         ksession = mas.unmarshall(droolsIn);
>                 } catch(EOFException e) {
>                         log.error("EOFException on correlator restore");
>                 } finally {
>                         droolsIn.close();
>                 }
>                
>         }
>         private Marshaller createMarshaller(KnowledgeBase kbase) {
>                 ObjectMarshallingStrategyAcceptor acceptor = MarshallerFactory
>                                 .newClassFilterAcceptor(new String[] { "*.*" });
>                 ObjectMarshallingStrategy strategy = MarshallerFactory
>                                 .newSerializeMarshallingStrategy(acceptor);
>                 return MarshallerFactory.newMarshaller(kbase,
>                                 new ObjectMarshallingStrategy[] { strategy });
>         }

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