compiled processes in PKG removed by knowledge agent after first change scan

[Jiang Zhu]

hi,

I'm having trouble with scanning changed knowledge from Guvnor. I found out that compiled processes from Guvnor are missing after resource change scanner scan for changes first time (event there is no changes).

I wrote a simple test to reproduce this. (tried with Drools 5.2.0.Final and Drools 5.3.0.CR1)

public class KnowledgeAgentTest {

        @Test
        public void should_load_processes() throws Exception {
                ResourceChangeScannerConfiguration sconf = ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration();
                // Scan change every 2 seconds
                KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("agent");
                // Changeset points to a PKG contains 12 processes on Guvnor
                kagent.applyChangeSet(ResourceFactory.newClassPathResource("test/drools-changeset.xml"));
                // Everything is still ok now
                System.out.println("Processes before scan: " + kagent.getKnowledgeBase().getProcesses().size());
                Assert.assertFalse(kagent.getKnowledgeBase().getProcesses().isEmpty());
                // Scan change every 2 seconds
                sconf.setProperty("drools.resource.scanner.interval", "2");
                ResourceFactory.getResourceChangeScannerService().configure(sconf);
                ResourceFactory.getResourceChangeScannerService().start();
                ResourceFactory.getResourceChangeNotifierService().start();
                // Wait long enough
                Thread.sleep(5000);
                // Processes are gone somehow
                System.out.println("Processes after scan: " + kagent.getKnowledgeBase().getProcesses().size());
                Assert.assertFalse(kagent.getKnowledgeBase().getProcesses().isEmpty());
        }

}

Here is what I'm getting when run the test.
-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running test.KnowledgeAgentTest
Processes before scan: 12
Processes after scan: 0
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 5.802 sec <<< FAILURE!

Results :

Failed tests:   should_load_processes(test.KnowledgeAgentTest)

Tests run: 1, Failures: 1, Errors: 0, Skipped: 0


Thanks,
Jiang