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).

It looks similar to JBRULES-2293, but I'm loading knowledge from Guvnor

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