Created attachment 798399 [details]
Maven project demonstrating the issue

Description of problem:
Environment: Drools 6.0.0.CR3

When using a KieScanner along with fireUntilHalt, we get an exception in thread when we change the version of the JAR file in the Maven rule repository.  
This exception is raised when 1 DRL file is removed from the new JAR in comparison with the previous version of that JAR. The problem doesn’t occur when a rule is removed from an existing .drl.
If we modify the Maven rule repository manually (typically by tampering the maven-metadata-local.xml file), the scanner triggers as expected and we also get the same exception as we were doing the deployment by Java code.

Version-Release number of selected component (if applicable):


How reproducible:
Refer to attached JUnit test.

Steps to Reproduce:
1. Run the JUnit test.
2.
3.

Actual results:


Expected results:


Additional info:
Exception in thread "Timer-0" java.lang.NullPointerException
	at org.drools.core.util.IoUtils.readBytesFromInputStream(IoUtils.java:167)
	at org.drools.core.util.IoUtils.readBytesFromZipEntry(IoUtils.java:185)
	at org.drools.compiler.kie.builder.impl.ZipKieModule.getBytes(ZipKieModule.java:40)
	at org.drools.compiler.kie.builder.impl.AbstractKieModule.getResource(AbstractKieModule.java:273)
	at org.drools.compiler.kie.builder.impl.KieContainerImpl.updateToVersion(KieContainerImpl.java:112)
	at org.kie.scanner.KieRepositoryScannerImpl.updateKieModule(KieRepositoryScannerImpl.java:203)
	at org.kie.scanner.KieRepositoryScannerImpl.scanNow(KieRepositoryScannerImpl.java:193)
	at org.kie.scanner.KieRepositoryScannerImpl$ScanTask.run(KieRepositoryScannerImpl.java:180)
	at java.util.TimerThread.mainLoop(Timer.java:555)
	at java.util.TimerThread.run(Timer.java:505)