kie-server Marshaller retains the old version classes so they are used on the REST call. It will result in "rule is not fired" in the below scenario:

• Create KieConatiner in kie-server with 1.0-SNAPSHOT version and enable KieScanner
• [Build&Deploy] in business-central
• Access kie-server -> works correctly
• mvn deploy via command line (e.g. mvn clean install deploy -DaltDeploymentRepository=guvnor-m2-repo::default::http://localhost:8080/business-central/maven2/)
• Access kie-server -> rule is not fired because of different versions of the same Fact class

Marshaller is disposed on KieContainerInstanceImpl.updateReleaseId() but not on KieScanner update.

https://github.com/kiegroup/droolsjbpm-integration/blob/master/kie-server-parent/kie-server-services/kie-server-services-common/src/main/java/org/kie/server/services/impl/KieContainerInstanceImpl.java#L232-L246

Doesn't the comment in the method explain this problem?
~~~
// marshallers need to disposed in case the container was updated with different releaseId
// proper solution is to attach listener directly to the KieScanner and dispose the marshallers,
// but those listeners are not (yet) available, so this is a temporary hackish "solution"
~~~

But KieScannerEventListener is now available since RHDM 7.0 and BRMS 6.4.4.

https://issues.jboss.org/browse/DROOLS-1565