The following confusing line can be found in business-central:

16:41:51,113 WARN [org.drools.compiler.kie.builder.impl.AbstractKieModule] (MSC service thread 1-3) Compilation cache has been built with an incompatible version, so don't use it

Including preceding lines:

16:41:52,622 INFO [org.drools.compiler.kie.builder.impl.KieRepositoryImpl] (MSC service thread 1-3) KieModule was added:ZipKieModule[ ReleaseId=com.bpms.flood:bpms-perf:1.0.0.Finalfile=/home/jsvitak/.m2/repository/com/bpms/flood/bpms-perf/1.0.0.Final/bpms-perf-1.0.0.Final.jar]
16:41:53,254 INFO [org.jbpm.kie.services.impl.store.DeploymentSynchronizer] (MSC service thread 1-3) Deployment unit com.bpms.flood:bpms-perf:1.0.0.Final [strategy=SINGLETON] stored successfully
16:41:51,113 WARN [org.drools.compiler.kie.builder.impl.AbstractKieModule] (MSC service thread 1-3) Compilation cache has been built with an incompatible version, so don't use it

This statement is strange. Either there is no problem and this should not be logged or there is a problem, which needs to be fixed or user should be told what he should do with it. If the warning is related to log lines above it should be mentioned and a suggestion for rebuild of the project could be added.

My env:
BPMS 6.1.0.DR2
EAP 6.3.0