Symptom:
Sessions unable to generate due to an error loading USuMInactiveService class.

The exact traceback found in both the engine and qns logs is:

10.192.131.36 2014-01-23 16:09:11,204 [broadhop-rules-12] ERROR c.b.s.i.a.GetSubscriberActionImpl - Unknown error getting class USuMInactiveService
java.lang.ClassNotFoundException: com.broadhop.session.domain.USuMInactiveService
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[na:1.7.0_13]
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[na:1.7.0_13]
        at java.security.AccessController.doPrivileged(Native Method) ~[na:1.7.0_13]
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[na:1.7.0_13]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:423) ~[na:1.7.0_13]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:356) ~[na:1.7.0_13]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.newInstancePolicyClass(GetSubscriberActionImpl.java:740) [com.broadhop.spr.service_2.0.3.release.jar:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.addSubscriberService(GetSubscriberActionImpl.java:410) [com.broadhop.spr.service_2.0.3.release.jar:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.buildSubscriber(GetSubscriberActionImpl.java:254) [com.broadhop.spr.service_2.0.3.release.jar:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.buildObjects(GetSubscriberActionImpl.java:220) [com.broadhop.spr.service_2.0.3.release.jar:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.execute(GetSubscriberActionImpl.java:142) [com.broadhop.spr.service_2.0.3.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.processSyncAction(RulesPolicyService.java:784) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.processAction(RulesPolicyService.java:1409) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.utilities.policy.autowire.NetworkDeviceManager.executeAction(NetworkDeviceManager.java:93) [com.broadhop.utility_5.5.1.release.jar:na]
        at com.broadhop.policy.authdomain.impl.DomainDeviceManager.usumAuthorization(DomainDeviceManager.java:728) [com.broadhop.policy.authdomain_5.5.1.release.jar:na]
        at com.broadhop.policy.authdomain.impl.DomainDeviceManager.getAuthoizationResult(DomainDeviceManager.java:649) [com.broadhop.policy.authdomain_5.5.1.release.jar:na]
        at com.broadhop.blueprint.master.MasterBlueprint.authorizeDomain(MasterBlueprint.java:565) [com.broadhop.master.autowire_5.5.1.release.jar:na]
        at com.broadhop.blueprint.master.MasterBlueprint.activeSessionPhase2(MasterBlueprint.java:373) [com.broadhop.master.autowire_5.5.1.release.jar:na]
        at com.broadhop.policy.Rule_Active_Session_Phase_2__52ab379b_768d_49d7_b2ab_3e979af3411a__nkC9ASLqEeG554DO93qTDg__0.consequence(Unknown Source) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:n
a]
        at com.broadhop.policy.Rule_Active_Session_Phase_2__52ab379b_768d_49d7_b2ab_3e979af3411a__nkC9ASLqEeG554DO93qTDg__0ConsequenceInvoker.evaluate(Unknown Source) [com.broadhop.3p.drools_4.0.7.b
roadhop_1.jar:na]
        at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:518) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:475) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:439) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.internalProcessRules(RulesPolicyService.java:564) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.process(RulesPolicyService.java:267) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService$PolicyExecutionRunnable.run(RulesPolicyService.java:1164) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [na:1.7.0_13]
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) [na:1.7.0_13]
        at java.util.concurrent.FutureTask.run(FutureTask.java:166) [na:1.7.0_13]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_13]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_13]
        at java.lang.Thread.run(Thread.java:722) [na:1.7.0_13]

10.192.131.36 2014-01-23 16:09:11,206 [broadhop-rules-12] ERROR c.b.policy.impl.RulesPolicyService - An error occured while processing a Sync Policy Action.
com.broadhop.exception.BroadhopException: Unknown error getting class USuMInactiveService
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.newInstancePolicyClass(GetSubscriberActionImpl.java:748) ~[na:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.addSubscriberService(GetSubscriberActionImpl.java:410) ~[na:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.buildSubscriber(GetSubscriberActionImpl.java:254) ~[na:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.buildObjects(GetSubscriberActionImpl.java:220) ~[na:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.execute(GetSubscriberActionImpl.java:142) ~[na:na]
        at com.broadhop.policy.impl.RulesPolicyService.processSyncAction(RulesPolicyService.java:784) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.processAction(RulesPolicyService.java:1409) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.utilities.policy.autowire.NetworkDeviceManager.executeAction(NetworkDeviceManager.java:93) [com.broadhop.utility_5.5.1.release.jar:na]
        at com.broadhop.policy.authdomain.impl.DomainDeviceManager.usumAuthorization(DomainDeviceManager.java:728) [com.broadhop.policy.authdomain_5.5.1.release.jar:na]
        at com.broadhop.policy.authdomain.impl.DomainDeviceManager.getAuthoizationResult(DomainDeviceManager.java:649) [com.broadhop.policy.authdomain_5.5.1.release.jar:na]
        at com.broadhop.blueprint.master.MasterBlueprint.authorizeDomain(MasterBlueprint.java:565) [com.broadhop.master.autowire_5.5.1.release.jar:na]
        at com.broadhop.blueprint.master.MasterBlueprint.activeSessionPhase2(MasterBlueprint.java:373) [com.broadhop.master.autowire_5.5.1.release.jar:na]
        at com.broadhop.policy.Rule_Active_Session_Phase_2__52ab379b_768d_49d7_b2ab_3e979af3411a__nkC9ASLqEeG554DO93qTDg__0.consequence(Unknown Source) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at com.broadhop.policy.Rule_Active_Session_Phase_2__52ab379b_768d_49d7_b2ab_3e979af3411a__nkC9ASLqEeG554DO93qTDg__0ConsequenceInvoker.evaluate(Unknown Source) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:518) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:475) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:439) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.internalProcessRules(RulesPolicyService.java:564) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.process(RulesPolicyService.java:267) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService$PolicyExecutionRunnable.run(RulesPolicyService.java:1164) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [na:1.7.0_13]
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) [na:1.7.0_13]
        at java.util.concurrent.FutureTask.run(FutureTask.java:166) [na:1.7.0_13]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_13]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_13]
        at java.lang.Thread.run(Thread.java:722) [na:1.7.0_13] 10.192.131.36 2014-01-23 16:09:11,206 [broadhop-rules-12] ERROR c.b.policy.impl.RulesPolicyService - An error occured while processing a Sync Policy Action.
com.broadhop.exception.BroadhopException: Unknown error getting class USuMInactiveService
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.newInstancePolicyClass(GetSubscriberActionImpl.java:748) ~[na:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.addSubscriberService(GetSubscriberActionImpl.java:410) ~[na:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.buildSubscriber(GetSubscriberActionImpl.java:254) ~[na:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.buildObjects(GetSubscriberActionImpl.java:220) ~[na:na]
        at com.broadhop.spr.impl.actions.GetSubscriberActionImpl.execute(GetSubscriberActionImpl.java:142) ~[na:na]
        at com.broadhop.policy.impl.RulesPolicyService.processSyncAction(RulesPolicyService.java:784) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.processAction(RulesPolicyService.java:1409) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.utilities.policy.autowire.NetworkDeviceManager.executeAction(NetworkDeviceManager.java:93) [com.broadhop.utility_5.5.1.release.jar:na]
        at com.broadhop.policy.authdomain.impl.DomainDeviceManager.usumAuthorization(DomainDeviceManager.java:728) [com.broadhop.policy.authdomain_5.5.1.release.jar:na]
        at com.broadhop.policy.authdomain.impl.DomainDeviceManager.getAuthoizationResult(DomainDeviceManager.java:649) [com.broadhop.policy.authdomain_5.5.1.release.jar:na]
        at com.broadhop.blueprint.master.MasterBlueprint.authorizeDomain(MasterBlueprint.java:565) [com.broadhop.master.autowire_5.5.1.release.jar:na]
        at com.broadhop.blueprint.master.MasterBlueprint.activeSessionPhase2(MasterBlueprint.java:373) [com.broadhop.master.autowire_5.5.1.release.jar:na]
        at com.broadhop.policy.Rule_Active_Session_Phase_2__52ab379b_768d_49d7_b2ab_3e979af3411a__nkC9ASLqEeG554DO93qTDg__0.consequence(Unknown Source) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at com.broadhop.policy.Rule_Active_Session_Phase_2__52ab379b_768d_49d7_b2ab_3e979af3411a__nkC9ASLqEeG554DO93qTDg__0ConsequenceInvoker.evaluate(Unknown Source) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:518) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:475) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:439) [com.broadhop.3p.drools_4.0.7.broadhop_1.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.internalProcessRules(RulesPolicyService.java:564) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService.process(RulesPolicyService.java:267) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at com.broadhop.policy.impl.RulesPolicyService$PolicyExecutionRunnable.run(RulesPolicyService.java:1164) [com.broadhop.policy.service_5.5.1.release.jar:na]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [na:1.7.0_13]
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) [na:1.7.0_13]
        at java.util.concurrent.FutureTask.run(FutureTask.java:166) [na:1.7.0_13]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_13]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_13]
       at java.lang.Thread.run(Thread.java:722) [na:1.7.0_13]

Conditions:
None established.  However, given the semantics of the tmpwatch daily job we would take it that the system had been idle for the last 10 days.