Description of problem:
The agent log contains the following warning repeatedly:

WARN  [Content.discovery-1] (rhq.core.pc.inventory.InventoryManager)- Cannot get a resource container for an invalid resource ID=0


Version-Release number of selected component (if applicable):
3.1.0

How reproducible:
Always

Steps to Reproduce:
1. Install JON 3.1.0
2. Register agent with server (DO NOT import platform into inventory)
  
Actual results:
Each time discovery is attempted, the warning is logged.

2012-09-12 16:51:01,075 DEBUG [Content.discovery-1] (rhq.core.pc.content.ContentDiscoveryRunner)- Performing discovery: ScheduledContentDiscoveryInfo:resource-id=[0], package-type=[rpm], interval=[43200000], next-discovery=[Wed Sep 12 16:50:01 CDT 2012
2012-09-12 16:51:01,077 WARN  [Content.discovery-1] (rhq.core.pc.inventory.InventoryManager)- Cannot get a resource container for an invalid resource ID=0
2012-09-12 16:51:01,077 DEBUG [Content.discovery-1] (rhq.core.pc.inventory.InventoryManager)- Stack trace follows:
java.lang.Throwable: This is where resource ID=[0] was passed in
	at org.rhq.core.pc.inventory.InventoryManager.getResourceContainer(InventoryManager.java:490)
	at org.rhq.core.pc.util.ComponentUtil.getComponent(ComponentUtil.java:100)
	at org.rhq.core.pc.content.ContentManager.performContentDiscovery(ContentManager.java:420)
	at org.rhq.core.pc.content.ContentDiscoveryRunner.call(ContentDiscoveryRunner.java:123)
	at org.rhq.core.pc.content.ContentDiscoveryRunner.run(ContentDiscoveryRunner.java:90)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:636)
2012-09-12 16:51:01,078 WARN  [Content.discovery-1] (rhq.core.pc.content.ContentDiscoveryRunner)- Exception received from component while attempting content retrieval
org.rhq.core.clientapi.agent.PluginContainerException: Resource component container could not be retrieved for resource: 0
	at org.rhq.core.pc.util.ComponentUtil.getComponent(ComponentUtil.java:102)
	at org.rhq.core.pc.content.ContentManager.performContentDiscovery(ContentManager.java:420)
	at org.rhq.core.pc.content.ContentDiscoveryRunner.call(ContentDiscoveryRunner.java:123)
	at org.rhq.core.pc.content.ContentDiscoveryRunner.run(ContentDiscoveryRunner.java:90)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:636)
2012-09-12 16:51:01,079 WARN  [Content.discovery-1] (rhq.core.pc.inventory.InventoryManager)- Cannot get a resource container for an invalid resource ID=0
2012-09-12 16:51:01,079 DEBUG [Content.discovery-1] (rhq.core.pc.inventory.InventoryManager)- Stack trace follows:
java.lang.Throwable: This is where resource ID=[0] was passed in
	at org.rhq.core.pc.inventory.InventoryManager.getResourceContainer(InventoryManager.java:490)
	at org.rhq.core.pc.content.ContentManager.rescheduleDiscovery(ContentManager.java:360)
	at org.rhq.core.pc.content.ContentDiscoveryRunner.call(ContentDiscoveryRunner.java:130)
	at org.rhq.core.pc.content.ContentDiscoveryRunner.run(ContentDiscoveryRunner.java:90)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:636)


Expected results:
No warning and no stack trace in DEBUG.

Additional info:
Although this does not seem to impact inventory or inventory synchronization, it is a warning and gives the appearance that something is broken. Of course, this is not the case. Instead, all this simply means is that the agent platform has not yet been imported into inventory and still has a resource ID of 0. Perhaps we should be checking the inventory status for resources containers with ID of 0 and in such cases suppress the warning?