I tried to fix it by adding a check (see code snippet) which resolved the NPE
below but caused a new one – I guess it needs more than that …
Code snippet:
…
if (scalingDependencies != null && !scalingDependencies.isEmpty()) {
for (ScalingDependentList scalingDependentList :
scalingDependencies) {
ScalingEvent highestFactorEvent = null;
for (String scalingDependentListComponent :
scalingDependentList.
…
New NPE (with fix from code snippet):
TID: [0] [STRATOS] [2014-12-18 21:56:50,452] ERROR
{org.apache.stratos.messaging.message.receiver.topology.TopologyEventMessageDelegator}
- Failed to retrieve topology event message
{org.apache.stratos.messaging.message.receiver.topology.TopologyEventMessageDelegator}
java.lang.NullPointerException
at
org.apache.stratos.autoscaler.pojo.policy.deployment.DeploymentPolicy.getChildPolicy(DeploymentPolicy.java:213)
at
org.apache.stratos.autoscaler.context.cluster.VMClusterContext.addInstanceContext(VMClusterContext.java:129)
at
org.apache.stratos.autoscaler.event.receiver.topology.AutoscalerTopologyEventReceiver$14.onEvent(AutoscalerTopologyEventReceiver.java:459)
at
org.apache.stratos.messaging.listener.EventListener.update(EventListener.java:42)
From: Imesh Gunaratne [mailto:im...@apache.org]
Sent: Thursday, December 18, 2014 11:48 AM
To: dev
Subject: NPE in ParentComponentMonitor
Hi Devs,
I'm seeing the below NPE in ParentComponentMonitor:
[2014-12-19 01:15:25,836] INFO
{org.apache.stratos.autoscaler.applications.topic.ApplicationsEventPublisher} -
Publishing Application Active event for [application]: single-group-app
[instance]:single-group-app-1
[2014-12-19 01:15:25,866] INFO
{org.apache.stratos.autoscaler.applications.topic.ApplicationsEventPublisher} -
Publishing Group activated event for [application]: single-group-app [group]:
single-group-app-group-1 [instance]:single-group-app-1
[2014-12-19 01:16:04,117] ERROR
{org.apache.stratos.autoscaler.monitor.component.ApplicationMonitor} -
Application monitor failed :
org.apache.stratos.autoscaler.monitor.component.ApplicationMonitor@21d2042d<mailto:org.apache.stratos.autoscaler.monitor.component.ApplicationMonitor@21d2042d>
java.lang.NullPointerException
at
org.apache.stratos.autoscaler.monitor.component.ParentComponentMonitor.handleDependentScaling(ParentComponentMonitor.java:573)
at
org.apache.stratos.autoscaler.monitor.component.ApplicationMonitor$1.run(ApplicationMonitor.java:117)
at
org.apache.stratos.autoscaler.monitor.component.ApplicationMonitor.monitor(ApplicationMonitor.java:125)
at
org.apache.stratos.autoscaler.monitor.component.ApplicationMonitor.run(ApplicationMonitor.java:74)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Thanks
--
Imesh Gunaratne
Technical Lead, WSO2
Committer & PMC Member, Apache Stratos
