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https://issues.apache.org/jira/browse/BROOKLYN-117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15987855#comment-15987855
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Aled Sage commented on BROOKLYN-117:
------------------------------------
The NPE happens if {{entity.getAttribute(JMX_PORT)}} returns {{null}}. The
{{getBrooklynAccessibleAddress}} takes an {{int}}, hence getting the NPE.
Wild guess is that the requested jmx_port was not available (in use by another
process).
This code is now guarded to more gracefully handle if the JMX_PORT attribute is
null.
We haven't seen this in a very long time, so I'm going to assume that it's
fixed.
> NullPointerException in JmxSupport
> ----------------------------------
>
> Key: BROOKLYN-117
> URL: https://issues.apache.org/jira/browse/BROOKLYN-117
> Project: Brooklyn
> Issue Type: Bug
> Reporter: Sam Corbett
>
> I deployed this blueprint to a Clocker location running in Softlayer:
> {code}
> name: ActiveMQ
> location: my-docker-cloud
> services:
> - type: brooklyn.entity.messaging.activemq.ActiveMQBroker
> brooklyn.config:
> docker.dockerfile.url:
> https://s3-eu-west-1.amazonaws.com/brooklyn-docker/UsesJavaDockerfile
> - type: brooklyn.entity.messaging.activemq.ActiveMQBroker
> brooklyn.config:
> docker.dockerfile.url:
> https://s3-eu-west-1.amazonaws.com/brooklyn-docker/UsesJavaDockerfile
> {code}
> One of the ActiveMQ brokers failed to start because of a
> {{NullPointerException}} thrown from {{JmxSupport}}:
> {code}
> 2015-01-12 16:50:43,682 DEBUG b.u.task.BasicExecutionManager
> [brooklyn-execmanager-ZYItXzrw-262]: Exception running task
> Task[pre-install-command:GRPp1Omr] (rethrowing): null
> java.lang.NullPointerException: null
> at
> brooklyn.entity.java.JmxSupport.applyJmxJavaSystemProperties(JmxSupport.java:275)
> ~[brooklyn-software-base-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.entity.java.JavaSoftwareProcessSshDriver.getJmxJavaSystemProperties(JavaSoftwareProcessSshDriver.java:257)
> ~[brooklyn-software-base-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.entity.java.JavaSoftwareProcessSshDriver.getJavaSystemProperties(JavaSoftwareProcessSshDriver.java:206)
> ~[brooklyn-software-base-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.entity.java.JavaSoftwareProcessSshDriver.getJavaOpts(JavaSoftwareProcessSshDriver.java:124)
> ~[brooklyn-software-base-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.entity.java.JavaSoftwareProcessSshDriver.getShellEnvironment(JavaSoftwareProcessSshDriver.java:104)
> ~[brooklyn-software-base-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.entity.messaging.activemq.ActiveMQSshDriver.getShellEnvironment(ActiveMQSshDriver.java:139)
> ~[brooklyn-software-messaging-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.entity.basic.AbstractSoftwareProcessSshDriver.execute(AbstractSoftwareProcessSshDriver.java:301)
> ~[brooklyn-software-base-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.entity.basic.AbstractSoftwareProcessSshDriver.execute(AbstractSoftwareProcessSshDriver.java:284)
> ~[brooklyn-software-base-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.entity.basic.AbstractSoftwareProcessSshDriver.runPreInstallCommand(AbstractSoftwareProcessSshDriver.java:418)
> ~[brooklyn-software-base-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.entity.basic.AbstractSoftwareProcessDriver$2.run(AbstractSoftwareProcessDriver.java:106)
> ~[brooklyn-clocker-patches-0.8.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> ~[na:1.7.0_51]
> at
> brooklyn.util.task.DynamicSequentialTask$DstJob.call(DynamicSequentialTask.java:337)
> ~[brooklyn-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> brooklyn.util.task.BasicExecutionManager$SubmissionCallable.call(BasicExecutionManager.java:469)
> ~[brooklyn-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> [na:1.7.0_51]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> [na:1.7.0_51]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> [na:1.7.0_51]
> at java.lang.Thread.run(Thread.java:744) [na:1.7.0_51]
> {code}
> Line 275 of {{JmxSupport}} is:
> {code}
> HostAndPort jmx =
> BrooklynAccessUtils.getBrooklynAccessibleAddress(entity,
> entity.getAttribute(JMX_PORT));
> {code}
> The {{entity}} field should not be null in a sane world because it's
> protected by a {{checkNotNull}} in the class' constructor.
> Two subsequent deployments of the same blueprint were successful.
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