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https://issues.apache.org/jira/browse/AMQ-6899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16363813#comment-16363813
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Gary Tully commented on AMQ-6899:
---------------------------------

there is a test for this feature in karaf that may help reproduce or diagnose 
(by comparison):
see: 
https://git-wip-us.apache.org/repos/asf?p=activemq.git;a=blob;f=activemq-karaf-itest/src/test/java/org/apache/activemq/karaf/itest/ActiveMQBrokerRuntimeConfigTest.java;h=d34bf4ea3fdee7cfd33a1a9eba6c2f560ec45a69;hb=HEAD



> Runtime Configuration Plugin throwing NPE at startup
> ----------------------------------------------------
>
>                 Key: AMQ-6899
>                 URL: https://issues.apache.org/jira/browse/AMQ-6899
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: runtime configuration plugin
>    Affects Versions: 5.13.3
>         Environment: Karaf
> both Windows and Linux (CentOS 7)
>            Reporter: Peter Berkman
>            Priority: Minor
>
> NOTE: running in Karaf
>  
> Here is the plugin declaration from activemq.xml - note: have tried by with 
> and without the checkPeriod - both throw the same NPE:
> {code:java}
> <plugins>
>      <runtimeConfigurationPlugin />
>  </plugins>
> <plugins>
>     <runtimeConfigurationPlugin checkPeriod="2000" />
> </plugins>
> {code}
> The configuration seems to load fine, but this exception is thrown on every 
> startup.
>  
>  
> {code:java}
> 20180213 16:34:25.556 [INFO ] Broker Starting Thread | 
> 150:org.apache.activemq.activemq-osgi | 
> org.apache.activemq.plugin.AbstractRuntimeConfigurationBroker | Unexpected 
> exception during load of: URL 
> [file:/D:/Nextgate/products/ngs/etc/activemq.xml]
> java.lang.NullPointerException
>  at 
> org.apache.activemq.plugin.RuntimeConfigurationBroker.getSchema(RuntimeConfigurationBroker.java:232)[150:org.apache.activemq.activemq-osgi:5.13.3]
>  at 
> org.apache.activemq.plugin.RuntimeConfigurationBroker.loadConfiguration(RuntimeConfigurationBroker.java:178)[150:org.apache.activemq.activemq-osgi:5.13.3]
>  at 
> org.apache.activemq.plugin.RuntimeConfigurationBroker.start(RuntimeConfigurationBroker.java:82)[150:org.apache.activemq.activemq-osgi:5.13.3]
>  at 
> org.apache.activemq.broker.BrokerService$6.start(BrokerService.java:2324)[150:org.apache.activemq.activemq-osgi:5.13.3]
>  at 
> org.apache.activemq.broker.BrokerService.doStartBroker(BrokerService.java:732)[150:org.apache.activemq.activemq-osgi:5.13.3]
>  at 
> org.apache.activemq.broker.BrokerService.access$300(BrokerService.java:139)[150:org.apache.activemq.activemq-osgi:5.13.3]
>  at 
> org.apache.activemq.broker.BrokerService$3.run(BrokerService.java:711)[150:org.apache.activemq.activemq-osgi:5.13.3]
> 20180213 16:34:25.568 [INFO ] Broker Starting Thread | 
> 150:org.apache.activemq.activemq-osgi | 
> org.apache.activemq.transport.TransportServerThreadSupport | Listening for 
> connections at: 
> tcp://127.0.0.1:8206?transport.threadName&transport.maximumConnections=1000&wireFormat.maxFrameSize=104857600
>  
> {code}
>  



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