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  1. WildFly
  2. WFLY-5023

Intermittent NPE when removing data sources

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    • 10.0.0.Alpha6
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      It is easy to reproduce it if you create and delete many data sources at once.
      Attaching two CLI scripts, one for adding 300 datasources, one for removing all of them.
      Run bin/jboss-cli.sh -c --file=many-datasources.cli and then bin/jboss-cli.sh -c --file=remove-datasources.cli and watch the server log.

      For 300 data sources, I get about 4 to 6 NPEs.

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      It is easy to reproduce it if you create and delete many data sources at once. Attaching two CLI scripts, one for adding 300 datasources, one for removing all of them. Run bin/jboss-cli.sh -c --file=many-datasources.cli and then bin/jboss-cli.sh -c --file=remove-datasources.cli and watch the server log. For 300 data sources, I get about 4 to 6 NPEs.

      When removing a datasource, sporadically this exception appears in the log:

      12:49:58,224 WARN  [org.jboss.msc.service.fail] (MSC service thread 1-8) MSC000004: Failure during stop of service org.wildfly.data-source.ds51: java.lang.NullPointerException
	at org.jboss.as.connector.subsystems.datasources.AbstractDataSourceService.stop(AbstractDataSourceService.java:161)
	at org.jboss.msc.service.ServiceControllerImpl$StopTask.stopService(ServiceControllerImpl.java:2056)
	at org.jboss.msc.service.ServiceControllerImpl$StopTask.run(ServiceControllerImpl.java:2017)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

      This doesn't seem to happen on WildFly 9.x, only on recent master.
      I suspect that this could lead to some resource leaks, but didn't study it further.

      From git history, it looks like this might be caused by the fix for https://issues.jboss.org/browse/WFLY-4429

        1. many-datasources.cli
          32 kB
        2. remove-datasources.cli
          10 kB

              smaestri@redhat.com Stefano Maestri
              jmartisk@redhat.com Jan Martiska
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