Jackie-Jiang commented on pull request #5888:
URL: https://github.com/apache/incubator-pinot/pull/5888#issuecomment-675664230
Here is the stacktrace of the exception
```
Failed to start a [ CONTROLLER ] Service
java.lang.NullPointerException: null
at java.util.ArrayDeque.addLast(ArrayDeque.java:304) ~[?:?]
at java.util.ArrayDeque.add(ArrayDeque.java:495) ~[?:?]
at jdk.internal.loader.URLClassPath.<init>(URLClassPath.java:154) ~[?:?]
at jdk.internal.loader.URLClassPath.<init>(URLClassPath.java:171) ~[?:?]
at java.net.URLClassLoader.<init>(URLClassLoader.java:165) ~[?:?]
at
org.apache.pinot.controller.api.ControllerAdminApiApplication.setupSwagger(ControllerAdminApiApplication.java:160)
~[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.controller.api.ControllerAdminApiApplication.start(ControllerAdminApiApplication.java:125)
~[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.controller.ControllerStarter.setUpPinotController(ControllerStarter.java:416)
~[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.controller.ControllerStarter.start(ControllerStarter.java:287)
~[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.tools.service.PinotServiceManager.startController(PinotServiceManager.java:113)
~[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.tools.service.PinotServiceManager.startRole(PinotServiceManager.java:90)
~[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.tools.admin.command.StartServiceManagerCommand.startPinotService(StartServiceManagerCommand.java:200)
[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.tools.admin.command.StartServiceManagerCommand.startPinotService(StartServiceManagerCommand.java:195)
[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.tools.admin.command.StartServiceManagerCommand.execute(StartServiceManagerCommand.java:166)
[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.tools.admin.command.StartControllerCommand.execute(StartControllerCommand.java:130)
[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.tools.admin.command.QuickstartRunner.startControllers(QuickstartRunner.java:105)
[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at
org.apache.pinot.tools.admin.command.QuickstartRunner.startAll(QuickstartRunner.java:140)
[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at org.apache.pinot.tools.Quickstart.execute(Quickstart.java:167)
[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
at org.apache.pinot.tools.Quickstart.main(Quickstart.java:222)
[pinot-all-0.5.0-SNAPSHOT-jar-with-dependencies.jar:0.5.0-SNAPSHOT-31137f31c282c11ce70c935ffc6557dc76ec2f0e]
```
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