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https://issues.apache.org/jira/browse/KAFKA-7813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16794646#comment-16794646
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ASF GitHub Bot commented on KAFKA-7813:
---------------------------------------
ewencp commented on pull request #6139: KAFKA-7813: JmxTool throws NPE when
--object-name is omitted
URL: https://github.com/apache/kafka/pull/6139
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> JmxTool throws NPE when --object-name is omitted
> ------------------------------------------------
>
> Key: KAFKA-7813
> URL: https://issues.apache.org/jira/browse/KAFKA-7813
> Project: Kafka
> Issue Type: Bug
> Reporter: Attila Sasvari
> Assignee: huxihx
> Priority: Minor
> Fix For: 2.3.0
>
>
> Running the JMX tool without --object-name parameter, results in a
> NullPointerException:
> {code}
> $ bin/kafka-run-class.sh kafka.tools.JmxTool --jmx-url
> service:jmx:rmi:///jndi/rmi://127.0.0.1:9999/jmxrmi
> ...
> Exception in thread "main" java.lang.NullPointerException
> at kafka.tools.JmxTool$$anonfun$3.apply(JmxTool.scala:143)
> at kafka.tools.JmxTool$$anonfun$3.apply(JmxTool.scala:143)
> at
> scala.collection.LinearSeqOptimized$class.exists(LinearSeqOptimized.scala:93)
> at scala.collection.immutable.List.exists(List.scala:84)
> at kafka.tools.JmxTool$.main(JmxTool.scala:143)
> at kafka.tools.JmxTool.main(JmxTool.scala)
> {code}
> Documentation of the tool says:
> {code}
> --object-name <String: name> A JMX object name to use as a query.
>
> This can contain wild cards, and
>
> this option can be given multiple
>
> times to specify more than one
>
> query. If no objects are specified
>
> all objects will be queried.
> {code}
> Running the tool with {{--object-name ''}}, also results in an NPE:
> {code}
> $ bin/kafka-run-class.sh kafka.tools.JmxTool --jmx-url
> service:jmx:rmi:///jndi/rmi://127.0.0.1:9999/jmxrmi --object-name ''
> ...
> Exception in thread "main" java.lang.NullPointerException
> at kafka.tools.JmxTool$.main(JmxTool.scala:197)
> at kafka.tools.JmxTool.main(JmxTool.scala)
> {code}
> Runnig the tool with --object-name without an argument, the tool with
> OptionMissingRequiredArgumentException:
> {code}
> $ bin/kafka-run-class.sh kafka.tools.JmxTool --jmx-url
> service:jmx:rmi:///jndi/rmi://127.0.0.1:9999/jmxrmi --object-name
> Exception in thread "main" joptsimple.OptionMissingRequiredArgumentException:
> Option object-name requires an argument
> at
> joptsimple.RequiredArgumentOptionSpec.detectOptionArgument(RequiredArgumentOptionSpec.java:48)
> at
> joptsimple.ArgumentAcceptingOptionSpec.handleOption(ArgumentAcceptingOptionSpec.java:257)
> at joptsimple.OptionParser.handleLongOptionToken(OptionParser.java:513)
> at
> joptsimple.OptionParserState$2.handleArgument(OptionParserState.java:56)
> at joptsimple.OptionParser.parse(OptionParser.java:396)
> at kafka.tools.JmxTool$.main(JmxTool.scala:104)
> at kafka.tools.JmxTool.main(JmxTool.scala)
> {code}
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