Attila Sasvari created KAFKA-7813:
-------------------------------------
Summary: 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
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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