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https://issues.apache.org/jira/browse/ARTEMIS-5664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18032546#comment-18032546
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Justin Bertram commented on ARTEMIS-5664:
-----------------------------------------
You're getting a {{NullPointerException}} here because you're use of the API is
invalid and contra the explicit documentation. Unlike the example you linked,
your code [creates an *anonymous*
producer|https://activemq.apache.org/components/artemis/documentation/javadocs/javadoc-latest/org/apache/activemq/artemis/api/core/client/ClientSession.html#createProducer()].
The corresponding JavaDoc says this:
bq. Address must be specified every time a message is sent
However, when you send the message you _do not_ specify the address (e.g. using
[this
method|https://activemq.apache.org/components/artemis/documentation/javadocs/javadoc-latest/org/apache/activemq/artemis/api/core/client/ClientProducer.html#send(org.apache.activemq.artemis.api.core.SimpleString,org.apache.activemq.artemis.api.core.Message)]).
The API could handle this better (e.g by throwing a different exception with a
clearer message), but the real problem here is the client code. Feel free to
open a new Jira about the exception that's thrown in this particular invalid
use-case.
> NullPointerException when using Core
> -------------------------------------
>
> Key: ARTEMIS-5664
> URL: https://issues.apache.org/jira/browse/ARTEMIS-5664
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Affects Versions: 2.31.2, 2.43.0
> Environment: openjdk version "21.0.8" 2025-07-15
> Reporter: Mikhail Titov
> Priority: Major
> Attachments: NullPointerException_Embedded_Core.tar
>
>
> I have found a NullPointerException bug as a result of fuzz-testing core
> protocol (using embedded broker) based on [[described
> example|https://activemq.apache.org/components/artemis/documentation/2.31.2/core.html#a-simple-example-of-using-core|#a-simple-example-of-using-core]]]
> I have created a standalone repro for this bug (attached archive). You can
> reproduce it by running the following command:
> {code:java}
> java -cp .:jars/* NullPointerBug.java {code}
> If you want to reproduce the bug more than once, you should delete the "data"
> folder created as a result of the launch.
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