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https://issues.apache.org/jira/browse/NIFI-15686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18065680#comment-18065680
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ASF subversion and git services commented on NIFI-15686:
--------------------------------------------------------

Commit 70a1b33896522d362d344b0a92ae3627e2e9f380 in nifi's branch 
refs/heads/main from Pierre Villard
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=70a1b338965 ]

NIFI-15686 Fixed NullPointerException in ListenSyslog.getListenPorts (#11003)

Signed-off-by: David Handermann <[email protected]>

> NullPointerException when accessing /nifi-api/flow/listen-ports
> ---------------------------------------------------------------
>
>                 Key: NIFI-15686
>                 URL: https://issues.apache.org/jira/browse/NIFI-15686
>             Project: Apache NiFi
>          Issue Type: Bug
>    Affects Versions: 2.8.0
>            Reporter: Mathias Krueger
>            Assignee: Pierre Villard
>            Priority: Major
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> If a user adds a ListenSyslog processor to the canvas and doesnt configure a 
> port, accessing nifi-api/flow/listen-ports results in the message:
> An unexpected error has occurred. Please check the logs for additional 
> details.
> in nifi-user.log the following NPE is thrown
> {code:java}
> java.lang.NullPointerException: Cannot invoke "java.lang.Integer.intValue()" 
> because "tcpPortNumber" is null
>         at 
> org.apache.nifi.processors.standard.ListenSyslog.getListenPorts(ListenSyslog.java:357)
> {code}
> In ListenSyslog in method getListenPorts should a null value check for TCP 
> and UDP port be added.
> Also if the users enters an invalid value (e.g. empty text) this method 
> should not fail.
> This problem exists for every components that inherits the method 
> getListenPorts() form the interface ListenComponent



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