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https://issues.apache.org/jira/browse/NIFI-15686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mathias Krueger updated NIFI-15686:
-----------------------------------
    Description: 
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.

  was:
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 in line 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.


> 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
>            Priority: Major
>
> 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.



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