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https://issues.apache.org/jira/browse/KARAF-4690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15503843#comment-15503843
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Frédérik ROULEAU commented on KARAF-4690:
-----------------------------------------

This is caused by jansi upgrade implied by jline upgrade.
jansi tries to unjar a dynamic library into tmp dir. If the directory does not 
exist, init fails.
Moving the tmp dir to system's tmp may also lead to problem as on common 
production system, that directory is mounted with noexec flag, preventing also 
jansi to load its native library.

> Karaf client fails to load if not able to write to $KARAF_DATA/tmp
> ------------------------------------------------------------------
>
>                 Key: KARAF-4690
>                 URL: https://issues.apache.org/jira/browse/KARAF-4690
>             Project: Karaf
>          Issue Type: Bug
>          Components: karaf-core
>    Affects Versions: 4.0.6
>         Environment: Linux
>            Reporter: Adrian Baker
>
> Running the Karaf client seems to result in an attempted write to the 
> $KARAF_DATA/tmp directory (see 
> https://github.com/fusesource/hawtjni/issues/27). If this fails, the client 
> won't load.
> {code}
> [vagrant@localhost data]$ /opt/karaf/bin/client
> Logging in as karaf
> 391 [sshd-SshClient[4445629]-nio2-thread-2] WARN 
> org.apache.sshd.client.keyverifier.AcceptAllServerKeyVerifier - Server at 
> /0.0.0.0:8101 presented unverified RSA key: 
> 49:03:6e:ad:91:7d:c2:11:cb:86:84:73:b2:9e:e9:4b
> Could not load library. Reasons: [no jansi in java.library.path, Permission 
> denied]
> {code}
> This write will fail if the user running the client script doesn't have write 
> permission to this directory, which occurs if you've installed karaf as one 
> user, then use another user to invoke the client script.
> I wonder if the standard default tmp directory is more appropriate for the 
> client process.
> This appears to be a change from 4.0.4 -> 4.0.6.



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