NullPointerException when upgrading to ssh-slaves 1.18

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      Reproduction steps.

      1. Start Jenkins without installing any plugins
      2. Install an older ssh-slaves plugin (e.g. 1.14), this way there is no key verification strategy configuration. You'll need to also install ssh-credentials manually.
      3. Add an SSH-based agent.
      4. Upgrade to ssh-slaves 1.18 and restart the Jenkins instance.
      5. Note the following error in the agent log:
      ERROR: Unexpected error in launching a slave. This is probably a bug in Jenkins.
java.lang.NullPointerException
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:789)
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:785)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
[06/12/17 19:19:28] Launch failed - cleaning up connection
[06/12/17 19:19:28] [SSH] Connection closed.

      To make sure this was specific to 1.18, I tested the upgrade from 1.14 to 1.17 and did not see a NullPointerException.

            Assignee:
            Jesse Glick
            Reporter:
            R. Tyler Croy
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Resolved:
              Archived: