Unable to start ssh slave , Getting java.lang.NullPointerException in hudson.Util.copyStream(Util.java:437)

[Prafulla T]

Hi All,

I am getting following error while starting ssh slave.
Any help on how to solve this ?

.
hudson.util.IOException2: Could not copy slave.jar to slave
	at hudson.plugins.sshslaves.SSHLauncher.copySlaveJar(SSHLauncher.java:530)
	at hudson.plugins.sshslaves.SSHLauncher.launch(SSHLauncher.java:291)
	at hudson.slaves.SlaveComputer$1.call(SlaveComputer.java:200)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
Caused by: hudson.util.IOException2: Could not copy slave.jar to '/data/c2sw/jenkins/slave.jar' on slave
	at hudson.plugins.sshslaves.SSHLauncher.copySlaveJar(SSHLauncher.java:527)
	... 7 more
Caused by: java.lang.NullPointerException
	at hudson.Util.copyStream(Util.java:437)
	at hudson.Util.copyStreamAndClose(Util.java:450)
	at hudson.plugins.sshslaves.SSHLauncher.copySlaveJar(SSHLauncher.java:522)
	... 7 more
[08/19/12 00:54:21] [SSH] Connection closed.

[Prafulla T]

It automatically got fixed when I disabled ruby-runtime plugin.
Somebody needs to debug this dependency and fix this issue.

[Dante Pichardo]

I got the same error.  I copied slave.jar to this location /var/cache/jenkins/war/WEB-INF/
And it fixed the issue.