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    Bug 
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    Resolution: Duplicate
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    Critical 
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    None
After upgrading to Jenkins 1.518 (from 1.517) last night, the ruby-runtime plugin disappeared from the list of installed plugins. Attempting to reinstall the plugin fails, and results in a stack trace ending with:
Caused by: org.jruby.embed.EvalFailedException: java.lang.IncompatibleClassChangeError: Found class com.kenai.jffi.InvocationBuffer, but interface was expected
A little googling suggests that this is a backwards incompatibility between jruby and more recent versions jffi.
- duplicates
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                    JENKINS-18311 Jenkins 1.518 fails to load plugin ruby-runtime -         
- Closed
 
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- is duplicated by
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                    JENKINS-18404 When I upgrade from Jenkins 1.517 most of my jobs are not visible in the Dashboard -         
- Closed
 
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- is related to
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                    JENKINS-18310 ruby-runtime throws java.lang.IncompatibleClassChangeError on start up -         
- Closed
 
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