I can confirm this issue. And can add to it that disappear jobs, that was added by copying from another job

Hi guys,

I can see the issue in the new version too 1.521

any logs?

some log on 1.522:

Jul 8, 2013 9:26:36 AM jenkins.InitReactorRunner$1 onTaskFailed
SEVERE: Failed Loading job web_acr.mlsdev.com_deploy_to_test
hudson.util.IOException2: Unable to read /var/lib/jenkins/jobs/web_acr.mlsdev.com_deploy_to_test/config.xml
at hudson.XmlFile.read(XmlFile.java:147)
at hudson.model.Items.load(Items.java:220)
at jenkins.model.Jenkins$18.run(Jenkins.java:2553)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:895)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)
Caused by: com.thoughtworks.xstream.converters.ConversionException: null : null
---- Debugging information ----
cause-exception : java.lang.NullPointerException
cause-message : null
class : org.jruby.runtime.builtin.IRubyObject
required-type : org.jruby.runtime.builtin.IRubyObject
converter-type : org.jenkinsci.jruby.JRubyXStreamConverter
path : /project/buildWrappers/ruby-proxy-object/ruby-object
line number : 124
class[1] : org.jenkinsci.jruby.JRubyMapper$DynamicProxy
converter-type[1] : org.jenkinsci.jruby.JavaProxyConverter
class[2] : hudson.util.DescribableList
converter-type[2] : hudson.util.DescribableList$ConverterImpl
class[3] : hudson.model.FreeStyleProject
converter-type[3] : hudson.util.RobustReflectionConverter
version : null
-------------------------------
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at org.jenkinsci.jruby.JavaProxyConverter.unmarshal(JavaProxyConverter.java:60)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:71)
at hudson.util.CopyOnWriteList$ConverterImpl.unmarshal(CopyOnWriteList.java:193)
at hudson.util.DescribableList$ConverterImpl.unmarshal(DescribableList.java:263)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at hudson.util.RobustReflectionConverter.unmarshalField(RobustReflectionConverter.java:333)
at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:275)
at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:222)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1061)
at hudson.util.XStream2.unmarshal(XStream2.java:109)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1045)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:925)
at hudson.XmlFile.read(XmlFile.java:143)
... 10 more
Caused by: java.lang.NullPointerException
at ruby.RubyPluginRuntimeResolver.unmarshal(RubyPluginRuntimeResolver.java:25)
at org.jenkinsci.jruby.JRubyXStreamConverter.unmarshal(JRubyXStreamConverter.java:82)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
... 38 more

looks like JENKINS-18525

thanks a lot) After upgrading ruby-runtime-plugin and upgrading Jenkins to 1.522 all jobs present

I can confirm the same, all jobs are present with new ruby-runtime in 1.522 , upgraded couple of minutes ago.

Thanks!

There were same problems had have been reported as JENKINS-18314 and JENKINS-18528. They have been fixed in ruby-runtime 0.12.