Apparently fixed in 1.451 - after an update all was well.

Fixed in 1.7

I get a similar error after upgrading Jenkins to latest 1.586, I think it is related to https://issues.jenkins-ci.org/browse/JENKINS-24521. Downgrading to 1.585 fixes the issue.

Here's the stack:

javax.servlet.ServletException: org.apache.commons.jelly.JellyTagException: jar:file:/var/lib/jenkins/plugins/libvirt-slave/WEB-INF/lib/libvirt-slave.jar!/hudson/plugins/libvirt/VirtualMachineSlave/configure-entries.jelly:9:124: Could not initialize class org.libvirt.Connect
at org.kohsuke.stapler.jelly.JellyFacet$1.dispatch(JellyFacet.java:103)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:391)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:211)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:648)
at org.kohsuke.stapler.Stapler.service(Stapler.java:237)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:86)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:949)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1011)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.commons.jelly.JellyTagException: jar:file:/var/lib/jenkins/plugins/libvirt-slave/WEB-INF/lib/libvirt-slave.jar!/hudson/plugins/libvirt/VirtualMachineSlave/configure-entries.jelly:9:124: Could not initialize class org.libvirt.Connect
at org.apache.commons.jelly.impl.TagScript.handleException(TagScript.java:745)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:289)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
at org.kohsuke.stapler.jelly.JellyViewScript.run(JellyViewScript.java:95)
at org.kohsuke.stapler.jelly.IncludeTag.doTag(IncludeTag.java:147)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.tags.core.CoreTagLibrary$1.run(CoreTagLibrary.java:98)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)
at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
at org.kohsuke.stapler.jelly.JellyViewScript.run(JellyViewScript.java:95)
at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:63)
at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:53)
at org.kohsuke.stapler.jelly.JellyFacet$1.dispatch(JellyFacet.java:95)
... 67 more
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.libvirt.Connect
at hudson.plugins.libvirt.lib.libvirt.LibVirtConnectImpl.(LibVirtConnectImpl.java:23)
at hudson.plugins.libvirt.lib.ConnectionBuilder.build(ConnectionBuilder.java:97)
at hudson.plugins.libvirt.Hypervisor.getOrCreateConnection(Hypervisor.java:137)
at hudson.plugins.libvirt.Hypervisor.getDomains(Hypervisor.java:214)
at hudson.plugins.libvirt.Hypervisor.getVirtualMachines(Hypervisor.java:262)
at hudson.plugins.libvirt.VirtualMachineSlave$DescriptorImpl.getDefinedVirtualMachines(VirtualMachineSlave.java:167)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.commons.jexl.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:258)
at org.apache.commons.jexl.parser.ASTMethod.execute(ASTMethod.java:104)
at org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:83)
at org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:57)
at org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:51)
at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:80)
at hudson.ExpressionFactory2$JexlExpression.evaluate(ExpressionFactory2.java:74)
at org.apache.commons.jelly.expression.ExpressionSupport.evaluateRecurse(ExpressionSupport.java:61)
at org.apache.commons.jelly.expression.ExpressionSupport.evaluateAsIterator(ExpressionSupport.java:94)
at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:89)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
... 122 more

same issue with jenkins 1.587 / libvirt-slave-plugin 1.8.4 on Debian Wheezy 7.7
$ java -version
java version "1.7.0_65"
OpenJDK Runtime Environment (IcedTea 2.5.1) (7u65-2.5.1-5~deb7u1)
OpenJDK Server VM (build 24.65-b04, mixed mode)

javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class org.libvirt.Connect
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:86)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.libvirt.Connect
at hudson.plugins.libvirt.lib.libvirt.LibVirtConnectImpl.<init>(LibVirtConnectImpl.java:23)
at hudson.plugins.libvirt.lib.ConnectionBuilder.build(ConnectionBuilder.java:97)
at hudson.plugins.libvirt.Hypervisor$DescriptorImpl.doTestConnection(Hypervisor.java:455)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:121)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
... 63 more

the dependency org.libvirt only works with JNA [3.4.1,4.0.0]
http://libvirt.org/java.html

The plugin should bundle its own JNA and usePluginFirstClassLoader. Core needed to use JNA 4 due to numerous bugs in 3.x.

I also have this problem. Is the only current work-around to downgrade Core?

AFAIK downgrade is the only solution atm

is anyone working on this issue?

I was able to just convert the slaves to SSH which works ok, but I lose the added functionality of the libvirt on/off changes.

What generally needs to be done to fix this? I don't mind having a go at the libvirt plugin, but I don't have a whole lot of experience at what exactly is wrong.

Hello,

Does this issue have another workaround that downgrade Jenkins or use SSH ?

If not, I could fork this plugin but I lack of information to upgrade it.
Can someone help me to realize this work ?

Thanks in advance.

Regards,

i tried to just bundle the old JNA as indicated by Daniel Beck. Alas I couldn't get it to work. it was still loading the new JNA or the plugin was failing to load completely.

i think the "best" solution would be to get the plugin itself use a more recent version of libvirt-java and get it to work with the jna used in jenkins, although not sure how much effort this is.

maybe tastybug could answer this

G. Kr. Do you have the sources for your change somewhere?

attached jenkins-12532-test.patch how i tried to package old jna for libvirt plugin

this does not work!

following errors occur:
WARNING: Failed to scout hudson.plugins.libvirt.VirtualMachineManagement
java.lang.LinkageError: loader constraint violation: when resolving method "org.slf4j.impl.StaticLoggerBinder.getLoggerFactory()Lorg/slf4j/ILoggerFactory;" the class loader (instance of hudson/PluginFirstClassLoader) of the current class, org/slf4j/LoggerFactory, and the class loader (instance of org/jenkinsci/maven/plugins/hpi/RunMojo$2) for resolved class, org/slf4j/impl/StaticLoggerBinder, have different Class objects for the type LoggerFactory; used in the signature
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:299)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:269)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)
at hudson.plugins.libvirt.VirtualMachineManagement.<clinit>(VirtualMachineManagement.java:26)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at hudson.ExtensionFinder$Sezpoz.scout(ExtensionFinder.java:677)
at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:337)

Jan 8, 2015 10:48:53 AM hudson.ExtensionFinder$GuiceFinder$FaultTolerantScope$1 error
WARNING: Failed to instantiate Key[type=hudson.plugins.libvirt.VirtualMachineManagement, annotation=[none]]; skipping this component
java.lang.NoClassDefFoundError: Could not initialize class hudson.plugins.libvirt.VirtualMachineManagement

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:534)
at com.google.inject.internal.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:86)
at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:108)
at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:88)
at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:269)
at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46)
at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1058)
at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
at com.google.inject.Scopes$1$1.get(Scopes.java:65)
at hudson.ExtensionFinder$GuiceFinder$FaultTolerantScope$1.get(ExtensionFinder.java:426)

at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:41)
at com.google.inject.internal.InjectorImpl$3$1.call(InjectorImpl.java:1005)
at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1051)
at com.google.inject.internal.InjectorImpl$3.get(InjectorImpl.java:1001)
at hudson.ExtensionFinder$GuiceFinder._find(ExtensionFinder.java:388)
at hudson.ExtensionFinder$GuiceFinder.find(ExtensionFinder.java:379)
at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:343)
at hudson.ExtensionList.load(ExtensionList.java:300)
at hudson.ExtensionList.ensureLoaded(ExtensionList.java:253)
at hudson.ExtensionList.iterator(ExtensionList.java:143)
at hudson.ExtensionList.get(ExtensionList.java:134)
at com.cloudbees.plugins.credentials.SystemCredentialsProvider.getInstance(SystemCredentialsProvider.java:445)
at com.cloudbees.plugins.credentials.SystemCredentialsProvider$ProviderImpl.getCredentials(SystemCredentialsProvider.java:531)
at com.cloudbees.plugins.credentials.CredentialsProvider.lookupCredentials(CredentialsProvider.java:462)
at com.cloudbees.plugins.credentials.CredentialsProvider.lookupCredentials(CredentialsProvider.java:416)
at hudson.plugins.libvirt.Hypervisor.lookupSystemCredentials(Hypervisor.java:381)
at hudson.plugins.libvirt.Hypervisor.createBuilder(Hypervisor.java:117)
at hudson.plugins.libvirt.Hypervisor.getOrCreateConnection(Hypervisor.java:131)
at hudson.plugins.libvirt.Hypervisor.getDomains(Hypervisor.java:214)
at hudson.plugins.libvirt.Hypervisor.getVirtualMachines(Hypervisor.java:262)
at hudson.plugins.libvirt.VirtualMachineLauncher.lookupVirtualMachineHandle(VirtualMachineLauncher.java:77)
at hudson.plugins.libvirt.VirtualMachineLauncher.launch(VirtualMachineLauncher.java:125)
at hudson.slaves.SlaveComputer$1.call(SlaveComputer.java:240)
at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:701)
Jan 8, 2015 10:48:53 AM hudson.plugins.libvirt.Hypervisor getOrCreateConnection
INFO: Trying to establish a connection to hypervisor URI: qemu+ssh://gkr@192.168.122.1:22/system?no_tty=1 as gkr/******
: Connection reset by peer recv data: Permission denied (publickey,password).
Jan 8, 2015 10:48:53 AM hudson.plugins.libvirt.Hypervisor getOrCreateConnection
SEVERE: Failed to establish connection to hypervisor URI: qemu+ssh://gkr@192.168.122.1:22/system?no_tty=1 as gkr/******
: Connection reset by peer.VirtException: org.libvirt.LibvirtException: Cannot recv data: Permission denied (publickey,password).
at hudson.plugins.libvirt.lib.libvirt.LibVirtConnectImpl.<init>(LibVirtConnectImpl.java:25)
at hudson.plugins.libvirt.lib.ConnectionBuilder.build(ConnectionBuilder.java:97)
at hudson.plugins.libvirt.Hypervisor.getOrCreateConnection(Hypervisor.java:137)
at hudson.plugins.libvirt.Hypervisor.getDomains(Hypervisor.java:214)
at hudson.plugins.libvirt.Hypervisor.getVirtualMachines(Hypervisor.java:262)
at hudson.plugins.libvirt.VirtualMachineLauncher.lookupVirtualMachineHandle(VirtualMachineLauncher.java:77)
at hudson.plugins.libvirt.VirtualMachineLauncher.launch(VirtualMachineLauncher.java:125)
at hudson.slaves.SlaveComputer$1.call(SlaveComputer.java:240)
at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:701)
: Connection reset by peervirtException: Cannot recv data: Permission denied (publickey,password).
at org.libvirt.ErrorHandler.processError(Unknown Source)
at org.libvirt.Connect.processError(Unknown Source)
at org.libvirt.Connect.<init>(Unknown Source)
at hudson.plugins.libvirt.lib.libvirt.LibVirtConnectImpl.<init>(LibVirtConnectImpl.java:23)
... 13 more

Just rip out slf4j from the class mentioned, it's unused anyway. Plus, you have two plugin elements for maven-hpi-plugin, accompanied by a huge warning upon hpi:run – merge these.

Then at least Jenkins loads without problems, and the UI works. Since I don't use libvirt I have no way to proceed further.

Hi Daniel, your help is very much appreciated, I am not used to maven, not to speak of development for jenkins.
your suggestion worked.

So... does the plugin itself work now, i.e. does that change fix this reported issue?

If so, time to file a pull request on GitHub

pull request done, i hope it will get merged

Nice job !

I take a look to this page : https://wiki.jenkins-ci.org/display/JENKINS/Pull+Request+to+Repositories

However, if your pull request doesn't seem to be getting any attention after a week or so, then unfortunately we don't have existing developers reviewing incoming pull requests. Perhaps the repository is not actively maintained any more. In this case, we don't want your pull request to be in limbo forever, and hence we'd like you to escalate as follows:

• If you are comfortable with the change and you feel it should be merged in the absence of a review, please drop us an e-mail on the dev list and ask for commit access (please provide your GitHub account name and the repository name you would like to contribute to). See the later section for more information about what you should be careful about. As explained in Governance Document#Howtojointheproject, we give out commit access to anyone who asks for it. Once the committership is granted, please merge the change, and consider making a new release.
• If you feel that the code really needs to be reviewed by someone more knowledgeable, then similarly drop us an e-mail on the dev list and tell us why/what should be reviewed. And

If your job is not merged next week, you can ask it by mail.

Regards,

Hello,

Could you tell me if you did this request ?
Otherwise I can do it for you with pleasure.

Thanks a lot.

Regards,

Code changed in jenkins
User: G.Kr
Path:
pom.xml
src/main/java/hudson/plugins/libvirt/VirtualMachineManagement.java
http://jenkins-ci.org/commit/libvirt-slave-plugin/fb3cbbec03f8bc0ec323a3cd4121128699e54085
Log:
package old JNA version 3.3.0 with the plugin

fixes #JENKINS-12523
https://issues.jenkins-ci.org/browse/JENKINS-12523

Code changed in jenkins
User: g-k-r
Path:
pom.xml
src/main/java/hudson/plugins/libvirt/VirtualMachineManagement.java
http://jenkins-ci.org/commit/libvirt-slave-plugin/f01db463cea91000c693eb169b46fb722ac6dcfe
Log:
Merge pull request #10 from g-k-r/JENKINS-12523

package old JNA version 3.3.0 with the plugin

Compare: https://github.com/jenkinsci/libvirt-slave-plugin/compare/06470747e503...f01db463cea9

It looks like this problem has been fixed in Git but there's not been a release that contains the fix since then. Is there any chance of a release of the plugin?

Thanks.

i wanted to integrate one more PR, will try to do the snapshot release tomorrow. would you be able to test ?

> would you be able to test ?

Yes I can.

Am I wrong or the libvirt plugin is kinda useless due to this bug. Still it seems to be listed in the production repository.

fixed with release 1.8.5

1.8.5 works for me. Thanks for all your your hard work!

I get the same issue as G. Kr. with Plugin 1.8.5, Jenkins 1.6.20, and OpenJDK 1.7

javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class org.libvirt.Connect
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
	at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
	at hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:58)
	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:129)
	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:123)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:49)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
	at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
	at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:370)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
	at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
	at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.libvirt.Connect
	at hudson.plugins.libvirt.lib.libvirt.LibVirtConnectImpl.<init>(LibVirtConnectImpl.java:23)
	at hudson.plugins.libvirt.lib.ConnectionBuilder.build(ConnectionBuilder.java:97)
	at hudson.plugins.libvirt.Hypervisor$DescriptorImpl.doTestConnection(Hypervisor.java:455)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)
	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:121)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
	... 65 more

Hi Karl Katzke,

can you confirm that jenkins 1.6.20 is the first version to fail again ?

Nope, sadly, I can't. I'm just setting this up for the first time.

I assume you verified that the native libvirt is installed on the jenkins master host.

it would be great if you could try an earlier version of jenkins from here:
http://mirrors.jenkins-ci.org/war/
the native packages are linked at http://jenkins-ci.org/
e.g. for debian http://pkg.jenkins-ci.org/debian/

I can confirm that the JNA is installed (prereq to libvirt), and that libvirt is installed:

kkatzke@jenkins:~$ java -jar /usr/share/java/jna.jar
Java Native Access (JNA) API Version 4
Version: 4.1.0 (b4)
 Native: 4.0.0 (1a6047467b59e8748f975e03016ce3d9)
 Prefix: linux-x86-64
kkatzke@jenkins:~$ java -jar /usr/share/java/libvirt.jar
no main manifest attribute, in /usr/share/java/libvirt.jar
kkatzke@jenkins:~$ java -version
java version "1.7.0_79"
OpenJDK Runtime Environment (IcedTea 2.5.5) (7u79-2.5.5-0ubuntu0.14.04.2)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)

It is, by the way, libvirt-0.5.1.jar – I built it from source earlier today.

Interestingly, when I try to click the "Use Native Java libvirt client" checkbox, I get this error:

com.cloudbees.jenkins.plugins.sshcredentials.impl.BasicSSHUserPrivateKey cannot be cast to com.cloudbees.plugins.credentials.common.StandardUsernamePasswordCredentials

I didn't actually compile Jenkins myself. I'm pulling the Jenkins packages from http://pkg.jenkins-ci.org/debian

I did compile my own libvirt.jar since the libvirt library that Ubuntu supplies does not seem to come with the Java bindings.

cannot reproduce Karl Katzke's problem with jenkins 1.620 and libvirt 0.9.12 and libvirt 1.2.9

Karl Katzke if the problem for you persists please create a new bug report and include details of your OS. e.g. virsh --version

closing as fixed