Starting with hudson-1284, the Batch Tasks plugin stops working, and, more
severely, when it is invoked kills the executor with this stack trace

Thread has died

java.lang.IncompatibleClassChangeError: Found class hudson.model.Node, but
interface was expected
at hudson.plugins.batch_task.BatchTask.getAssignedLabel(BatchTask.java:99)
at hudson.model.Queue.choose(Queue.java:633)
at hudson.model.Queue.pop(Queue.java:553)
at hudson.model.Executor.run(Executor.java:97)

(taken from http://buildserver:8000/hudson/computers/0/executors/0/causeOfDeath)

After the error hudson becomes unreachable, and the firefox browser reports

Content Encoding Error

The page you are trying to view cannot be shown because it uses an invalid or
unsupported form of compression.

A web container restart is required to regain control of the build server.

The full stack trace on the console is:

org.apache.commons.jelly.JellyTagException:
jar:file:/tmp/Jetty_0_0_0_0_8000_hudson.war__hudson__-ouqyzf/webapp/WEB-INF/lib/hudson-core-1.284.jar!/lib/hudson/queue.jelly:60:62:
<j:set> Found class hudson.model.Node, but interface was expected
at org.apache.commons.jelly.impl.TagScript.handleException(TagScript.java:713)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:282)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:150)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.OtherwiseTag.doTag(OtherwiseTag.java:41)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.ChooseTag.doTag(ChooseTag.java:38)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at
org.kohsuke.stapler.jelly.CustomTagLibrary$StaplerDynamicTag$1.run(CustomTagLibrary.java:139)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at
org.kohsuke.stapler.jelly.CustomTagLibrary$StaplerDynamicTag$1.run(CustomTagLibrary.java:139)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.IfTag.doTag(IfTag.java:42)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.kohsuke.stapler.jelly.IncludeTag.doTag(IncludeTag.java:114)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at
org.kohsuke.stapler.jelly.CustomTagLibrary$StaplerDynamicTag$1.run(CustomTagLibrary.java:139)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.kohsuke.stapler.jelly.CompressTag.doTag(CompressTag.java:21)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at
org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:29)
at
org.kohsuke.stapler.jelly.JellyClassTearOff.serveIndexJelly(JellyClassTearOff.java:43)
at org.kohsuke.stapler.jelly.JellyFacet.handleIndexRequest(JellyFacet.java:70)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:427)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:459)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:356)
at org.kohsuke.stapler.Stapler.service(Stapler.java:116)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1089)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:91)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:83)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1080)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:75)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:67)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:133)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1080)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:361)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:219)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:738)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:113)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:325)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:859)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:391)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: java.lang.IncompatibleClassChangeError: Found class
hudson.model.Node, but interface was expected
at hudson.plugins.batch_task.BatchTask.getAssignedLabel(BatchTask.java:99)
at hudson.model.Queue$BuildableItem.isStuck(Queue.java:1074)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.commons.jexl.util.introspection.UberspectImpl$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:71)
at org.apache.commons.jelly.tags.core.SetTag.doTag(SetTag.java:84)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
... 130 more