Hi,

I cannot install "Checkstyle-plugin"¹ for time being.

I select the plugin at /pluginManager/available to be installed. After Donwload+Restarting the plugin is still not installed.

The Jenkins.log give me:
Feb 27, 2013 5:40:15 PM jenkins.InitReactorRunner$1 onTaskFailed
SEVERE: Failed Loading plugin checkstyle
hudson.util.IOException2: Failed to initialize
at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:371)
at hudson.PluginManager$2$1$1.run(PluginManager.java:333)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:883)
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$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.NoClassDefFoundError: org/apache/xml/serialize/OutputFormat
at hudson.plugins.checkstyle.rules.TopicRule.extractNoteContent(TopicRule.java:63)
at hudson.plugins.checkstyle.rules.TopicRule.end(TopicRule.java:40)
at org.apache.commons.digester.Rule.end(Rule.java:257)
at org.apache.commons.digester.Digester.endElement(Digester.java:1345)
at org.apache.commons.digester.NodeCreateRule$NodeBuilder.endElement(NodeCreateRule.java:236)
at org.apache.commons.digester.Digester.endElement(Digester.java:1279)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:606)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1742)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2900)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:607)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:489)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:835)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1210)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:568)
at org.apache.commons.digester.Digester.parse(Digester.java:1916)
at hudson.plugins.checkstyle.rules.CheckStyleRules.initialize(CheckStyleRules.java:60)
at hudson.plugins.checkstyle.CheckStylePlugin.start(CheckStylePlugin.java:14)
at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:379)
at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:368)
... 9 more
Caused by: java.lang.ClassNotFoundException: org.apache.xml.serialize.OutputFormat
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 30 more

¹ https://wiki.jenkins-ci.org/display/JENKINS/Checkstyle+Plugin