The attached threaddump shows a deadlock which was initiated when attempting to view a job in my Hudson instance.

The deadlock is at the following two threads (these are snippets from the attachment):

"Handling GET /view/Quicksilver/job/users-service/test/trend : http-8080-9":
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1394)

• waiting to lock <0xadf7e550> (a java.lang.String)
  at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1361)
  at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
• locked <0x700966f0> (a org.apache.catalina.loader.WebappClassLoader)
  at hudson.tasks.test.AbstractTestResultAction.createChart(AbstractTestResultAction.java:260)
  at hudson.tasks.test.AbstractTestResultAction.doGraph(AbstractTestResultAction.java:208)

"Handling GET /view/Quicksilver/job/users-service/tasks/trendGraph/png : http-8080-10":
at java.lang.ClassLoader.checkCerts(ClassLoader.java:745)

• waiting to lock <0x700966f0> (a org.apache.catalina.loader.WebappClassLoader)
  at java.lang.ClassLoader.preDefineClass(ClassLoader.java:484)
  at java.lang.ClassLoader.defineClass(ClassLoader.java:610)
  at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
  at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2527)
• locked <0xadf7e550> (a java.lang.String)
  at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1010)
  at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1483)
• locked <0xadf7e550> (a java.lang.String)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:296)
• locked <0x6ff84938> (a hudson.ClassicPluginStrategy$DependencyClassLoader)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:296)
• locked <0x6ff83078> (a java.net.URLClassLoader)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
  at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
• locked <0x6ff83078> (a java.net.URLClassLoader)
  at hudson.plugins.analysis.graph.CategoryBuildResultGraph.createAreaChart(CategoryBuildResultGraph.java:391)
  at hudson.plugins.analysis.graph.PriorityGraph.createChart(PriorityGraph.java:55)

I first started noticing this behavior when updating the Static Analysis Collector Plug-in, Checkstyle Plug-in, PMD Plug-in, and FindBugs Plug-in to the latest versions.

I tried to copy and paste the list of my installed plugins and version numbers.