Hi,

When the "Error: Exception" with a stack trace was produced, the Jenkins winstone service reported a healthy HTTP 200 status code. I believe this should have reported an HTTP 500 internal server error. Here's how the status codes should be as I see it...

• HTTP 503 Service Unavailable - Jenkins is booting, please wait...
• HTTP 403 forbidden - accessing resources not authorized.
• HTTP 401 authorization required - accessing URLs while not authenticated.
• HTTP 500 Internal server error - an internal Jenkins exception occurred.

Use case
I encounter issues when upgrading:

• Folders plugin from 5.1 to 5.2.1
• Matrix Authorization Strategy Plugin from 1.2 to 1.3.

hudson.util.HudsonFailedToLoad: org.jvnet.hudson.reactor.ReactorException: java.lang.Error: java.lang.reflect.InvocationTargetException
at hudson.WebAppMain$3.run(WebAppMain.java:237)
Caused by: org.jvnet.hudson.reactor.ReactorException: java.lang.Error: java.lang.reflect.InvocationTargetException
at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:269)
at jenkins.InitReactorRunner.run(InitReactorRunner.java:44)
at jenkins.model.Jenkins.executeReactor(Jenkins.java:935)
at jenkins.model.Jenkins.<init>(Jenkins.java:816)
at hudson.model.Hudson.<init>(Hudson.java:83)
at hudson.model.Hudson.<init>(Hudson.java:79)
at hudson.WebAppMain$3.run(WebAppMain.java:225)
Caused by: java.lang.Error: java.lang.reflect.InvocationTargetException
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:110)
at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:176)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$8.runTask(Jenkins.java:924)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:106)
... 8 more
Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(ArrayList.java:653)
at java.util.ArrayList.get(ArrayList.java:429)
at hudson.ExtensionList.get(ExtensionList.java:171)
at hudson.PluginManager$PluginUpdateMonitor.getInstance(PluginManager.java:1347)
at hudson.maven.PluginImpl.init(PluginImpl.java:58)
... 13 more

Some additional notes:

• When I disable security, the issue remains and Jenkins is unusable - https://wiki.jenkins-ci.org/display/JENKINS/Disable+security
• Even when I bootstrap again and upgrade all of the plugins and not just those two I still get the error.

Workaround

if [ "200" = "$(curl -sLI -w "%{http_code}\\n" -o /dev/null http://localhost:8080)" ] && curl -sL http://localhost:8080 | grep Exception &> /dev/null; then 
echo "Jenkins Error" 
fi