After upgrading to Jenkins version 1.568 it can not start.
The following is the last entry in the log file no matter how long I wait.
Exception in thread "Thread-3" java.lang.ClassCircularityError: java/util/logging/LogRecord
at net.bull.javamelody.LoggingHandler.publish(LoggingHandler.java:109)
at java.util.logging.Logger.log(Logger.java:616)
at java.util.logging.Logger.doLog(Logger.java:641)
at java.util.logging.Logger.log(Logger.java:730)
at winstone.Logger.logInternal(Logger.java:157)
at winstone.Logger.log(Logger.java:165)
Stopping Jenkins again and deleting file ./plugins/monitoring.jpi and folder ./plugins/monitoring/ allows me to get Jenkins running again, so that can work as a workaround
- is related to
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JENKINS-27669 Creating an empty logger crashs Jenkins
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- Closed
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[JENKINS-23442] Jenkins 1.568 can not start when monitoring plugin is installed
As said above, the monitoring plugin currently bundles the slf4j-api.
Can you try a new build of the monitoring plugin without the slf4j-api?
monitoring.hpi
is attached and is the same as v1.56 except slf4j-api.
You can install it in your Jenkins with Manage Jenkins / Manage plugins / Advanced / Upload plugin.
I tried the attached monitoring.hpi file with Jenkins 1.618. Unfortunately the problem and the exception remains.
Christian Wutte
added a comment - - edited I tried the attached monitoring.hpi file with Jenkins 1.618. Unfortunately the problem and the exception remains. 
moodysma moodysma
added a comment - Problem is still occurring. After reading JENKINS-27669, perhaps it is needed to preload the java.util.logging.LogRecord class, before net.bull.javamelody.LoggingHandler.publish(...) is called.
@jbrejner A possible cause triggering the issue for you may be that you have also the "Logging plugin" installed.
Code changed in jenkins
User: evernat
Path:
src/main/java/org/jvnet/hudson/plugins/monitoring/PluginImpl.java
http://jenkins-ci.org/commit/monitoring-plugin/0ad60da0038048ca69672022e54434cb3c5c87a3
Log:
try to fix JENKINS-23442 (ClassCircularityError: java/util/logging/LogRecord)
The code changed in the plugin is a tentative fix without having reproduced the issue myself.
So, I would like a confirmation from a user before saying that it is fixed.
To everyone:
You can test the fix by downloading a nightly build here:
https://javamelody.ci.cloudbees.com/job/jenkins%20plugin/ws/target/monitoring.hpi
It seems to be working for us, we had the same problem before. And now, after installing the snapshot it doesn't hang anymore (and we can acess /monitoring) 
I have the same issue.
I was running Jenkins 1.609.1 and then when I upgraded to 1.609.2.
I could only start Jenkins again after I removed monitoring plugin.
log4j:WARN No appenders could be found for logger (net.bull.javamelody).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "pool-6-thread-8" java.lang.ClassCircularityError: java/util/logging/LogRecord
at net.bull.javamelody.LoggingHandler.publish(LoggingHandler.java:109)
at java.util.logging.Logger.log(Logger.java:610)
at java.util.logging.Logger.doLog(Logger.java:631)
at java.util.logging.Logger.log(Logger.java:720)
at jenkins.InitReactorRunner$1.onTaskFailed(InitReactorRunner.java:71)
at org.jvnet.hudson.reactor.ReactorListener$Aggregator.onTaskFailed(ReactorListener.java:99)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:214)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
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:744)