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Bug
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Resolution: Fixed
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Major
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Post-launch
Error
hudson.util.HudsonFailedToLoad: org.jvnet.hudson.reactor.ReactorException: java.lang.Error: java.lang.reflect.InvocationTargetException
at hudson.WebAppMain$3.run(WebAppMain.java:248)
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:47)
at jenkins.model.Jenkins.executeReactor(Jenkins.java:1062)
at jenkins.model.Jenkins.<init>(Jenkins.java:905)
at hudson.model.Hudson.<init>(Hudson.java:85)
at hudson.model.Hudson.<init>(Hudson.java:81)
at hudson.WebAppMain$3.run(WebAppMain.java:231)
Caused by: java.lang.Error: java.lang.reflect.InvocationTargetException
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:110)
at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:175)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:1038)
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(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:104)
... 8 more
Caused by: java.io.IOException: Tried to treat 'C:\Program Files (x86)\Jenkins\jobs\Sttarter Android Project\lastStable' as a directory, but could not get a listing
at com.github.mjdetullio.jenkins.plugins.multibranch.TemplateDrivenMultiBranchProject.getConfigFiles(TemplateDrivenMultiBranchProject.java:717)
at com.github.mjdetullio.jenkins.plugins.multibranch.TemplateDrivenMultiBranchProject.getConfigFiles(TemplateDrivenMultiBranchProject.java:732)
at com.github.mjdetullio.jenkins.plugins.multibranch.TemplateDrivenMultiBranchProject.getConfigFiles(TemplateDrivenMultiBranchProject.java:732)
at com.github.mjdetullio.jenkins.plugins.multibranch.TemplateDrivenMultiBranchProject.migrate(TemplateDrivenMultiBranchProject.java:758)
... 13 more
- blocks
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- Closed
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[JENKINS-41241] Jenkins Failes to startup, Without updatating any plugin (WebAppMain.java:248)
Veeresh r
added a comment - The issue get resolves when you delete all the plugins from Jenkins Installation folder
Follow these steps (Windows installation)
1. Go to Jenkins installation folder in "C:\Program files\Jenkins\Plugins" copy all the files in some other drive for future reference.
2. Stop Jenkins server : Go to Control Panel\All Control Panel Items\Administrative Tools\Services search for Jenkins and stop it
3. Delete all the files in the "C:\Program files\Jenkins\Plugins"
folder
4. Restart the Jenkins your good to go but all the plugins will have to be reinstalled
5. Refer the "Plugins " folder which you have copied in some other destination and install the plugins
Veeresh r
added a comment - The issue get resolves when you delete all the plugins from Jenkins Installation folder
Follow these steps (Windows installation)
1. Go to Jenkins installation folder in "C:\Program files\Jenkins\Plugins" copy all the files in some other drive for future reference.
2. Stop Jenkins server : Go to Control Panel\All Control Panel Items\Administrative Tools\Services search for Jenkins and stop it
3. Delete all the files in the "C:\Program files\Jenkins\Plugins"
folder
4. Restart the Jenkins your good to go but all the plugins will have to be reinstalled
5. Refer the "Plugins " folder which you have copied in some other destination and install the plugins 
vamsi krishna
added a comment - Hi Veeresh,
Thanks for the solution you really save my day,
no need to remove all plugins folder remove Cloud Bees plugin from plugins folder and start jenkins.
vamsi krishna
added a comment - Hi Veeresh,
Thanks for the solution you really save my day,
no need to remove all plugins folder remove Cloud Bees plugin from plugins folder and start jenkins. 
kyle ian
added a comment - The above suggestion to remove the cloudbees plugin from the plugins folder results in Jenkins losing reference of the prior existing jobs / workspaces. Is there a better way to solve this?
kyle ian
added a comment - The above suggestion to remove the cloudbees plugin from the plugins folder results in Jenkins losing reference of the prior existing jobs / workspaces. Is there a better way to solve this? I came across this problem and did as the first comment said, but even if I deleted all the files in plugin folder and then restart, jenkins still seems to fail. What shows is the same as the earlier attachment here above. PS: I deploy jenkins on a Linux machine.
Elbert Wang
added a comment - - edited I came across this problem and did as the first comment said, but even if I deleted all the files in plugin folder and then restart, jenkins still seems to fail. What shows is the same as the earlier attachment here above. PS: I deploy jenkins on a Linux machine. 
Resolved the Issue by deleting all plugins in Jenkins Installation folder and restart the Jenkins,
It will restart but again you have to install all the plugins for your jobs
frustrating but there is no option
for any doubts please comment
thanks.