If you don't want to remove analysis-collector, installing Dashboard view plugin should solves the problem as well. It seems that Guice container doesn't distinguish optional extensions points properly and fails to load when some optional dependency is missing.

Will be fixed in 1.462.
See JENKINS-13448.

I'm still seeing this in Jenkins 1.487.
I've had Git Plugin installed for a very long time. When I installed Git-parameter plugin, things went haywire. However, manually removing Git parameter plugin did not fix the problem. Only removing Git plugin fixes it.

Similar happened for me (after disabling/uninstalling a couple plugins & restart)

Caused by: java.lang.NullPointerException
	at hudson.plugins.git.GitTool.onLoaded(GitTool.java:105)
	... 13 more

This on 1.538

This seems to let me work again:

cd ~jenkins/plugins/
mv git-client.jpi git-client.jpi.disabled

If I look at the MANIFEST.MF in that jpi:

Plugin-Version: 1.3.0
Jenkins-Version: 1.480

Am on Jenkins 1.540 and am seeing the same problem. analysis-collector isn't installed, the "Dashboard view" plugin is available. Installing it didn't help. Here again goes the exception I'm seeing after restart:

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:43)
at jenkins.model.Jenkins.executeReactor(Jenkins.java:915)
at jenkins.model.Jenkins.<init>(Jenkins.java:811)
at hudson.model.Hudson.<init>(Hudson.java:81)
at hudson.model.Hudson.<init>(Hudson.java:77)
at hudson.WebAppMain$3.run(WebAppMain.java:221)
Caused by: java.lang.Error: java.lang.reflect.InvocationTargetException
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:109)
at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:169)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:904)
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:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:105)
... 8 more
Caused by: java.lang.NullPointerException
at hudson.plugins.git.GitTool.onLoaded(GitTool.java:105)
... 13 more

This problem has been going on for months now. Guys... we need this git support!

Updating git.jpi to version 2.0 seemed to fix it on our instance.

It returns when restarting jenkins. But installing the plugin does not give issues.

I was able to see a similar null pointer exception if I disabled the credentials plugin while the git plugin and the git client plugin were both enabled. When I restarted Jenkins, it failed to restart with the null pointer exception.

After doing that, I removed plugins/credentials.jpi.disabled and restarted Jenkins. It started correctly. The credentials plugin must be enabled for the git plugin or the git client plugin (or both).

There may need to be some core extension which will allow a plugin to explicitly declare that it depends on another plugin being enabled.

Thanks, Mark. I started over with a fresh Jenkins under Ubuntu, upgraded the .war file to the latest release (1.532.2 as of this writing) and installed the credentials plugin. Of course, I had to use the JGit implementation instead of an external git executable to get the benefits of the credentials plugin, but then, fetching from git worked like a charm.

I'm glad you were able to authenticate. The external git executable should also work with the credentials plugin.