Jenkins Git Plugin fails with NullPointerException

When I ran Jenkins job to build project, I got the following error message.

	Started by user superman
	Building in workspace /var/lib/jenkins/jobs/myproject/workspace
	Checkout:workspace / /var/lib/jenkins/jobs/myproject/workspace - hudson.remoting.LocalChannel@449b369
	Using strategy: Default
	FATAL: null
	java.lang.NullPointerException
	at hudson.plugins.git.GitSCM.resolveGitTool(GitSCM.java:821)
	at hudson.plugins.git.GitSCM.getGitExe(GitSCM.java:837)
	at hudson.plugins.git.GitSCM.getGitExe(GitSCM.java:830)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1088)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:1367)
	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:674)
	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:579)
	at hudson.model.Run.execute(Run.java:1575)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:477)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:237)

view raw NPE.java hosted with ❤ by GitHub

I found the answer from here.

1. Uninstall git client plugin
2. Restart, it would be automatically executed
3. Install git plugin, not git client. Git client is installed automatically too.
4. Confirm git is available and name it "default" on Manage Jenkins > Configure System

Enjoy!