Getting this error when trying to compile and execute java program from git

Question

Started by user Samar Dhiman
Running as SYSTEM
Building in workspace C:\ProgramData\Jenkins\.jenkins\workspace\Java-stream-api
The recommended git tool is: NONE
No credentials specified
 > C:\Program Files\Git\bin\git.exe rev-parse --resolve-git-dir C:\ProgramData\Jenkins\.jenkins\workspace\Java-stream-api\.git # timeout=10
Fetching changes from the remote Git repository
FATAL: java.io.IOException: Unknown repository format
org.eclipse.jgit.errors.ConfigInvalidException: Invalid line in config file
    at org.eclipse.jgit.lib.Config.fromTextRecurse(Config.java:1236)
    at org.eclipse.jgit.lib.Config.fromText(Config.java:1164)
    at org.eclipse.jgit.storage.file.FileBasedConfig.load(FileBasedConfig.java:164)
    at org.eclipse.jgit.util.FileUtils.readWithRetries(FileUtils.java:733)
    at org.eclipse.jgit.storage.file.FileBasedConfig.load(FileBasedConfig.java:128)
Caused: org.eclipse.jgit.errors.ConfigInvalidException: Cannot read file C:\ProgramData\Jenkins\.jenkins\workspace\Java-stream-api\.git\config
    at org.eclipse.jgit.storage.file.FileBasedConfig.load(FileBasedConfig.java:137)
    at org.eclipse.jgit.internal.storage.file.FileRepository.loadRepoConfig(FileRepository.java:212)
Caused: java.io.IOException: Unknown repository format
    at org.eclipse.jgit.internal.storage.file.FileRepository.loadRepoConfig(FileRepository.java:214)
    at org.eclipse.jgit.internal.storage.file.FileRepository.<init>(FileRepository.java:170)
    at org.eclipse.jgit.lib.BaseRepositoryBuilder.build(BaseRepositoryBuilder.java:627)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.getRepository(CliGitAPIImpl.java:3593)
Caused: hudson.plugins.git.GitException
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.getRepository(CliGitAPIImpl.java:3595)
    at hudson.plugins.git.GitAPI.getRepository(GitAPI.java:347)
    at jenkins.plugins.git.GitHooksConfiguration.configure(GitHooksConfiguration.java:96)
    at jenkins.plugins.git.GitHooksConfiguration.configure(GitHooksConfiguration.java:90)
    at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1233)
    at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1305)
    at hudson.scm.SCM.checkout(SCM.java:540)
    at hudson.model.AbstractProject.checkout(AbstractProject.java:1248)
    at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:649)
    at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:85)
    at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:521)
    at hudson.model.Run.execute(Run.java:1895)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:44)
    at hudson.model.ResourceController.execute(ResourceController.java:101)
    at hudson.model.Executor.run(Executor.java:442)
Finished: FAILURE

I want to compile and execute the java code from git I have set up all the configurations like set up paths for git, jdk and maven but getting this error.

This is my repository url - https://github.com/samardhiman007/Stream-Api-Jenkins-Testing.git

And these are the commands that I am using - javac Main.java java Main