Jgit:Bare Repository has neither a working tree, nor an index

Question

i have created a directory in E named it gitrepo full path is (E:\gitrepo) after then i have cloned a repository in it with the following code

Git git=Git.cloneRepository()
                .setURI("samplelink.git")
                .setDirectory(new File("/E:/gitrepo"))
                .call();

then i opened a repository using this code

public Repository openRepository() throws IOException {
    FileRepositoryBuilder builder = new FileRepositoryBuilder();

    Repository repository = builder.setGitDir(new File("/E:/gitrepo"))
            .readEnvironment() // scan environment GIT_* variables
            .findGitDir() // scan up the file system tree
            .build();
     log.info("Repository directory is {}", repository.getDirectory());

    return repository;
}

everything worked fine till here then i tried to add a file in this local repository

Repository repo = openRepository();
            Git git = new Git(repo);
            File myfile = new File(repo.getDirectory()/*.getParent()*/, "testfile");
            if (!myfile.createNewFile()) {
                throw new IOException("Could not create file " + myfile);
            }
            log.info("file created at{}", myfile.getPath());
            git.add().addFilepattern("testfile").call();

Then i got exception on this line

git.add().addFilepattern("testfile").call();

here is the exception

Exception in thread "main" org.eclipse.jgit.errors.NoWorkTreeException: Bare Repository has neither a working tree, nor an index
    at org.eclipse.jgit.lib.Repository.getIndexFile(Repository.java:1147)
    at org.eclipse.jgit.dircache.DirCache.lock(DirCache.java:294)
    at org.eclipse.jgit.lib.Repository.lockDirCache(Repository.java:1205)
    at org.eclipse.jgit.api.AddCommand.call(AddCommand.java:149)
    at com.km.GitAddFile.addFile(GitAddFile.java:26)

although the file code created in E:\gitrepo i have checked gitrepo is non-bare-repository by this command

/e/gitrepo (master)
$ git rev-parse --is-bare-repository 

and its returning false

please help how can i resolve this exception

Answer 1

Opening a Git repository using FileRepositoryBuilder is tricky. This is an internal class. Its method setGitDir(File) defines the location of the repository metadata (the .git folder). In other words, it is used to construct a Git bare repository. You can prove it by calling the Repository#isBare():

Repository repository = builder.setGitDir(new File("/E:/gitrepo"))
        .readEnvironment() // scan environment GIT_* variables
        .findGitDir() // scan up the file system tree
        .build();
repository.isBare(); // returns true

You should replace this usage by Git#open(File):

try (Git git = Git.open(new File("/E:/gitrepo"))) {
    // Do sth ...
}