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Mon, 14 March 2011 11:17

Eclipse User

This term I have to integry JGit to our project for my lab.
when I copy the code from the forum:

RepositoryBuilder builder = new RepositoryBuilder();
File repos = new File("E:\\pmsSpace\\testGit\\test\\basedir\\.git");
Repository repository = builder.setGitDir(repos).build();
Git git = new Git(repository);

LogCommand log = git.log();

for (RevCommit commit : log.call()) {
System.out.println(commit.getAuthorIdent().getName());
System.out.println(commit.getAuthorIdent().getWhen());
System.out.println(commit.getFullMessage());
}

then i run it in Eclipse3.5, the error comes out:
org.eclipse.jgit.api.errors.NoHeadException: No HEAD exists and no explicit starting revision was specified
at org.eclipse.jgit.api.LogCommand.call(LogCommand.java:103)

Hope someone could help me out, thx a lot!

YiFei
BeiJing.China

Re: [help ] new to JGit [message #659601 is a reply to message #659560]

Mon, 14 March 2011 14:51

Eclipse User

Looks like your repository is empty.

How about doing some commits with CommitCommand?

You can add a file with AddCommand too.

Re: [help ] new to JGit [message #659650 is a reply to message #659601]

Mon, 14 March 2011 21:06

Eclipse User

thx, I do some adds and commits in one function,the code:

File basedir = new File("test/basedir");
//deleteFileTree(basedir);
basedir.mkdir();

RepositoryBuilder builder = new RepositoryBuilder();
builder.setGitDir(new File(basedir, ".git"));

Repository repo = builder.build();
repo.create();

Git git = new Git(repo);

new File(basedir, "aa").createNewFile();

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

git.commit()
.setAll(true)
.setMessage("besouro automatic message")
.setCommitter("somename", "someemail")
.call();

the error still occurs, but if I copy the code out of the function and put it just before theLogCommand code, it runs smoothly, I just cann't figure it out.

Re: [help ] new to JGit [message #659947 is a reply to message #659650]

Wed, 16 March 2011 06:13

Eclipse User

That's intentional. Native git behaves the same. Just try out:

cd <tmpFolder>
git init test
cd test
git log

and you will also see an error message about a missing HEAD.

Problem is that newly created repositories where no commit has been done don't have a branch (even master is not yet born) and therefore HEAD is also not pointing to something exisiting. My suggestion is not to call log() on repo's which you know are empty (what would you expect from this call?) or to catch the NoHeadException.

Side topic: you can further streamline your code by using our API also for the repo initialization. See here:

File f = new File(...);
Git git = Git.init().setDirectory(f).call();
try {
	for (RevCommit commit : git.log().call()) {
		System.out.println(commit.getAuthorIdent().getName());
		System.out.println(commit.getAuthorIdent().getWhen());
		System.out.println(commit.getFullMessage());
	}
} catch (NoHeadException e) {
	System.out.println("Empty repo, nothing to log");
}

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