Varun Kumar Varun Kumar - 1 month ago 19
Git Question

Retrieving Commit Message Log from Git Using JGit

I just want to retrieve the commitlog from Git repository that has messages for all the commit you've done on a specific repopsitory. I had found some code snippets for achieve this and ends with an exception.

try {
FileRepositoryBuilder builder = new FileRepositoryBuilder();
Repository repo = builder.setGitDir(new File("https://github.com/name/repository.git")).readEnvironment().findGitDir().build();
RevWalk walk =new RevWalk(repo);
ObjectId head = repo.resolve(Constants.HEAD);
RevCommit commit =walk.parseCommit(head);
Git git =new Git(repo);
Iterable<RevCommit> gitLog = git.log().call();
Iterator<RevCommit> it = gitLog.iterator();
while(it.hasNext())
{
RevCommit logMessage = it.next();
System.out.println(logMessage.getFullMessage());
}
}
catch(Exception e) {
e.printStackTrace();
}


However it gives me:

org.eclipse.jgit.api.errors.NoHeadException: No HEAD exists and no explicit starting revision was specified exception.


How do I get rid of this? I am using org.eclipse.jgit JAR version 2.0.0.201206130900-r

Answer

This is correct of piece of code will do the above..

FileRepositoryBuilder builder = new FileRepositoryBuilder();
Repository repo = builder.setGitDir(new File("localrepositary"+"\\.git")).setMustExist(true).build();
Git git = new Git(repo);
Iterable<RevCommit> log = git.log().call();
for (Iterator<RevCommit> iterator = log.iterator(); iterator.hasNext();) {
  RevCommit rev = iterator.next();
  logMessages.add(rev.getFullMessage());
}
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