Description Björn Kautler 2019-02-27 14:05:59 EST

When executing the following code with a file changed in the worktree:

Repository repo = new RepositoryBuilder().findGitDir(new File("path/to/repo")).setMustExist(true).build();
DiffFormatter diffFormatter = new DiffFormatter(System.out);
diffFormatter.setRepository(repo);
diffFormatter.format(new Git(repo).diff().setOldTree(new EmptyTreeIterator()).call().iterator().next());

you get a missing object exception.
In my case it is

org.eclipse.jgit.errors.MissingObjectException: Missing blob cb188f8580dd4e09a90757478e8be4b7b69f7c37
	at org.eclipse.jgit.internal.storage.file.WindowCursor.open(WindowCursor.java:170)
	at org.eclipse.jgit.diff.ContentSource$ObjectReaderSource.open(ContentSource.java:145)
	at org.eclipse.jgit.diff.ContentSource$Pair.open(ContentSource.java:282)
	at org.eclipse.jgit.diff.DiffFormatter.open(DiffFormatter.java:1073)
	at org.eclipse.jgit.diff.DiffFormatter.createFormatResult(DiffFormatter.java:1001)
	at org.eclipse.jgit.diff.DiffFormatter.format(DiffFormatter.java:706)
	at org.eclipse.jgit.diff.DiffFormatter$format$3.call(Unknown Source)
	at ConsoleScript15.run(ConsoleScript15:17)


Where the blob that is missing is the blob of the file in the work tree:

$ git diff
diff --git a/file-in-first-commit.xoo b/file-in-first-commit.xoo
index bd4a117..cb188f8 100644
--- a/file-in-first-commit.xoo
+++ b/file-in-first-commit.xoo
@@ -1,3 +1,4 @@
...