appsmithorg/appsmith · error · Exception

Error while rebasing the branch, {}

Error message

Error while rebasing the branch, {}

What it means

Thrown by FSGitHandlerCEImpl.rebaseBranch when JGit's RebaseCommand.call() returns a result whose status is not successful (e.g. CONFLICTS, FAILED, ABORTED, STOPPED). The handler logs the status and conflict list, runs an ABORT operation on the rebase to leave the working tree clean, ends the observation span, then throws a generic Exception carrying the status name. The reactive chain additionally onErrorMaps it for logging and applies a timeout. It is the terminal signal for a git rebase that could not be completed cleanly against origin/<branchName>.

Source

Thrown at app/server/appsmith-git/src/main/java/com/appsmith/git/handler/ce/FSGitHandlerCEImpl.java:1733

                                git -> Mono.fromCallable(() -> {
                                            Span jgitRebaseSpan = observationHelper.createSpan(GitSpan.JGIT_REBASE);
                                            RebaseResult result = git.rebase()
                                                    .setUpstream("origin/" + branchName)
                                                    .call();
                                            if (result.getStatus().isSuccessful()) {
                                                jgitRebaseSpan.end();
                                                return true;
                                            } else {
                                                log.error(
                                                        "Error while rebasing the branch, {}, {}",
                                                        result.getStatus().name(),
                                                        result.getConflicts());
                                                git.rebase()
                                                        .setUpstream("origin/" + branchName)
                                                        .setOperation(RebaseCommand.Operation.ABORT)
                                                        .call();
                                                jgitRebaseSpan.end();
                                                throw new Exception("Error while rebasing the branch, "
                                                        + result.getStatus().name());
                                            }
                                        })
                                        .onErrorMap(e -> {
                                            log.error("Error while rebasing the branch, {}", e.getMessage());
                                            return e;
                                        })
                                        .timeout(Duration.ofMillis(Constraint.TIMEOUT_MILLIS))
                                        .name(GitSpan.FS_REBASE)
                                        .tap(Micrometer.observation(observationRegistry)),
                                Git::close)
                        .subscribeOn(scheduler));
    }

    @Override
    public Mono<BranchTrackingStatus> getBranchTrackingStatus(Path repoSuffix, String branchName) {
        return Mono.using(
                        () -> Git.open(createRepoPath(repoSuffix).toFile()),

View on GitHub (pinned to 8cd9021c24)

Solutions

1. Inspect server logs for the line 'Error while rebasing the branch, {status}, {conflicts}' printed just before the throw - it names the RebaseResult.Status and the conflicting file paths.
2. From the Appsmith git UI, discard local changes (reset hard) on the affected branch and retry the pull/rebase so the branch matches origin exactly.
3. If a specific file conflict recurs, manually resolve it in a local clone, push to origin, then re-trigger the Appsmith sync.
4. Confirm the remote ref origin/<branchName> exists (git ls-remote origin) and that the configured default branch matches.
5. If this happens reproducibly on a large repo, raise Constraint.TIMEOUT_MILLIS or reduce the number of pending commits before rebasing.

Example fix

// before
return this.resetToLastCommit(repoSuffix, branchName, keepWorkingDirChanges)
    .flatMap(isCheckedOut -> Mono.using(... rebase ...));

// after - surface the RebaseResult so callers can recover instead of throwing blindly
if (!result.getStatus().isSuccessful()) {
    log.error("Rebase failed: status={}, conflicts={}",
        result.getStatus().name(), result.getConflicts());
    git.rebase().setUpstream("origin/" + branchName)
        .setOperation(RebaseCommand.Operation.ABORT).call();
    jgitRebaseSpan.end();
    throw new AppsmithPluginException(
        AppsmithPluginError.GIT_ACTION_FAILED,
        "Rebase failed with status " + result.getStatus().name()
        + "; conflicts: " + result.getConflicts());
}

// Before invoking rebaseBranch, confirm the branch is in a rebaseable state
Path repo = createRepoPath(repoSuffix);
try (Git git = Git.open(repo.toFile())) {
    Repository repository = git.getRepository();
    BranchTrackingStatus status = BranchTrackingStatus.of(repository, branchName);
    if (status == null || status.getAheadCount() == 0) {
        // nothing to rebase; skip the call
        return Mono.just(true);
    }
    // ensure upstream ref resolves
    if (repository.findRef("origin/" + branchName) == null) {
        return Mono.error(new IllegalStateException("Upstream ref origin/" + branchName + " missing"));
    }
} catch (IOException e) {
    return Mono.error(e);
}

// rebaseBranch returns Mono<Boolean> - handle the terminal error in the reactive chain
rebaseBranch(repoSuffix, branchName, false)
    .onErrorResume(e -> {
        log.error("Rebase failed for branch {}, attempting hard reset fallback", branchName, e);
        return resetHard(repoSuffix, branchName).then(Mono.just(false));
    });

When it happens

Trigger: Calling rebaseBranch(repoSuffix, branchName, keepWorkingDirChanges) where the local branch has commits that conflict with origin/<branchName>, where the index is in an unexpected state after resetToLastCommit, where the working directory contains untracked files that collide with rebase targets, or when a concurrent git operation on the same repository mutates state during the rebase. Also triggered if the JGit library cannot resolve the upstream ref origin/<branchName>.

Common situations: Two users editing the same application on the same git branch and one pulls/rebases; an auto-commit triggered by Appsmith colliding with a remote commit; a stale local checkout that diverged significantly; disk full or filesystem permission errors causing JGit to fail mid-rebase; timeouts exceeding Constraint.TIMEOUT_MILLIS during large rebases.

Related errors

• PE-PLG-5000
• PE-PLG-5003
• PE-GSH-5000
• PE-GSH-5000

AI-assisted analysis of appsmithorg/appsmith@8cd9021c24 (2026-08-12). Data as JSON: /api/errors/364a381c42361980. Report an issue: GitHub.