[Demonstration 1]

[Buggy Method]
private void createAccount(String email, String password) {
    Log.d(TAG, "createAccount:" + email);
    if (!validateForm()) {
        return;
    }
    showProgressDialog();
    // [START create_user_with_email]
    mAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {

        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            Log.d(TAG, "createUserWithEmail:onComplete:" + task.isSuccessful());
            if (task.isSuccessful()) {
                sendEmailVerification();
            } else // If sign in fails, display a message to the user. If sign in succeeds
            // the auth state listener will be notified and logic to handle the
            // signed in user can be handled in the listener.
            {
                Toast.makeText(EmailPasswordActivity.this, R.string.auth_failed, Toast.LENGTH_SHORT).show();
            }
            // [START_EXCLUDE]
            hideProgressDialog();
            // [END_EXCLUDE]
        }
    });
    // [END create_user_with_email]
}

[Buggy Hunk]
mAuth.createUserWithEmailAndPassword(email, password)

[Patch]
auth.createUserWithEmailAndPassword(email, password)

[Demonstration 2]

[Buggy Method]
public static Result service(String ownerName, String projectName, String service, boolean isAdvertise) throws IOException, UnsupportedOperationException, ServletException {
    if (!isSupportedService(service)) {
        return forbidden(String.format("Unsupported service: '%s'", service));
    }
    Project project = Project.findByOwnerAndProjectName(ownerName, projectName);
    if (project == null) {
        return notFound();
    }
    models.User user = UserApp.currentUser();
    if (!isAllowed(project, service)) {
        if (user.isAnonymous()) {
            return BasicAuthAction.unauthorized(response());
        } else {
            // If you want the Git client showing your custom message to
            // the user, the Content-Type should be exact "text/plain"
            // without any parameter. For more details, see the code at
            // https://github.com/git/git/commit/426e70d4a11ce3b4f70636d57c6a0ab16ae08a00#diff-eea0ad565ec5903a11b6023755d491cfR154
            response().setHeader("Content-Type", "text/plain");
            return forbidden(String.format("'%s' has no permission to '%s/%s'.", user.name, ownerName, projectName));
        }
    }
    if (isAdvertise) {
        return ok(RepositoryService.gitAdvertise(project, service, response()));
    } else {
        if (request().body().isMaxSizeExceeded()) {
            return status(REQUEST_ENTITY_TOO_LARGE);
        } else {
            user.visits(project);
            return ok(RepositoryService.gitRpc(project, service, request(), response()));
        }
    }
}

[Buggy Hunk]
user.name, ownerName, projectName));

[Patch]
user.loginId, ownerName, projectName));

[Demonstration 3]

[Buggy Method]
boolean isPasswordValid(String password) {
    return (TextUtils.isEmpty(password) || password.length() <= 8);
}

[Buggy Hunk]
return (TextUtils.isEmpty(password) || password.length() <= 8);

[Patch]
return (TextUtils.isEmpty(password) || password.length() < 8);