[Demonstration 1]

[Buggy Method]
private boolean removeService(Microservice service) {
    Map<String, MicroservicesRegistryImpl> microservicesRegistries = org.wso2.msf4j.internal.DataHolder.getInstance().getMicroservicesRegistries();
    if (microservicesRegistries.isEmpty()) {
        log.error("Microservice removal failed. Microservices Registry doesn't exist to register microservice.");
        return false;
    }
    microservicesRegistries.values().forEach(registry -> {
        registry.removeService(service.getClass().getAnnotation(Path.class).value());
        registry.preDestroyService(service);
    });
    log.info("Microservice undeployed successfully");
    return true;
}

[Buggy Hunk]
log.info("Microservice undeployed successfully");

[Patch]
log.info("Microservice {} undeployed successfully", service.getClass().getName());

[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]
protected ProbeTestClass getClassAnnotation(Description description) {
    return description.getMethod().getClass().getAnnotation(ProbeTestClass.class);
}

[Buggy Hunk]
return description.getMethod().getClass().getAnnotation(ProbeTestClass.class);

[Patch]
return description.getMethod().getDeclaringClass().getAnnotation(ProbeTestClass.class);