[Demonstration 1]

[Buggy Method]
private static boolean hasAround(World world, Block id, BlockPos pos) {
    return world.getBlockState(pos.west()) == id && world.getBlockState(pos.east()) == id && world.getBlockState(pos.north()) == id && world.getBlockState(pos.south()) == id;
}

[Buggy Hunk]
return world.getBlockState(pos.west()) == id && world.getBlockState(pos.east()) == id && world.getBlockState(pos.north()) == id && world.getBlockState(pos.south()) == id;

[Patch]
return world.getBlockState(pos.west()).getBlock() == id && world.getBlockState(pos.east()).getBlock() == id && world.getBlockState(pos.north()).getBlock() == id && world.getBlockState(pos.south()).getBlock() == id;

[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]
@Override
public boolean onBlockStartBreak(ItemStack stack, BlockPos pos, EntityPlayer player) {
    if (!stack.hasTagCompound())
        return false;
    Item tntItem = Blocks.tnt.getItem(player.worldObj, pos);
    int charge = stack.getTagCompound().getInteger("charge");
    if (player.inventory.hasItem(tntItem) && charge > 0) {
        player.inventory.consumeInventoryItem(Blocks.tnt.getItem(player.worldObj, pos));
        if (!player.worldObj.isRemote) {
            player.worldObj.createExplosion(new EntityTNTPrimed(player.worldObj), (double) pos.getX() - 0.5, (double) pos.getY() - 0.5, (double) pos.getZ() - 0.5, 3, true);
        }
        stack.getTagCompound().setInteger("charge", charge - 1);
        return true;
    }
    return false;
}

[Buggy Hunk]
player.worldObj.createExplosion(new EntityTNTPrimed(player.worldObj), (double) pos.getX() - 0.5, (double) pos.getY() - 0.5, (double) pos.getZ() - 0.5, 3, true);

[Patch]
player.worldObj.createExplosion(new EntityTNTPrimed(player.worldObj), (double) pos.getX(), (double) pos.getY(), (double) pos.getZ(), 4, true);