[Demonstration 1]

[Buggy Method]
@Override
public String toString() {
    return "constraint " + actuator.getName() + " to " + getFunction().toString() + " with " + getAmount();
}

[Buggy Hunk]
return "constraint " + actuator.getName()+ " to " + getFunction().toString() + " with " + getAmount();

[Patch]
return "constraint " + brick.getName()+ " to " + getFunction().toString() + " with " + getAmount();

[Demonstration 2]

[Buggy Method]
public boolean isRenter(UUID uuid) {
    OfflinePlayer renter = getRenter();
    return renter == null ? false : renter.getUniqueId().equals(uuid);
}

[Buggy Hunk]
return renter==null ? false : renter.getUniqueId().equals(uuid);

[Patch]
return renter != null && renter.getUniqueId().equals(uuid);

[Demonstration 3]

[Buggy Method]
@Override
public void execute() {
    Guild guild = new Guild(null, name, tag, color, 0.0);
    plugin.getGuildManager().create(guild, sender);
    plugin.getEconomy().withdrawPlayer(sender, plugin.getGuildsConfig().getLevelData(1).getCost());
    plugin.getChat().sendMessage(sender, plugin.getGuildsConfig().getColoredText("info.guild.create.guildCreated", guild.getColor()).replace("{0}", guild.getName()));
    plugin.getLogger().info(sender.getName() + " has created guild '" + guild.getName() + "'");
}

[Buggy Hunk]
Guild guild = new Guild(null, name, tag, color, 0.0);

[Patch]
Guild guild = new Guild(-1, name, tag, color, 0.0);