Connecting to Voice Channel Creates Memory Leaks

[robot-rover]

Prerequisites

• If this is a question/suggestion, I have already considered talking about it on the Discord4J server
• This issue specifically has something to do with Discord4J
• I have attempted to look for similar issues
  already

Description

When you connect to a voice channel it creates 9 threads that are never cleaned up.

Steps to Reproduce

1. Connect to a voice channel
2. Disconnect
3. Measure the ammount of threads
4. Repeat

TheIgloo has confirmed he is able to reproduce this

...

Expected behavior: When disconnecting from a voice channel the connection's threads are cleaned up.

Actual behavior: The threads are never cleaned up, not even when calling the Garbage Collector.

Stacktrace (if applicable): [PASTEBIN or HASTEBIN link to the stacktrace]
I made a bot to test this. It is a blank bot that simply connects to a voiceChannel, disconnects, and measures the amount of threads present 10 x, then measures the amount of threads every 15 seconds.
Here is the output: http://hastebin.com/ogixonadet.py
Version affected: Current Dev build

Additional Information

TheIgloo tested this as well and he found the same thing. I have also looked at the threads with VisualVM and they are infact at the levels that are being output.

[ArsenArsen]

I am pretty sure this is not fixed. After seeing thousands of threads on FlareBot I ran the same test. It quickly went over 500 threads. Here's that threaddump http://hastebin.com/miwaxuqona.pl

Affected version: websocket-rewrite

[robot-rover]

Good so I'm not going insane then