Bukkit Server - Some plugins don't work

It appears this page covers the issue but it appears gobbledygook to me, can you make sense of it?
https://github.com/TVPT/VoxelSniper/issues/209

 

Quenton4
I have already told you multiple times. VoxelSniper is not throwing errors in the console.

 

oh so why isn't voxelsniper working still?

 

Quenton4
Please how me the error you are getting.

 

yep sorry refreshing page doesn't show your posts so sorry i'm a post behind each time so I sound really slow and stupid

[18:08:59 ERROR]: Could not load 'plugins/VoxelSniper-5.168.9-SNAPSHOT.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/thevoxelbox/voxelpacket/common/interfaces/IVoxelMessageSubscriber : Unsupported major.minor version 51.0
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]

ignore this

 

Quenton4
Is your path and classpath on your computer setup?
Also, I would like to see what your bat file looks like.

 

ok I don't know waht a classpath or path is but here is the command file (I'm on Mac):

cd ~/Desktop/BukkitServer/
java -Xmx1024M -jar craftbukkit.jar -o true

 

Quenton4
I am running windows, so I am not familiar with this. Here is the recommended code they say to put in. I don't know how much this will or will not help:

Code:

#!/bin/bash
cd "$( dirname "$0" )"
java -Xmx1024M -jar craftbukkit.jar -o true

 

ignore this

is this for mac?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Quenton4
Yes.

 

OK i'll try running it with this instead.

Same problems

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Quenton4
Here is the last thing I am going to recommend.
Try deleting all of your Java installations, for example Java 7 and Java 6, then do a clean installation of Java. This seems to be an error with Java by my research.

 

ok, how do I do that... safely?

 

Quenton4
Simple, go to where ever Mac users go to uninstall programs, and well... Uninstall it

 

HelpfulBeast Should I install java 6 and 7 or just 7?

 

Only 7

 

No that hasn't worked either... what should I do!?

 

Quenton4
Darn man, I sadly have ran out of ideas. This still, in my experiences, has something to do with Java. I hope a Mac user jumps into the conversation to help you, I don't want to leave you hanging.

 

HelpfulBeast Thanks for your help and support, appreciate it very much. I'm sure I'll find a way around it. I think someone said they upgraded their OS to Mavericks and it worked, but I'm not sure that was the same problem.

 

Quenton4
No problem man, I am always welcome. If you need help in any other posts, be sure to tag me

 

Uninstall all versions of Java you have, and then install Java 8.

 

Me4502 Are you sure that will work? Is Java 8 compatible with Bukkit?
What do you say HelpfulBeast?

 

Quenton4
Haven't looked into that, give it a shot.

 

Yes, it's compatible. It's best to install the latest, as I'm sure that very soon plugin devs are going to, for some odd reason, start using java 8 to compile.