Request FTB crashes at launch for 1.6.4

[ProbablyNotACat]

I have been trying to run a server using the direwolf20 pack, v1.0.23 with minecraft 1.6.4.
every time i launch it simply crashes, i've gotten a log error saying [severe][forgemodloader] unable to launch. I've tried running java 7 & 8 with no success. any help would be appreciated
here's the whole log
http://pastebin.com/NkJADZ3r

 

[Wagon153]

Uninstall Java 8 completely, then try.

 

[TehSweaterVest]

this may be obvious but just in case do we install java 8 again ????

 

[Wagon153]

this may be obvious but just in case do we install java 8 again ????

No. Only use Java 7.

 

[TehSweaterVest]

how do i install jav 7 i cant find it on the java website???

 

[Wagon153]

http://www.oracle.com/technetwork/java/javase/downloads/index.html
Also, you only need one question mark.

 

[ProbablyNotACat]

Awesome, thanks so much. I didn't realize that installing java 7 didn't automatically uninstall java 8

 

[AgentPaint]

No. Only use Java 7.

Why can we not use Java 8? Is something wrong with it?

 

[Wagon153]

Why can we not use Java 8? Is something wrong with it?

Forge relied on a bug that was fixed in Java 8u20+. It's fixed in 1.7 builds of Forge.

 

[AgentPaint]

Forge relied on a bug that was fixed in Java 8u20+. It's fixed in 1.7 builds of Forge.

Hmm, how unfortunate. I hope the modpacks update soon. I use Java 8 because it slightly improves performance in Minecraft.

 

[Elessar]

Reddit post on the matter.

There was only one classfile that needed the fix, and while it was fixed in later versions of 1.7.10 forge, someone made their own modified classfile to be able to patch it manually in 1.6.4 forge (see link).

 

[AliceTheVixen]

I found this out the hard way myself. I had an outdated Java and updated too far. Found that I needed to drop back a version, and now I'm sitting at J7u25. I don't notice much of a performance change, but I so haven't been able to use J8 yet.

 

[Wagon153]

I found this out the hard way myself. I had an outdated Java and updated too far. Found that I needed to drop back a version, and now I'm sitting at J7u25. I don't notice much of a performance change, but I so haven't been able to use J8 yet.

Java 8 is almost a requirement for good performance in 1.8.
Reddit post on the matter: http://www.reddit.com/r/Minecraft/comments/2js5j3/the_creator_of_optifine_sp614x_explains_the_18/

 

[AliceTheVixen]

Oh.. Well there's my problem. I find mods so enjoyable, that I am unable to any Vanilla. On top of that, so many of my favorite mods are locked in 1.6.4, that I don't think I've ventured beyond 1.7.1.