Hi there,
I have been looking around for a way to start modding on a Technic SSP, Minecraft version 1.2.5. What I would aim at is to make those big Rubber Trees from RedPower 2 spawn in clusters in normal forests just like they used to in even older versions rather than getting them to spawn singularly and quite far away from each other in the jungles. I would likely be able to handle the code all by myself, even though I have never been modding MC at all, I have a somewhat valuable java knowledge although I might be kind of rusty right now, and I got used to immediately understand this kind of APIs through spigot plugins development, which I've been doing for more than a year, before actually quitting minecraft.

Now, as many of you might already have in mind, 1.2.5 is a highly outdated version that nobody would recommend to neither look for mods of nor to start modding at all, but I really only mind this about my return to minecraft: playing my old days modpacks that I really loved, all on my own. So I wouldn't take anything about updating my game as a solution, I legit don't want to play with anything new of Minecraft, I want my game version to be 1.2.5!

Now, forge's SRC files (yup, there was no Mdk and no gradle back then) are still avaliable for download for mc version 1.2.5, and I already got them.
What you had to do was to extract them inside your MCP (Minecraft Coder Pack) folder, and you also had to move your clean minecraft_server.jar, bin and resources files(folders) inside the jars folder from MCP. I already managed to get myself those files, and I will link you my sources, since they might be known for unreliability in this specific matter or there might be some better copies that you guys know about or own yourselves.
minecraft_server.jar (seemingly very reliable):
  forum: https://www.minecraftforum.net/forums/support/server-support-and/1872947-minecraft-1-2-5-server-jar

  link that i picked (second reply, second link in list labelled "minecraft 1.2.5 server jar"): http://assets.minecraft.net/1_2_5/minecraft_server.jar
bin and resources, .minecraft folder without META-INF folder (which I needed to remove so that was fine):
  YT link: https://www.youtube.com/watch?v=1m92hoZH4Iw

  download link: https://www.youtube.com/redirect?redir_token=rj43zHJV1MhwKy37zYV9oQ7ha6Z8MTU0MDM5NjIzMUAxNTQwMzA5ODMx&event=video_description&v=1m92hoZH4Iw&q=http%3A%2F%2Fwww.mediafire.com%2F%3F1m2j4352e683167

About this .minecraft, I wouldn't know if that's fine to use, and I could download 1.2.5 files from mc's official launcher, but that wouldn't organize them in a bin and resources folder, since it's a little more optimized now and you're not required to have a fully different .minecraft folder in order to play a specific version.

About that bin folder, you also had to install in that minecraft.jar file the Modloader files.
Src: http://www.mediafire.com/file/lnycj6148bf33zs/Modloader+1.2.5.zip

 

As a last thing, hoping that I didn't forget anything, you also had to put fernflower.jar in the *mcp*\runtime\bin folder, and the way that I got that .jar was simply by grabbing a newer version of mcp (since, after a couple of updates, that file was already included in the directory that i pointed out) and taking the file from its runtime's bin folder.

With all of this said, let's jump to the issue that I'm running into.

 

After you did all the things listed above correctly, you should run install.cmd, in your forge folder inside mcp; running it is seemingly fine, but at a certain point I encounter a ClassNotFoundException, where the missing class should be "axe" (?):
 

> Applying Retroguard
'"C:\Program Files\Java\jdk-9.0.1\bin\java" -cp "runtime\bin\retroguard.jar;lib;lib\*;jars\bin\minecr...' failed : 1

== ERRORS FOUND ==

Unrecoverable error during obfuscation, see log file for details.
RetroGuard error: COM.rl.obf.classfile.ClassFileException: ClassNotFound axe
==================

Decompile failed
Decompile Exception: 1

This is an error that I didn't usually run into though, I created another fresh mcp folder since I kept on running into weird and deep exceptions, so I preferred to start back from 0, but now this error occurs during the first phase of the setup, it won't really take too long to see it appearing. I'd rather not going back to my first mcp folder, and trying to find solutions to any error I run into on this new one, just to have a clean look at the whole situation rather than going onto something that I had already started which was also quite messy since I had been even running into different kind of errors throughout my discovery on what I had to do about the bin and resources folder and about the minecraft_server.jar and fernflower.jar files.
 

I'm really clueless on how I should react to any errors right now, and I also feel like I didn't pay enough attention into writing down this post, this is the reason why I hope that you could point me out if I missed anything important to mention.

Any help will be appreciated!

@Vert3x I'm sorry but that version isn't supported here because of its age. No one on here is going to remember how to set it up or even mod for it.

Sorry we don't support 1.2.5 (or any version below 1.9) on this forum anymore due to its age (4+ years old). We simply don't know how to help you anymore. You can go to the Minecraft Forum where I think that they still still support older versions, or update to a modern version of Minecraft (the latest version or the one before it) to receive support on this forum. Your problem might be related to the fact that you need to use Java 8.

37 minutes ago, Cadiboo said:

Your problem might be related to the fact that you need to use Java 8.

It's probably java 6 as that's really old, but it might be java 7. Definitely not 8.

7 hours ago, Animefan8888 said:

that version isn't supported here because of its age.