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Forge 1.12 JAR Universal File Won't Open

Infinite_Done
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Infinite_Done Tree Puncher

Infinite_Done

Posted
Posted

Hello there!

 

So basically, anytime I try to open the "forge-1.12.2-14.23.5.2768-universal.jar" file, it always says, "The Java JAR file "forge-1.12.2-14.23.5.2768-universal.jar" could not be launched." I'm trying to start a modded server for my friends and I, but the file that creates the config files and the mod one won't open.

 

Here's my PC specs.

 

iMac (21.5-inch, Late 2015)

1.6 GHz Intel Core i5

8 GB 1867 MHz DDR3

Intel HD Graphics 6000 1536 MB

 

Thanks,

Infinite_Done.

Screen Shot 2019-06-07 at 9.37.36 PM.png

DaemonUmbra Reality Controller

DaemonUmbra

Posted
Posted

Try launching it from terminal by invoking java -jar [filename] and post the output.

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

 

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

 

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

  Reveal hidden contents

 

DaemonUmbra Reality Controller

DaemonUmbra

Posted
Posted

Well first you need to navigate the terminal to where the jar file is, please look this up yourself.

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

 

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

 

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

  Reveal hidden contents

 

Infinite_Done Tree Puncher

Infinite_Done

Posted
  • Author
Posted
  On 6/8/2019 at 2:23 AM, DaemonUmbra said:

Well first you need to navigate the terminal to where the jar file is, please look this up yourself.

Expand  

As I said in my second comment, I put it into the Terminal and it said

 

"Error: Unable to access jarfile forge-1.12.2-14.23.5.2768-universal.jar"

DaemonUmbra Reality Controller

DaemonUmbra

Posted
Posted

Please provide a screenshot of your terminal window

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

 

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

 

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

  Reveal hidden contents

 

DaemonUmbra Reality Controller

DaemonUmbra

Posted
Posted

What do you get from the ls command?

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

 

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

 

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

  Reveal hidden contents

 

DaemonUmbra Reality Controller

DaemonUmbra

Posted
Posted

According to the image you cd-ed to your desktop but not into that folder

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

 

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

 

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

  Reveal hidden contents

 

Infinite_Done Tree Puncher

Infinite_Done

Posted
  • Author
Posted

Oh, for some reason though I can't cd into the folder. It's called "please work ree." How would I be able to do that?

 

Sorry if I'm being dumb, it's been a frustrating few hours trying to figure this out.

Infinite_Done Tree Puncher

Infinite_Done

Posted
  • Author
Posted

So I figured out how to get to the folder with terminal. Once I did that and attempted to run the jar file, it says

 

A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.base/java.lang.reflect.Method.invoke(Method.java:567)

at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)

at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)

Caused by: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')

at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

... 6 more

DaemonUmbra Reality Controller

DaemonUmbra

Posted
Posted

Forge for 1.12.2 and earlier only works with Java 8, your computer is trying to use Java 9 or later

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

 

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

 

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

  Reveal hidden contents

 

DaemonUmbra Reality Controller

DaemonUmbra

Posted
Posted

https://adoptopenjdk.net

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

 

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

 

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

  Reveal hidden contents

 

DaemonUmbra Reality Controller

DaemonUmbra

Posted
Posted

Yes

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

 

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

 

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

  Reveal hidden contents

 

  • 6 months later...
Silas_N Tree Puncher

Silas_N

Posted
Posted

Hey I've been having the same issue as Infinite_Done, and I'm trying the same thing, but I don't know how to use this OpenJDK 8 to open the forge.*.universal.jar file. Can you let me know how to do this? It seems like it's still using the default jar launcher, and I don't know where to find it if I open it with other. When I navigated around my computer, I did find a folder titled adoptopenJDK8 or something to that extent, but none of it's contents could be used to launch the jar file. :/ 

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