How does the installer determine the Java installation it will use?

[rushiku]

Hi, I've downloaded the 1.14.4 Forge installer and can't get past an error.

 

Steps taken:

Install attempts:

- Download and run installer.

- Deal with installer, get to install bit, small window opens that states: "This application requires Java Runtime Environment 1.8.0".

- Close that, get sent to Oracle site to download Java 1.8

 

I do have more than one Java installation, including one that is 1.9, however

I have edited my Path to have only one Java install on it (the one in the Minecraft directory) and I have defined JAVA_HOME as that same directory.

 

java -version returns:

java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)

 

where java returns:

C:\Program Files (x86)\Minecraft\runtime\jre-x64\bin\java.exe

(it's actually defined, by me, as PROGRA~2, but Windows expanded it here)

 

So, getting back to the title, what do I need to do to help the Forge installer find the correct Java version?

[LexManos]

1.13+ installers are just jar files. So they will use whatever you have associated with the .jar extension.

You can try running https://johann.loefflmann.net/en/software/jarfix/index.html

If your path isnt setup right.

[rushiku]

This is starting to get frustrating...

I used the jarfix tool, which let me know that it updated the jar association to the Java 1.9 installation. 

The write up on the tool mentions using to the tool to avoid manually updating the registry, so I did exactly that.

(you're looking for the 'jarfile' entry, for anyone that's curious)

But still no joy.

Meanwhile, I tried entering javaw -jar forge.x.x.x.exe (and also copied it and renamed to .jar) in the command prompt, both complain about it being a corrupted jar, which it's not, because it will work if I double click on it.

 

Having run out of seemingly reasonable options, I finally gave in, uninstalled my 1.9 JDK, installed the 1.8 JRE, ran jarfix just in case, and Forge is now installing.

 

Thanks for the help!