CoreMod | Display system information of the Intel Core Processor

Here's the problem:

It seems the Minecraft code you are using depends on the Nashorn scripting engine. Nashorn was removed from the JDK in Java 15, which it seems you are running.

Downgrade to JDK 14 or an earlier version.

First of all, you should not be keeping your data inside the controller because the controller runs anew each time it is called and your data will be lost. Use a database for best results.

Your syntax for calling the modal is slightly wrong. Check here for the correct syntax. It's not href (that's your mistake!) You can mostly copy this code and replace the inner parts with what you have.

https://getbootstrap.com/docs/4.0/components/modal/

*Note: you must be using bootstrap for this to work

Good Luck!

Edit : You can try this: (may need some tweaking)

This looks like a certain compatibility issue with Java 8u242 that hasn't yet been resolved. For now, the best workaround is to downgrade to Java 8u232.

An aside about obfuscated names

Minecraft has 3 levels of naming:

1. Notch Names - these are the names of methods and fields that Minecraft uses when distributed. Often things like a.aa and b.cf2. This is the fully obfuscated state
2. SRG Names - these are the names given to methods and fields by the runtime deobfuscation process that Forge performs when you run the game. Compiled mods use these names, as they are consistent across minor versions
3. MCP Names - these are the human readable names you see inside Eclipse. These names are supplied by hand when someone figures out what a field or method does via the MCP Bot on IRC. Installing the Forge development environment with the MDK grabs the "current" mappings when you run gradlew setup

In order to run a mod in the development environment you need to deobfuscate it first, changing SRG names into MCP names, so that it can run in the development environment.

There are a couple ways of doing this:

1. Acquire a "sources" jar from the mod's author (subject to the whims of the author; may or may not be public or open source, have an API, etc. etc.)
2. Use Code Chicken Core to perform a runtime deobf in Eclipse (may or may not work; note: you want the sources jar)
3. Using a tool like BON2 (never used it, should work)
4. use Gradle to deobfuscate the mod (should always work)

The problem with option 4 here, is that while I know it's possible I can't (and haven't been able to for some time) find the necessary instructions. The things I can find now, posted by people who would know how to do 4 are suggesting doing 3.

args is for your program arguments, use jvmArgs instead

The problem is in your Variables class