Question Help with dev env on Linux (Xubuntu)

Code (Text):

1. 23:25:24 [INFO ] [            RuneMate] Setting up new logger for development_toolkit_maini
2. Exception in thread "139075 - Development Toolkit" java.lang.ExceptionInInitializerError
3.     at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
4.     at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
5.     at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
6.     at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
7.     at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
8.     at nul.iiIIiIiiiIiIiI.iiIiIIiiiIiIiI(nu:290)
9.     at nul.iIIIIIiiiIiIIi.IiIiIiiiIiIIiI(zv:573)
10.     at nul.iiIIiIiiiIiiiI.iiIIIiiiIIIiIi(yq:357)
11.     at nul.iiIiiIiiiiiIii.iiIIIiiiIIiIII(yq:538)
12.     at nul.iiIiiIiiiiiIii.run(yq:171)
13. Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make java.lang.reflect.Method(java.lang.Class,java.lang.String,java.lang.Class[],java.lang.Class,java.lang.Class[],int,int,java.lang.String,byte[],byte[],byte[]) accessible: module java.base does not "opens java.lang.reflect" to unnamed module @987a5e8
14.     at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
15.     at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
16.     at java.base/java.lang.reflect.Constructor.checkCanSetAccessible(Constructor.java:188)
17.     at java.base/java.lang.reflect.Constructor.setAccessible(Constructor.java:181)
18.     at com.runemate.bots.dev.DevelopmentToolkit.break(rm.entrypoint:297)
19.     at com.runemate.bots.dev.DevelopmentToolkit.<clinit>(rm.entrypoint:160)
20.     ... 10 more

- Dev Client boots up ok
- Runelite boots up ok
- Devtool bot gets stuck at 50%
- Runemate installed via the shell script, not standalone .jar
- JDK: Eclipse Temurin version 17.0.8

Any ideas? No tutorials on linux dev envs, and even the windows ones are heavily outdated.