When starting Forge 1.8 (in Eclipse) I got the error "Unrecognized argument: -Xincgc" or something like that. I then removed that in the Run Configurations. Now comes this mistake
[21:31:19] [main / INFO] [GradleStart]: Extra: []
Exception in thread "main" java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders $ AppClassLoader can't 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.minecraftforge.gradle.GradleForgeHacks.searchCoremods (Unknown Source)
at net.minecraftforge.gradle.GradleStartCommon.launch (Unknown Source)
at GradleStart.main (Unknown Source)
(JavaSE-1.7, jdk13.0.1)
JavaSE-1.7, jdk13.0.1
What does this mean? Why 1.7?
Since Java 8 is apparently still common on Minecraft and you will probably be overwhelmed with different configurations, I would recommend that you remove all JDKs except one 8 to get started.
This eliminates a source of error.
Before the question arises: you can get a JDK 8 at AdoptOpenJDK or as Amazon Corretto.
I've tried JDK 8 before. Then I looked at another tutorial that worked fine with JDK 7
That doesn't make much sense. You run it on JDK 13, but also with the age-old 7? This mix only complicates everything, especially if you only seem to know your way around very superficially.
Sorry, was very confused, the JDK hadn't changed at all. At 7 it works now. It's only 1.8 Forge, that's why it still works.
