This happens when trying to load Minecraft

[DTRaptor]

Hi, I'm back. I need help with this problem that shows up whenever I try to test my mod.

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by GradleStart (file:/C:/Users/*/.gradle/caches/minecraft/net/minecraftforge/forge/1.12.2-14.23.5.2768/start/) to field java.lang.ClassLoader.sys_paths
WARNING: Please consider reporting this to the maintainers of GradleStart
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[17:17:55] [main/INFO]: Extra: []
Exception in thread "main" 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.minecraftforge.gradle.GradleForgeHacks.searchCoremods(GradleForgeHacks.java:85)
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:86)
	at GradleStart.main(GradleStart.java:25)

What does this mean? How can I fix it? I am using Java 11 for the 1.12.2 mod and I am using Intellij Idea

[Cadiboo]

Only Java 8 is supported for 1.12.2

[Last_penguin]

On 6/13/2019 at 3:01 PM, Cadiboo said:

Only Java 8 is supported for 1.12.2

Im using java 8 and want to create mod for minecraft 1.12.2 but i have this error too

[Last_penguin]

I fixed it, I just changed this