Eclipse is not able to run Minecraft

[Skaptic]

Hello

I have an issue which prevents me from doing anything related to minecraft modding.
So I installed OpenJDK, OpenJRE, Java 1.8.0-241-b07, Eclipse IDE and the Forge 1.12.2-14.23.1.2555 MDK. Then I made the JAVA_HOME path and everything else, I set up the workspace and opened Eclipse.
Now every time I try to run Minecraft in Eclipse, it just crashes before even setting the player. It is not because I have any special characters in there as I am only using the example mod and nothing else.
It doesnt even create a crash-report. Here some screenshots of my settings:
https://imgur.com/a/lzTqhDB
Log:

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2020-02-23 10:59:59,385 main WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2020-02-23 10:59:59,387 main WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[10:59:59] [main/INFO] [GradleStart]: Extra: []
[10:59:59] [main/INFO] [GradleStart]: Running with arguments: [--userProperties, {}, --assetsDir, C:/Users/Leon/.gradle/caches/minecraft/assets, --assetIndex, 1.12, --accessToken{REDACTED}, --version, 1.12.2, --tweakClass, net.minecraftforge.fml.common.launcher.FMLTweaker, --tweakClass, net.minecraftforge.gradle.tweakers.CoremodTweaker]
[10:59:59] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[10:59:59] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[10:59:59] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.CoremodTweaker
[10:59:59] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[10:59:59] [main/INFO] [FML]: Forge Mod Loader version 14.23.1.2555 for Minecraft 1.12.2 loading
[10:59:59] [main/INFO] [FML]: Java is OpenJDK 64-Bit Server VM, version 1.8.0_242, running on Windows 10:amd64:10.0, installed at C:\Program Files\AdoptOpenJDK\jdk-8.0.242.08-hotspot\jre
[10:59:59] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
[10:59:59] [main/INFO] [FML]: Ignoring missing certificate for coremod FMLCorePlugin (net.minecraftforge.fml.relauncher.FMLCorePlugin), we are in deobf and it's a forge core plugin
[10:59:59] [main/INFO] [FML]: Ignoring missing certificate for coremod FMLForgePlugin (net.minecraftforge.classloading.FMLForgePlugin), we are in deobf and it's a forge core plugin
[10:59:59] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.CoremodTweaker
[10:59:59] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.fml.relauncher.FMLCorePlugin
[10:59:59] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.classloading.FMLForgePlugin
[10:59:59] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[10:59:59] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[10:59:59] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
[10:59:59] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[10:59:59] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[10:59:59] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
Exception in thread "main" [10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]: java.lang.reflect.InvocationTargetException
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at java.lang.reflect.Method.invoke(Method.java:498)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:     at GradleStart.main(GradleStart.java:25)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: Caused by: java.lang.ExceptionInInitializerError
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.fusesource.jansi.WindowsAnsiOutputStream.<clinit>(WindowsAnsiOutputStream.java:52)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.appender.ConsoleAppender.getOutputStream(ConsoleAppender.java:263)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.appender.ConsoleAppender.getDefaultManager(ConsoleAppender.java:226)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.appender.ConsoleAppender.createDefaultAppenderForLayout(ConsoleAppender.java:172)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.config.AbstractConfiguration.setToDefault(AbstractConfiguration.java:581)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.config.DefaultConfiguration.<init>(DefaultConfiguration.java:47)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.LoggerContext.<init>(LoggerContext.java:86)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:171)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:145)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:74)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:227)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.LogManager.getContext(LogManager.java:174)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:618)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at net.minecraftforge.fml.common.FMLLog.<clinit>(FMLLog.java:43)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at net.minecraftforge.fml.common.asm.transformers.deobf.FMLDeobfuscatingRemapper.setup(FMLDeobfuscatingRemapper.java:140)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at net.minecraftforge.fml.common.asm.FMLSanityChecker.injectData(FMLSanityChecker.java:188)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:165)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[10:59:59] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:     ... 6 more
[10:59:59] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:644]: Caused by: java.lang.NullPointerException
[10:59:59] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:644]:     at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1847)
[10:59:59] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:644]:     at java.lang.Runtime.loadLibrary0(Runtime.java:871)
[10:59:59] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:644]:     at java.lang.System.loadLibrary(System.java:1124)
[10:59:59] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:644]:     at org.fusesource.hawtjni.runtime.Library.load(Library.java:325)
[10:59:59] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:644]:     at org.fusesource.hawtjni.runtime.Library.doLoad(Library.java:166)
[10:59:59] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:644]:     at org.fusesource.hawtjni.runtime.Library.load(Library.java:140)
[10:59:59] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:644]:     at org.fusesource.jansi.internal.Kernel32.<clinit>(Kernel32.java:37)
[10:59:59] [main/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:644]:     ... 30 more
OpenJDK 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

So I did everything right and it still cant run a client. Starting a server works for some strange reason and compiling the mod and starting with the normal minecraft launcher works too. The only problem I can think of is the last screenshot. There you can see the JDK being selected for JRE but from what I know those are two completely different things?
Is there anything I can do?

 

Edited February 23, 2020 by Skaptic

[Ugdhar]

1.12 is no longer supported on this forum due to age. Please update to a modern version to receive support.

 

See the LTS link at the top of every page for more information.

[Skaptic]

Its still a general issue. Im sure it wont work on 1.14 or 1.15 either but I will see.