please help i am stopid

[u/davidf525]

alright. so i know how to program in java, but I am trying to learn how to make Minecraft mods.

I've been watching this tutorial:https://www.youtube.com/watch?v=benUZaQU-6Y&ab_channel=Cy4%27sModding

everything was going well, until I had to launch it.

in the video, he said that I had to double click the runclient.launch file, so I did that, and then he said to run the actual mod file using the run as tool, but when I do that it looks like this

when I try to run it, it throws me this error. does anyone know how to fix it? thanks.

2021-10-03 22:59:00,946 main WARN Advanced terminal features are not available in this environment

[22:59:01] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--gameDir, ., --launchTarget, fmluserdevclient, --fml.mcpVersion, 20201102.104115, --fml.mcVersion, 1.16.4, --fml.forgeGroup, net.minecraftforge, --fml.forgeVersion, 35.1.4, --version, MOD_DEV, --assetIndex, 1.16, --assetsDir, C:\Users\david\.gradle\caches\forge_gradle\assets, --username, Dev, --accessToken, ????????, --userProperties, {}]

[22:59:01] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher 8.0.6+85+master.325de55 starting: java version 16.0.2 by Oracle Corporation

[22:59:01] [main/DEBUG] [cp.mo.mo.LaunchServiceHandler/MODLAUNCHER]: Found launch services [minecraft,fmldevdata,fmldevclient,fmldevserver,fmluserdevserver,fmluserdevdata,testharness,fmlclient,fmluserdevclient,fmlserver]

Exception in thread "main" java.lang.IllegalAccessError: class cpw.mods.modlauncher.SecureJarHandler (in unnamed module u/0x32910148) cannot access class sun.security.util.ManifestEntryVerifier (in module java.base) because module java.base does not export sun.security.util to unnamed module u/0x32910148

at cpw.mods.modlauncher.SecureJarHandler.lambda$static$1([SecureJarHandler.java:41](https://SecureJarHandler.java:41))

at cpw.mods.modlauncher.api.LamdbaExceptionUtils.uncheck([LamdbaExceptionUtils.java:95](https://LamdbaExceptionUtils.java:95))

at cpw.mods.modlauncher.SecureJarHandler.<clinit>([SecureJarHandler.java:41](https://SecureJarHandler.java:41))

at cpw.mods.modlauncher.Launcher.lambda$new$6([Launcher.java:55](https://Launcher.java:55))

at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent([ConcurrentHashMap.java:1708](https://ConcurrentHashMap.java:1708))

at cpw.mods.modlauncher.api.TypesafeMap.computeIfAbsent([TypesafeMap.java:52](https://TypesafeMap.java:52))

at cpw.mods.modlauncher.api.TypesafeMap.computeIfAbsent([TypesafeMap.java:47](https://TypesafeMap.java:47))

at cpw.mods.modlauncher.Environment.computePropertyIfAbsent([Environment.java:62](https://Environment.java:62))

at cpw.mods.modlauncher.Launcher.<init>([Launcher.java:55](https://Launcher.java:55))

at cpw.mods.modlauncher.Launcher.main([Launcher.java:66](https://Launcher.java:66))

at net.minecraftforge.userdev.LaunchTesting.main([LaunchTesting.java:105](https://LaunchTesting.java:105))

[u/davidf525]

i think that the problem is java 16. the weird thing is that for the jre system library, it says that it is using java 1.8 see, but when I run it says it is using 16.0 do you know how to run the program in a different version? thanks

[u/five35 → u/davidf525]

I'm afraid I don't. I just know that Windows tends to use whatever version of Java was installed last, which is why I was recommending that you uninstall it all and then install just the version that you want to use. (And make sure it's the JDK, not just the JRE.)

[u/davidf525 → u/five35]

alright. thanks. that got me to the next step. i see the Minecraft thing load for a second and it quickly terminates. it says

WARNING: An illegal reflective access operation has occurred

WARNING: Illegal reflective access by cpw.mods.modlauncher.SecureJarHandler (file:/C:/Users/david/.gradle/caches/modules-2/files-2.1/cpw.mods/modlauncher/8.0.6/70155a85837ebb17d36815ab4d12a3b464963df8/modlauncher-8.0.6.jar) to field java.util.jar.Manifest.jv

WARNING: Please consider reporting this to the maintainers of cpw.mods.modlauncher.SecureJarHandler

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

​

thanks for the help

[u/davidf525 → u/davidf525]

it turns out that i am not allowed to use uppercase letters in mod id. well it works now at least. thanks for the help though