Help building enviornment on mac

[Dizzylizard22]

Hey everyone,

 

I have always wanted to start modding minecraft but never gotten past the point of setting up an enviornment. Typically, I would try it on my desktop which is windows but right now I am using my macbook. I am using eclipse and I am attempting to mod on the latest version on minecraft 1.15.2 and I have downloaded the latest version of forge mdk. I have gone over the read me instructions multiple times I have even fully uninstalled and reinstalled java on my mac twice. Currently, from what I can tell, I am using Java 8 as its required, the version given by command prompt is 1.8.0_251 (using java -version). I have even set my java_home to point to this version of java and it was successful. 

 

When I get to the point of actually building and running the example mod provided by forge I get a NoSuchMethodError for the method rewind in ByteBuffer. I will post the whole log below but everything online says that this is because the code is compiling on a Java version later than Java 8. I have no idea how this is possible if I do not even have any other Java version on my mac. Can someone please explain to me how I could build a project on a java version that I dont even have installed? I apologize for coming here with such a basic set up question, even though it has been asked many times before on the internet. But I assure you I have followed all the tutorials I can find and many are out of date. Also, I feel like all of the forum posts I saw that said it was compiling on the wrong version never explained how to change this. I went into builder and changed the path before and just ran into more problems. I also went into compiler and pointed it to my javac for 1.8.0 and it was failing to compile due to missing variables or something.

 

Any help would be appreciated, I just want to start messing around with minecraft modding already. Thanks! 

 

**EDIT: Also, I am on macOS Catalina v 10.15.4 But I do not think that is the reason it is failing.

 

Here is the crash log..

 

Quote

// There are four lights!

Time: 4/15/20 8:50 PM
Description: Initializing game

java.lang.NoSuchMethodError: java.nio.ByteBuffer.rewind()Ljava/nio/ByteBuffer;
    at net.minecraft.client.MainWindow.loadIcon(MainWindow.java:188) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.MainWindow.setWindowIcon(MainWindow.java:152) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.<init>(Minecraft.java:380) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(Main.java:141) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_251] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_251] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_251] {}
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_251] {}
    at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.0.0-milestone.4.jar:?] {}
    at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:102) [forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {}

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
    at net.minecraft.client.MainWindow.loadIcon(MainWindow.java:188)
    at net.minecraft.client.MainWindow.setWindowIcon(MainWindow.java:152)
    at net.minecraft.client.Minecraft.<init>(Minecraft.java:380)

-- Initialization --
Details:
Stacktrace:
    at net.minecraft.client.main.Main.main(Main.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55)
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81)
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)
    at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:102)

-- System Details --
Details:
    Minecraft Version: 1.15.2
    Minecraft Version ID: 1.15.2
    Operating System: Mac OS X (x86_64) version 10.15.4
    Java Version: 1.8.0_251, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 385393384 bytes (367 MB) / 1054867456 bytes (1006 MB) up to 1908932608 bytes (1820 MB)
    CPUs: 8
    JVM Flags: 1 total; -Xss1M
    Launched Version: MOD_DEV
    Backend library: LWJGL version 3.2.1 build 12
    Backend API: Intel(R) Iris(TM) Plus Graphics 645 GL version 2.1 INTEL-14.5.22, Intel Inc.
    GL Caps: 
    Using VBOs: Yes
    Is Modded: Definitely; Client brand changed to 'forge'
    Type: Client (map_client.txt)
    CPU: <unknown>

 

Edited April 16, 2020 by Dizzylizard22

[Dizzylizard22]

This was resolved by installing Java 9. Hope this helps.