Java Development Kit with Minecraft 1.8.9 Forge Modding, What JDK/JRE Is Needed, Is Code Correct?

Question

I was following Powns' tutorial

https://www.youtube.com/watch?v=keDj9fvzigk

on how to make mods in Minecraft 1.8.9 Forge.

I did the exact same thing as him but when I ran it, it did not work. This has lead me to believe that it has to do with my JDK version. Except, he does not say which one he uses, what version should I use?

I have tried using the newest version and it does not work, I'm using 8u5 currently.

My code for the counter is

package me.BeastModeGamez.arrowCounter;

import net.minecraft.init.Blocks;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.Mod.EventHandler;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;

@Mod(modid = ArrowCounter.MODID, version = ArrowCounter.VERSION)
public class ArrowCounter
{
    public static final String MODID = "arrowCounter";
    public static final String VERSION = "1.0";

    @EventHandler
    public void init(FMLInitializationEvent event)
    {


    }
}

My code for the counterCommands is

package me.BeastModeGamez.arrowCounter.commands;

import net.minecraft.command.CommandBase;
import net.minecraft.command.CommandException;
import net.minecraft.command.ICommandSender;
import net.minecraft.util.ChatComponentText;

public class arrowCounterCommands extends CommandBase {

    @Override
    public String getCommandName() {
    return "arrowcounter";
    }

    @Override
    public String getCommandUsage(ICommandSender sender) {
        return "/" + getCommandName();
    }

    @Override
    public void processCommand(ICommandSender sender, String[] args) throws CommandException {
        sender.addChatMessage(new ChatComponentText("Test Command."));

    }

    @Override
    public int getRequiredPermissionLevel() {
        return 0;
    }

    @Override
    public boolean canCommandSenderUseCommand(final ICommandSender p_71519_1_) {
    return true;
    }

}

I hope to see the mod work, but instead it says unknown command. Something that I believe to be important are two warnings saying:

Description Resource Path Location Type The compiler compliance specified is 1.6 but a JRE 1.8 is used .org.eclipse.jdt.core.external.folders Compiler Compliance JRE Compiler Compliance Problem

and also

Description Resource Path Location Type The compiler compliance specified is 1.6 but a JRE 1.8 is used MDKExample Compiler Compliance JRE Compiler Compliance Problem

Also, in case you are wondering if the code won't work anymore, the video was made 3 weeks ago.

So, in conclusion, my question is: what is needed to fix this, and does it have to do with the JRE as it says in the warnings, or is my code incorrect, or do I need a newer JDK? And if I do have to change the JRE, how?

Edit: I have fixed both errors (and changed the jdk to an updated one) meaning it is most likely not software but instead, code, the error is now (not in problems - not shown) that every time I try to run the command it says unknown command.

Have you got multiple versions of java installed ? What is minecraft version you are using ? — Rmahajan, Jan 13 '19 at 17:22
I have the newest JDK installed and also 8u5 and the JREs I have are... — BeastCoder, Jan 13 '19 at 17:23
Which IDE you are using ? Please set your compiler to 1.8. You IDE have 1.6 set for compilation. — Rmahajan, Jan 13 '19 at 17:35
Please go and check Preferences -> search for Compiler. What is specified over there — Rmahajan, Jan 13 '19 at 17:37
And how to I get to preferences, for example is it File > Prefrences, or what? — BeastCoder, Jan 13 '19 at 17:38
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/186628/discussion-between-rohit-mahajan-and-beastcoder). — Rmahajan, Jan 13 '19 at 17:39

score 3 · Answer 1 · edited Jun 20 '20 at 09:12

3

You need Java 8

If you have more than one JDK installed you'll need to insure that Eclipse is pointed to the right one, but unless you're doing other Java development, you could just uninstall the other JDKs and install only the one you need. See this thread. Its often easier to just have the right version of the JDK than to use a newer one and target an older specification.

For reference, Minecraft 1.13 targets Java 9 and the Forge launcher is having to be rewritten to support that (see this thread).

However it looks like you have Eclipse set to target the Java 6 runtime, regardless of what JDK you have, and that's what's being complained about. See this question to resolve that.

edited Jun 20 '20 at 09:12

Community

1
1

answered Jan 14 '19 at 14:25

Draco18s no longer trusts SE

15,628
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Aside from this, is there anything wrong with the code? Because I think I do actually have java 8. – BeastCoder Jan 14 '19 at 16:24
Whatever code is throwing that first error isn't in the code you posted. I don't even know what to look for on the second. – Draco18s no longer trusts SE Jan 14 '19 at 18:22
Alright, so I have changed the JRE that was selected to a JDK and it still doesnt work. – BeastCoder Jan 14 '19 at 20:29
*`I have fixed both errors [...] so what is the error?`* If you have no errors, then what's the problem? – Draco18s no longer trusts SE Jan 14 '19 at 21:38
Every time I run the command it says it is a unknown command. – BeastCoder Jan 14 '19 at 22:03
You haven't registered your command. You have a class for it, but you never point Minecraft *at* that class. – Draco18s no longer trusts SE Jan 15 '19 at 02:14
Could you please explain how to do that. – BeastCoder Jan 15 '19 at 02:27
1

In your main mod class. – Draco18s no longer trusts SE Jan 15 '19 at 14:15
Where is my main mod class? – BeastCoder Sep 15 '19 at 13:29
You need to register things in the appropriate method for registering things. So, the FMLPreInitializationEvent for 1.8.9. – Draco18s no longer trusts SE Sep 15 '19 at 15:33
do you have a video that explains this – BeastCoder Sep 15 '19 at 15:47
No, but I have [documentation](https://mcforge.readthedocs.io/en/latest/gettingstarted/structuring/#what-is-mod). – Draco18s no longer trusts SE Sep 15 '19 at 16:10

Java Development Kit with Minecraft 1.8.9 Forge Modding, What JDK/JRE Is Needed, Is Code Correct?

1 Answers1

You need Java 8