private MinecraftServer server;

    @SubscribeEvent
    public void onServerStarting(FMLServerStartingEvent event) {
        // do something when the server starts
        LOGGER.info("HELLO from server starting");
        server = event.getServer();
    }

    @SubscribeEvent
    public void onChat(ClientChatEvent event){
        final String message = event.getMessage();
        if (message.equals("test")) {
            LOGGER.info("Running test code");
            server.getWorld(DimensionType.OVERWORLD).setBlockState(new BlockPos(50, 50, 100), Blocks.DIAMOND_BLOCK.getDefaultState());
        }
    }

 

If the player says a certain phrase, I want a single block to change.

 

Seems like a very simple task, but unfortunately this has no effect. I do see "Running test code" in the console, so I know it's getting to that point.

Edited May 22, 20205 yr by foul_owl

Thank you! My code now looks like this:

private MinecraftServer server;

    @SubscribeEvent
    public void onServerStarting(FMLServerStartingEvent event) {
        // do something when the server starts
        LOGGER.info("HELLO from server starting");
        server = event.getServer();
    }

    @SubscribeEvent
    public void onChat(ServerChatEvent event){
        final String message = event.getMessage();
        if (message.equals("test")) {
            LOGGER.info("Running test code");
            server.getWorld(DimensionType.OVERWORLD).setBlockState(new BlockPos(50, 50, 100), Blocks.DIAMOND_BLOCK.getDefaultState());
        }
    }

 

Unfortunately same issue here. I can see the logger output "Running test code" but the block does not change.

 

Thank you so much for the help!

Edited May 21, 20205 yr by foul_owl

Understood, thank you.

 

I found this post:

https://www.minecraftforge.net/forum/topic/82415-how-to-get-current-world-so-i-can-use-setblockstate-1152/

Which seems close to what I want to accomplish, so I tried:

 

    @SubscribeEvent
    public void onChat(ServerChatEvent event){
        final String message = event.getMessage();

        World world = DimensionManager.getWorld(event.getPlayer().getServer(), DimensionType.OVERWORLD, true, true);

        if (message.equals("test")) {
            LOGGER.info("Running test code");
            world.setBlockState(new BlockPos(50, 50, 100), Blocks.DIAMOND_BLOCK.getDefaultState());
        }
    }

 

Same issue, no effect. So then I figured maybe I am complicating things with the dimension manager, so I also tried:

 

    @SubscribeEvent
    public void onChat(ServerChatEvent event){
        final String message = event.getMessage();

        World world = event.getPlayer().getServer().getWorld(DimensionType.OVERWORLD);

        if (message.equals("test")) {
            LOGGER.info("Running test code");
            world.setBlockState(new BlockPos(50, 50, 100), Blocks.DIAMOND_BLOCK.getDefaultState());
        }
    }

 

Same issue. I see "Running test code" but the block does not change. I'm sorry, I really don't know what I'm doing wrong.

 

Thank you so much for all the help.

Tried one more thing for the hell of it. Skipped the "world" variable entirely:

 

    @SubscribeEvent
    public void onChat(ServerChatEvent event){
        final String message = event.getMessage();
        if (message.equals("test")) {
            LOGGER.info("Running test code");
            event.getPlayer().getServer().getWorld(DimensionType.OVERWORLD).setBlockState(new BlockPos(50, 50, 100), Blocks.DIAMOND_BLOCK.getDefaultState());
        }
    }

 

Same thing, I get the logger output but no effect.

I saw the "getServerWorld()" method from poking around and tried:

 

    @SubscribeEvent
    public void onChat(ServerChatEvent event){
        final String message = event.getMessage();

        if (message.equals("test")) {
            LOGGER.info("Running test code");
            event.getPlayer().getServerWorld().setBlockState(new BlockPos(50, 50, 100), Blocks.DIAMOND_BLOCK.getDefaultState());
        }
    }

 

Again, same issue. I get the logger output but no effect.

1 hour ago, foul_owl said:

event.getPlayer().getServer()

uh... event.getPlayer().getEntityWorld()?

3 minutes ago, Draco18s said:

uh... event.getPlayer().getEntityWorld()?

Thank you! Unfortunately, no effect. Same output as before.

 

My code:

   @SubscribeEvent
    public void onChat(ServerChatEvent event){
        final String message = event.getMessage();

        if (message.equals("test")) {
            LOGGER.info("Running test code");
            event.getPlayer().getEntityWorld().setBlockState(new BlockPos(50, 50, 100), Blocks.DIAMOND_BLOCK.getDefaultState());
        }
    }

 

22 minutes ago, diesieben07 said:

Use the debugger, from looking at the code that should work fine.

Thank you! Which iteration of my code? The last attempt?

I did getBlockState() and set a breakpoint to examine the contents.

 

It's definitely a diamond block, but it appears, visually, to the player as a block of air.

 

Is there some sort of refresh that has to happen after a setBlockState() is called?

Here is my code:

    @SubscribeEvent
    public void onChat(ServerChatEvent event){
        final String message = event.getMessage();
        World world = event.getPlayer().getServer().getWorld(DimensionType.OVERWORLD);
        if (message.equals("get")) {
            LOGGER.info("Running get code");
            BlockState tmpstate;
            tmpstate = world.getBlockState(new BlockPos(50, 50, 100));
            LOGGER.info("End of get code");
        }
        else if (message.equals("set")) {
            LOGGER.info("Running test code");
            world.setBlockState(new BlockPos(50, 50, 100), Blocks.DIAMOND_BLOCK.getDefaultState());
        }
    }

Breakpoint is set at the end of the "get" block.

Ok, I figured out what the issue is here. The world I have been testing with was in a bugged state.

 

It appears it is possible for the world to get into a bugged state where "getBlockState" shows the block as being one block type, where the player visually sees the block as a different block type.

 

I even tried filling in the area with other blocks, and my "get" code still showed the block state as being diamond.

 

Deleting the world and creating a new one resolved the issue. I didn't try this originally as a build takes ~2 minutes, and generating a world is an additional ~2 minutes. (Even 2 minutes is a long time to wait for a build for me, my C++ projects usually take seconds to build ?)

 

I should have tried a new world sooner, but I simply did not expect a world to get into a state where:

• setBlockState has no effect.
• getBlockState does not match the block shown on screen.
• Replacing the block at the coordinates does not match the block type of "getBlockState".

Very strange bug.

 

(Yes, I confirmed my location each time both with "/teleport 50 50 100" and with F3.)

 

In any case, happy to have this issue resolved.

Edited May 22, 20205 yr by foul_owl