[1.8.9] NPE while reading Schematics

Posted March 5, 20169 yr

Hello everyone,

I am triing to code my own Schematic creator. I already got a working Schematic reader that works like a charm.

The problem is that when I try to read my own schematics I get an NPE for the InflaterInputStream, and I have no idea why.

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: java.lang.NullPointerException

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at java.util.zip.InflaterInputStream.<init>(Unknown Source)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at java.util.zip.GZIPInputStream.<init>(Unknown Source)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at net.minecraft.nbt.CompressedStreamTools.readCompressed(CompressedStreamTools.java:28)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at de.busybeever.extendedvillages.schematics.Schematic.<init>(Schematic.java:31)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at de.busybeever.extendedvillages.village.ServerVillage.<init>(ServerVillage.java:37)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at de.busybeever.extendedvillages.networking.PacketCreateVillage$Handler.onMessage(PacketCreateVillage.java:46)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at net.minecraftforge.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.channelRead0(SimpleChannelHandlerWrapper.java:37)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at net.minecraftforge.fml.common.network.internal.FMLProxyPacket.processPacket(FMLProxyPacket.java:90)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at net.minecraft.network.NetworkManager.channelRead0(NetworkManager.java:158)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at net.minecraft.network.NetworkManager.channelRead0(NetworkManager.java:54)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.handleServerSideCustomPacket(NetworkDispatcher.java:428)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.local.LocalChannel.finishPeerRead(LocalChannel.java:326)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.local.LocalChannel.access$400(LocalChannel.java:45)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.local.LocalChannel$5.run(LocalChannel.java:312)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:380)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)

[14:43:22] [Netty Server IO #1/INFO] [sTDERR]: [de.busybeever.extendedvillages.schematics.Schematic:<init>:59]: at java.lang.Thread.run(Unknown Source)

[14:43:22] [Netty Server IO #1/ERROR] [FML]: SimpleChannelHandlerWrapper exception

Here is my code for creating the schematic

private boolean createSchematic(String path, BlockPos first, BlockPos second, World world) {
	try {
		int smallerY, smallerX, smallerZ;
		int biggerY, biggerX, biggerZ;

		if(first.getX()>second.getX()) {
			smallerX= second.getX();
			biggerX = first.getX();
		}
		else {
			smallerX = first.getX();
			biggerX = second.getX();
		}
		if(first.getY()>second.getY()) {
			smallerY= second.getY();
			biggerY = first.getY();
		}
		else {
			smallerY = first.getY();
			biggerY = second.getY();
		}
		if(first.getZ()>second.getZ()) {
			smallerZ= second.getZ();
			biggerZ = first.getZ();
		}
		else {
			smallerZ = first.getZ();
			biggerZ = second.getZ();
		}

		NBTTagCompound compound = new NBTTagCompound();
		int width = biggerX-smallerX+1;
		int height = biggerY-smallerY+1;
		int length = biggerZ-smallerZ+1;
		compound.setInteger("Width", width);
		compound.setInteger("Height", height);
		compound.setInteger("Length", length);



		byte[] blockIDS = new byte[width*height*length];
		byte[] metadata = new byte[width*height*length];

		int counter=0;



		for(int y=smallerY; y<=biggerY;y++) {
			for (int z = smallerZ; z <= biggerZ; z++) {
				for (int x = smallerX; x <= biggerX; x++) {
					IBlockState state = world.getBlockState(new BlockPos(x,y,z));
					blockIDS[counter] = (byte) Block.getIdFromBlock(state.getBlock());
					metadata[counter] = (byte) state.getBlock().getMetaFromState(state);
					counter++;
				}
			}
		}
		compound.setByteArray("Blocks", blockIDS);
		compound.setByteArray("Data", metadata);
		FileOutputStream fos = new FileOutputStream(path);
		CompressedStreamTools.writeCompressed(compound, fos);
		fos.close();

		return true;
	} catch (FileNotFoundException e) {
		e.printStackTrace();
		return false;
	} catch (IOException e) {
		e.printStackTrace();
		return false;
	}




}

And for creating the schematic

public Schematic(String name) { 
	try {
		InputStream is = Schematic.class.getResourceAsStream("/assets/extendedvillages/schematics/"+name+".schematic");
		NBTTagCompound compound = CompressedStreamTools.readCompressed(is);
		is.close();
		width = compound.getShort("Width"); //This is where it crashes
		height = compound.getShort("Height");
		length = compound.getShort("Length");
		blocks = new BlockInf[width*height*length];

		byte[] blockIDS = compound.getByteArray("Blocks");
		byte[] metadata = compound.getByteArray("Data");
		int counter=0;
		for (int y = 0; y < height; y++) {
			for (int z = 0; z < length; z++) {
				for (int x = 0; x < width; x++) {
					BlockPos pos = new BlockPos(x,y,z);
					IBlockState state = Block.getBlockById(blockIDS[counter]!=-92?blockIDS[counter] : 53).getStateFromMeta(metadata[counter]);

					counter++;
					blocks[counter] = new BlockInf(pos, state);
					System.out.println(blocks[counter]);

				}
			}

		}


	}
	catch(Exception e) {
		e.printStackTrace();
	}
}

Quote

March 5, 20169 yr

If getResourceAsStream is returning null, then you want to set a break point there and (if possible) step into the method using the debugger. Do a double check that the asset path you're trying to read is correct (including case, because "files" inside jars are case sensitive even on Windoze systems).

The logs will have more info than the console. Is there a log complaint about an asset not found?

The debugger is a powerful and necessary tool in any IDE, so learn how to use it. You'll be able to tell us more and get better help here if you investigate your runtime problems in the debugger before posting.

Quote

March 6, 20169 yr

Author

The problem seemed to be my java for some reason.. Since I completed working on my mod on another machine and it works now..

Still thank you for the answer :'D

Quote

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[1.8.9] NPE while reading Schematics

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