block class

package com.sixthsurge.smithing.blocks.toolsmithtable;

import com.sixthsurge.smithing.SmithingMod;
import net.minecraft.block.Block;
import net.minecraft.block.BlockState;
import net.minecraft.block.SoundType;
import net.minecraft.block.material.Material;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.IBlockReader;

import javax.annotation.Nullable;

public class ToolsmithTable extends Block {

    public static ToolsmithTable instance;

    public ToolsmithTable() {
        super(Properties.create(Material.ROCK)
                .sound(SoundType.WOOD)
                .hardnessAndResistance(1.0f)
        );

        setRegistryName(SmithingMod.MOD_ID, "toolsmith_table");

        instance = this;
    }

    @Override
    public boolean hasTileEntity() { return true; }

    @Nullable
    @Override
    public TileEntity createTileEntity(BlockState state, IBlockReader world) {
        return new ToolsmithTableTile();
    }
}

tile entity class

package com.sixthsurge.smithing.blocks.toolsmithtable;

import com.sixthsurge.smithing.SmithingMod;
import net.minecraft.block.Block;
import net.minecraft.block.BlockState;
import net.minecraft.block.SoundType;
import net.minecraft.block.material.Material;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.IBlockReader;

import javax.annotation.Nullable;

public class ToolsmithTable extends Block {

    public static ToolsmithTable instance;

    public ToolsmithTable() {
        super(Properties.create(Material.ROCK)
                .sound(SoundType.WOOD)
                .hardnessAndResistance(1.0f)
        );

        setRegistryName(SmithingMod.MOD_ID, "toolsmith_table");

        instance = this;
    }

    @Override
    public boolean hasTileEntity() { return true; }

    @Nullable
    @Override
    public TileEntity createTileEntity(BlockState state, IBlockReader world) {
        return new ToolsmithTableTile();
    }
}

where i register it (in a class with @Mod.EventBusSubscriber(bus = Mod.EventBusSubscriber.Bus.MOD)

    @SubscribeEvent
    public static void onTileEntityRegistry(final RegistryEvent.Register<TileEntityType<?>> event) {
        event.getRegistry().register(TileEntityType.Builder.create(ToolsmithTableTile::new, ToolsmithTable.instance).build(null).setRegistryName(SmithingMod.MOD_ID, "toolsmith_table"));
    }