Fix server issues

src/main/java/com/kasetoatz/boatjump/BoatJump.java

@@ -1,13 +0,0 @@
-package com.kasetoatz.boatjump;
-
-import net.fabricmc.api.ModInitializer;
-import net.minecraft.client.MinecraftClient;
-
-public class BoatJump implements ModInitializer {
-    public static MinecraftClient client;
-
-    @Override
-    public void onInitialize() {
-        client = MinecraftClient.getInstance();
-    }
-}

src/main/java/com/kasetoatz/boatjump/mixin/BoatEntityMixin.java

@@ -1,7 +1,7 @@
 package com.kasetoatz.boatjump.mixin;
 
-import com.kasetoatz.boatjump.BoatJump;
 import net.minecraft.entity.EntityType;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.entity.vehicle.AbstractBoatEntity;
 import net.minecraft.entity.vehicle.VehicleEntity;
 import net.minecraft.world.World;
@@ -22,7 +22,7 @@ public abstract class BoatEntityMixin extends VehicleEntity {
 
     @Inject(method="tick", at=@At("HEAD"))
     public void tick(CallbackInfo ci) {
-        if (this.getControllingPassenger() == BoatJump.client.player && this.location == AbstractBoatEntity.Location.IN_WATER) {
+        if (this.getControllingPassenger() instanceof PlayerEntity && this.location == AbstractBoatEntity.Location.IN_WATER) {
             this.setOnGround(true);
         }
     }

src/main/java/com/kasetoatz/boatjump/mixin/EntityMixin.java

@@ -1,8 +1,8 @@
 package com.kasetoatz.boatjump.mixin;
 
-import com.kasetoatz.boatjump.BoatJump;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.entity.vehicle.AbstractBoatEntity;
 import org.jetbrains.annotations.Nullable;
 import org.spongepowered.asm.mixin.Mixin;
@@ -17,7 +17,7 @@ public abstract class EntityMixin {
 
     @Inject(method="getStepHeight", at = @At("HEAD"), cancellable = true)
     public void getStepHeight(CallbackInfoReturnable<Float> cir) {
-        if ((Entity)(Object)this instanceof AbstractBoatEntity && this.getControllingPassenger() == BoatJump.client.player) {
+        if ((Entity)(Object)this instanceof AbstractBoatEntity && this.getControllingPassenger() instanceof PlayerEntity) {
             cir.setReturnValue(1.f);
         }
     }

src/main/resources/fabric.mod.json

@@ -10,11 +10,6 @@
   },
   "license": "MIT",
   "environment": "*",
-  "entrypoints": {
-    "main": [
-      "com.kasetoatz.boatjump.BoatJump"
-    ]
-  },
   "mixins": [
     "boatjump.mixins.json"
   ],