Updated to Entities 0.3.0 and updated to latest syntaxes

DOTS_Pong/Assets/Ball.prefab

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DOTS_Pong/Assets/Paddle.prefab

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DOTS_Pong/Assets/Scenes/Pong.unity

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DOTS_Pong/Assets/Scripts/GameManager.cs

 		main = this;
 		playerScores = new int[2];
 
+		GameObjectConversionSettings settings = GameObjectConversionSettings.FromWorld(World.DefaultGameObjectInjectionWorld, null);
+		ballEntityPrefab = GameObjectConversionUtility.ConvertGameObjectHierarchy(ballPrefab, settings);
-		ballEntityPrefab = GameObjectConversionUtility.ConvertGameObjectHierarchy(ballPrefab, World.Active);
 
 		oneSecond = new WaitForSeconds(1f);
 		delay = new WaitForSeconds(respawnDelay);
 		manager.AddComponent(ball, typeof(BallTag));
 
 		Vector3 dir = new Vector3(UnityEngine.Random.Range(0, 2) == 0 ? -1 : 1, UnityEngine.Random.Range(-.5f, .5f), 0f).normalized;
-		Vector3 speed = dir * ballSpeed;//UnityEngine.Random.insideUnitCircle * ballSpeed;
+		Vector3 speed = dir * ballSpeed;
 
 		PhysicsVelocity velocity = new PhysicsVelocity()
 		{

DOTS_Pong/Packages/manifest.json

 {
   "dependencies": {
     "com.unity.collab-proxy": "1.2.16",
-    "com.unity.entities": "0.2.0-preview.18",
+    "com.unity.entities": "0.3.0-preview.4",
+    "com.unity.quicksearch": "1.4.1",
     "com.unity.rendering.hybrid": "0.2.0-preview.18",
     "com.unity.test-framework": "1.1.3",
     "com.unity.textmeshpro": "2.0.1",

DOTS_Pong/Assets/Scripts/Data Components/PaddleDataComponents.cs.meta

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DOTS_Pong/Assets/Scripts/Data Components.meta

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DOTS_Pong/Assets/Scripts/Systems.meta

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DOTS_Pong/Assets/Scripts/Data Components/BallTag.cs

+using Unity.Entities;
+
+[GenerateAuthoringComponent]
+public struct BallTag : IComponentData
+{ }

DOTS_Pong/Assets/Scripts/Data Components/PaddleDataComponents.cs

+using Unity.Entities;
+using UnityEngine;
+
+[GenerateAuthoringComponent]
+public struct PaddleInputData : IComponentData
+{
+	public KeyCode upKey;
+	public KeyCode downKey;
+}

DOTS_Pong/Assets/Scripts/Data Components/PaddleMovementData.cs

+using Unity.Entities;
+
+[GenerateAuthoringComponent]
+public struct PaddleMovementData : IComponentData
+{
+	public int direction;
+	public float speed;
+}

DOTS_Pong/Assets/Scripts/Data Components/PaddleMovementData.cs.meta

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DOTS_Pong/Assets/Scripts/Systems/PaddleMovementSystem.cs

+using System.Collections;
+using System.Collections.Generic;
+using Unity.Collections;
+using Unity.Entities;
+using Unity.Jobs;
+using Unity.Mathematics;
+using Unity.Transforms;
+using UnityEngine;
+
+public class PaddleMovementSystem : JobComponentSystem
+{
+	protected override JobHandle OnUpdate(JobHandle inputDeps)
+	{
+		float deltaTime = Time.DeltaTime;
+		float yBound = GameManager.main.yBound;
+
+		JobHandle handle = Entities
+			.WithBurst()
+			.WithReadOnly(deltaTime)
+			.WithReadOnly(yBound)
+			.ForEach((ref Translation trans, in PaddleMovementData data) => 
+		{
+			float3 pos = trans.Value;
+			pos.y += data.speed * data.direction * deltaTime;
+
+			if (pos.y > yBound) pos.y = yBound;
+			if (pos.y < -yBound) pos.y = -yBound;
+
+			trans.Value = pos;
+		}).Schedule(inputDeps);
+
+		return handle;
+	}
+
+}

DOTS_Pong/Assets/Scripts/Systems/PlayerInputSystem.cs

+using Unity.Entities;
+using Unity.Jobs;
+using UnityEngine;
+
+public class PlayerInputSystem : JobComponentSystem
+{
+	protected override JobHandle OnUpdate(JobHandle inputDeps)
+	{
+		Entities.ForEach((ref PaddleInputData inputData, ref PaddleMovementData moveData) =>
+		{
+			moveData.direction = 0;
+
+			moveData.direction += Input.GetKey(inputData.upKey) ? 1 : 0;
+			moveData.direction -= Input.GetKey(inputData.downKey) ? 1 : 0;
+		}).Run();
+
+		return inputDeps;
+	}
+}

DOTS_Pong/Assets/Scripts/DataComponents.cs

-using System.Collections;
-using System.Collections.Generic;
-using Unity.Entities;
-using UnityEngine;
-
-public struct PlayerInputData : IComponentData
-{
-	public KeyCode upKey;
-	public KeyCode downKey;
-}
-
-public struct PlayerData : IComponentData
-{
-	public int playerID;
-}
-
-public struct PaddleMovementData : IComponentData
-{
-	public int direction;
-	public float speed;
-}
-
-public struct BallTag : IComponentData
-{ }

DOTS_Pong/Assets/Scripts/PaddleConversion.cs

-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-using Unity.Entities;
-
-public class PaddleConversion : MonoBehaviour, IConvertGameObjectToEntity
-{
-	public int playerID;
-	public float speed = 3f;
-	public KeyCode upKey;
-	public KeyCode downKey;
-
-	public void Convert(Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem)
-	{
-		dstManager.AddComponentData(entity, new PlayerData { playerID = playerID });
-
-		dstManager.AddComponentData(entity, new PaddleMovementData { direction = 0, speed = speed });
-
-		PlayerInputData data = new PlayerInputData
-		{
-			upKey = upKey,
-			downKey = downKey
-		};
-		dstManager.AddComponentData(entity, data);
-	}
-}

DOTS_Pong/Assets/Scripts/PaddleMovementSystem.cs

-using System.Collections;
-using System.Collections.Generic;
-using Unity.Collections;
-using Unity.Entities;
-using Unity.Jobs;
-using Unity.Mathematics;
-using Unity.Transforms;
-using UnityEngine;
-
-public class PaddleMovementSystem : JobComponentSystem
-{
-	public struct MoveJob : IJobForEach<PaddleMovementData, Translation>
-	{
-		public float deltaTime;
-		public float yBound;
-
-		public void Execute([ReadOnly] ref PaddleMovementData data, ref Translation trans)
-		{
-			float3 pos = trans.Value;
-			pos.y += data.speed * data.direction * deltaTime;
-
-			if (pos.y > yBound) pos.y = yBound;
-			if (pos.y < -yBound) pos.y = -yBound;
-
-			trans.Value = pos;
-		}
-	}
-
-	protected override JobHandle OnUpdate(JobHandle inputDeps)
-	{
-		MoveJob job = new MoveJob
-		{
-			deltaTime = Time.DeltaTime,
-			yBound = GameManager.main.yBound
-		};
-
-		return job.Schedule(this, inputDeps);
-	}
-
-}

DOTS_Pong/Assets/Scripts/PlayerInputSystem.cs

-using System.Collections;
-using System.Collections.Generic;
-using Unity.Entities;
-using UnityEngine;
-
-public class PlayerInputSystem : ComponentSystem
-{
-	protected override void OnUpdate()
-	{
-		Entities.ForEach((ref PlayerInputData inputData, ref PaddleMovementData moveData) => 
-		{
-			moveData.direction = 0;
-
-			moveData.direction += Input.GetKey(inputData.upKey) ? 1 : 0;
-			moveData.direction -= Input.GetKey(inputData.downKey) ? 1 : 0;
-		});
-	}
-}