Mostly done

src/main/java/com/booleanuk/api/Main.java

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+package com.booleanuk.api;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Main {
+    public static void main(String[] args) {
+        SpringApplication.run(Main.class, args);
+    }
+}

src/main/java/com/booleanuk/api/controller/ProductController.java

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+package com.booleanuk.api.controller;
+
+import com.booleanuk.api.model.Product;
+import com.booleanuk.api.model.ProductRepo;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("products")
+public class ProductController {
+    private final ProductRepo authorDB;
+
+    public ProductController(){
+        this.authorDB = new ProductRepo();
+    }
+
+    @GetMapping("")
+    public List<Product> getAll() {
+        return this.authorDB.getAll();
+    }
+
+    @GetMapping("{/category}")
+    public List<Product> getByCategory(@RequestParam String category) {
+        return this.authorDB.getByCategory(category);
+    }
+
+    @GetMapping("/{id}")
+    public Product getForID(@PathVariable (name="id") int id){
+        return this.authorDB.getForID(id);
+    }
+
+    @PutMapping("/{id}")
+    public Product updateForID(@PathVariable (name="id") int id, @RequestBody Product product){
+        return this.authorDB.update(id, product);
+    }
+
+    @DeleteMapping("/{id}")
+    public HttpStatus deleteForID(@PathVariable (name="id") int id){
+        this.authorDB.delete(id);
+        return HttpStatus.OK;
+    }
+
+    @PostMapping()
+    public Product create(@RequestBody Product product){
+        return this.authorDB.create(product);
+    }
+}

src/main/java/com/booleanuk/api/model/Product.java

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+package com.booleanuk.api.model;
+
+public class Product {
+    private static int nextID = 0;
+
+    private int id;
+    private String name;
+    private String category;
+    private int price;
+
+    public Product(String name, String category, int price) {
+        this.id = nextID;
+        nextID++;
+        this.name = name;
+        this.category = category;
+        this.price = price;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+
+    public String getCategory() {
+        return category;
+    }
+
+    public void setCategory(String category) {
+        this.category = category;
+    }
+
+    public void update(Product product, int id){
+        this.category = product.getCategory();
+        this.name = product.getName();
+        this.id = id;
+        this.price = product.getPrice();
+    }
+}

src/main/java/com/booleanuk/api/model/ProductRepo.java

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+package com.booleanuk.api.model;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class ProductRepo {
+    private ArrayList<Product> products;
+
+    public ProductRepo(){
+        this.products = new ArrayList<>();
+        this.products.add(new Product("Norway's greatest hits", "CD", 2));
+        this.products.add(new Product("Nina Jirachi - Fk My Computer", "Vinyl", 999));
+    }
+
+    public List<Product> getAll(){
+        return products;
+    }
+
+    public List<Product> getByCategory(String category){
+        return products.stream().filter(product -> Objects.equals(category, product.getCategory())).toList();
+    }
+
+    public Product getForID(int id){
+        Product product = null;
+        try {
+            product = this.products.get(id);
+        } catch (Exception e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found");
+        }
+        return product;
+    }
+
+    public Product update(int id, Product product){
+        Product productToUpdate = null;
+        try {
+            productToUpdate = this.products.get(id);
+        } catch (Exception e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found");
+        }
+
+        productToUpdate.update(product, id);
+        return productToUpdate;
+    }
+
+    public void delete(int id){
+        try {
+            this.products.remove(id);
+        } catch (Exception e) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Not found");
+        }
+    }
+
+    public Product create(Product product){
+        this.products.add(product);
+        return this.getForID(product.getId());
+    }
+}