Many To Many JPA Relationships

src/main/java/guru/springframework/domain/Category.java

@@ -0,0 +1,40 @@
+package guru.springframework.domain;
+
+import javax.persistence.*;
+import java.util.Set;
+
+@Entity
+public class Category {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String description;
+
+    @ManyToMany(mappedBy = "categories")
+    private Set<Recipe> recipes;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public Set<Recipe> getRecipes() {
+        return recipes;
+    }
+
+    public void setRecipes(Set<Recipe> recipes) {
+        this.recipes = recipes;
+    }
+}

src/main/java/guru/springframework/domain/Recipe.java

@@ -35,6 +35,12 @@ public class Recipe {
     @OneToOne(cascade = CascadeType.ALL)
     private Notes notes;
 
+    @ManyToMany
+    @JoinTable(name = "recipe_category ",
+    joinColumns = @JoinColumn(name = "recipe_id"),
+    inverseJoinColumns = @JoinColumn(name = "category_id"))
+    private Set<Category> categories;
+
     public Long getId() {
         return id;
     }
@@ -130,4 +136,12 @@ public Notes getNotes() {
     public void setNotes(Notes notes) {
         this.notes = notes;
     }
+
+    public Set<Category> getCategories() {
+        return categories;
+    }
+
+    public void setCategories(Set<Category> categories) {
+        this.categories = categories;
+    }
 }