Java18.md

Web App Security

Hibernate Many to Many

Simple Entity Relationship Diagram:

The model classes Employee and Project need to be created with JPA annotations:

 @Entity
 @Table(name = "Employee")
 public class Employee { 
 // ...

 @ManyToMany(cascade = { CascadeType.ALL })
 @JoinTable(
    name = "Employee_Project", 
    joinColumns = { @JoinColumn(name = "employee_id") }, 
    inverseJoinColumns = { @JoinColumn(name = "project_id") }
 )
 Set<Project> projects = new HashSet<>();

 // standard constructor/getters/setters
 }

 @Entity
 @Table(name = "Project")
 public class Project {    
 // ...  

 @ManyToMany(mappedBy = "projects")
  private Set<Employee> employees = new HashSet<>();

 // standard constructors/getters/setters   
 }     

The @ManyToMany annotation is used in both classes to create the many-to-many relationship between the entities.