Many to Many Invalid Object name

问题

I have a Many-To-Many relationship created between Employee-Project in my code, but when I want to use its throws this exception:

com.microsoft.sqlserver.jdbc.SQLServerException: Invalid object name 'employee_project'.

I tried, but I did not succeed finding the root cause of this exception. SO, please help me.

Below are the POJOs for Employee and Project and also the code that throws this exception

Employee pojo:

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

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "EMPLOYEE_ID_PK")
private int employeeIdPk;

@ManyToMany(fetch = FetchType.LAZY,  cascade = {
        CascadeType.PERSIST,
        CascadeType.MERGE
        },
        mappedBy = "workers")
private Collection<Project> projects = new HashSet<Project>(0);
}

Project pojo:

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

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "PROJECT_ID_PK")
private int projectIdPk;

@ManyToMany(fetch = FetchType.LAZY, cascade = {
        CascadeType.PERSIST,
        CascadeType.MERGE
    })
@JoinTable(name = "EmployeeProject", joinColumns = { 
        @JoinColumn(name = "PROJECT_ID_PK") }, 
        inverseJoinColumns = { @JoinColumn(name = "EMPLOYEE_ID_PK") })
Collection<Employee> workers = new HashSet<Employee>(0);
}

Problem code:

Project project = projectRepository.findByProjectIdPk(24);
Collection<Employee> employees = project.getWorkers();

I am using Spring Data Jpa and SQL Server. : Here is a picture of my current database

回答1:

So, I solved the problem myself. Apparently, if I add an underscore inside @JoinTable(Employee_Project) and also change that in database its works.

Can somebody please explain why I had to do this?

来源：https://stackoverflow.com/questions/50334319/many-to-many-invalid-object-name

标签

java

hibernate

jpa

orm

many-to-many