Cannot be cast to java.io.Serializable

[Predrag Ristic]

In my database there si one to one relationship between person and role.Role has a composite primary key so I'm using RokePk class to map that.When I try to read a certain user from the database this exception occurs:"com.spinnaker.pedja.Role cannot be cast to java.io.Serializable".Here are the classes:

Person.java:

package com.spinnaker.pedja;

import javax.persistence.*;
import static javax.persistence.FetchType.EAGER;

@Entity
@Table(name = "person", schema = "edukacija")
public class Person {

	@Id
	@Column(name = "username")
	private String username;

	@Column(name = "roleId", updatable = false, insertable = false)
	private int role_id;

	@Column(name = "first_name")
	private String firstName;

	@Column(name = "last_name")
	private String lastName;

	@Column(name = "password")
	private String password;

	@OneToOne
	@JoinColumn(referencedColumnName="roleId", name = "roleId")
	private Role role;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public int getRole_id() {
		return role_id;
	}

	public void setRole_id(int role_id) {
		this.role_id = role_id;
	}

	public String getFirstName() {
		return firstName;
	}

	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}

	public String getLastName() {
		return lastName;
	}

	public void setLastName(String lastName) {
		this.lastName = lastName;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public Role getRole() {
		return role;
	}

	public void setRole(Role role) {
		this.role = role;
	}

}

Role.java

package com.spinnaker.pedja;

import javax.persistence.*;

@Entity
@Table(name="role", schema = "edukacija")
public class Role {
	
	@EmbeddedId
	private RolePk rolePk;
	
//	@OneToOne(mappedBy = "role")
//	private Person person;
	
	@Column(name="roleId",insertable=false,updatable=false)
	private int roleId;
	
	@Column(name="role_name", insertable = false, updatable = false)
	private String roleName;

	public String getRoleName() {
		return roleName;
	}

	public void setRoleName(String roleName) {
		this.roleName = roleName;
	}

	public int getRoleId() {
		return roleId;
	}

	public void setRoleId(int roleId) {
		this.roleId = roleId;
	}

	public RolePk getRolePk() {
		return rolePk;
	}

	public void setRolePk(RolePk rolePk) {
		this.rolePk = rolePk;
	}

//	public Person getPerson() {
//		return person;
//	}
//
//	public void setPerson(Person person) {
//		this.person = person;
//	}
//	
	
}

RolePk.java:

package com.spinnaker.pedja;

import java.io.Serializable;

import javax.persistence.*;

@Embeddable
public class RolePk implements Serializable{

	/**
	 * 
	 */
	private static final long serialVersionUID = -2517851941873251699L;

	@Column(name="roleId", insertable = false, updatable = false)
	private int roleId;

	@Column(name="role_name", insertable = false, updatable = false)
	private String roleName;

	public int getRoleId() {
		return roleId;
	}

	public void setRoleId(int roleId) {
		this.roleId = roleId;
	}

	public String getRoleName() {
		return roleName;
	}

	public void setRoleName(String roleName) {
		this.roleName = roleName;
	}

	@Override
	public boolean equals(Object o) {
		if (o == this) {
			return true;
		}
		if (!(o instanceof RolePk)) {
			return false;
		}
		RolePk other = (RolePk) o;
		return this.roleId==other.roleId;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int hash = 17;
		hash = hash * prime + this.roleId;
		hash = hash * prime + this.roleId;
		return hash;
	}
}

Any ideas?

[Travis Hein]

Maybe make the Role and Person beans also implement Serializable interface. The RolePk bean does.

[Predrag Ristic]

Problem solved.Thanks!!!