problem with saving data in many-to-many intermediate table spring boot - spring-boot

Question

following are my entity
package bt.gov.dit.inventoryservice.model;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
//import org.hibernate.mapping.Set;
import javax.persistence.*;
import java.io.Serializable;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
#Entity
#Table(name = "items")
public class Items implements Serializable {
private Long Id;
#Column(name = "item_name")
private String itemName;
// #ManyToOne(fetch = FetchType.LAZY)
// #JoinColumn(name = "categories_id",nullable = false, referencedColumnName = "id")
private Categories categories;
private Stores stores;
//#Temporal(TemporalType.TIMESTAMP)
#Column(name = "insert_date")
private Date insertDate = new Date();
// #Temporal(TemporalType.TIMESTAMP)
#Column(name = "update_date")
private Date updateDate = new Date();
private Set<Logs> logs = new HashSet<Logs>() ;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
public Long getId() {
return Id;
}
public void setId(Long id) {
Id = id;
}
public String getItemName() {
return itemName;
}
public void setItemName(String itemName) {
this.itemName = itemName;
}
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "categories_id", nullable = false, referencedColumnName = "id")
public Categories getCategories() {
return categories;
}
public void setCategories(Categories categories) {
this.categories = categories;
}
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "stores_id", nullable = false, referencedColumnName = "id")
public Stores getStores() {
return stores;
}
public void setStores(Stores stores) {
this.stores = stores;
}
public Date getInsertDate() {
return insertDate;
}
public void setInsertDate(Date insertDate) {
this.insertDate = insertDate;
}
public Date getUpdateDate() {
return updateDate;
}
public void setUpdateDate(Date updateDate) {
this.updateDate = updateDate;
}
#ManyToMany(cascade = CascadeType.ALL)
#JoinTable(name = "items_logs", joinColumns = #JoinColumn(name = "items_id", referencedColumnName = "id"), inverseJoinColumns = #JoinColumn(name = "logs_id",referencedColumnName = "id") )
public Set<Logs> getLogs() {
return logs;
}
public void setLogs(Set<Logs> logs) {
this.logs = logs;
}
}
package bt.gov.dit.inventoryservice.model;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import javax.persistence.*;
import java.io.Serializable;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
#Entity
#Table(name = "logs")
public class Logs {
private Long id;
#Column(name = "cadet_id")
private Long cadetId;
private Set<Items> items = new HashSet<Items>() ;
#Column(name = "borrowed_date")
//#Temporal(TemporalType.TIMESTAMP)
private Date borrowedDate = new Date();
private String status;
private String comments;
#Id
#GeneratedValue
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Long getCadetId() {
return cadetId;
}
public void setCadetId(Long cadetId) {
this.cadetId = cadetId;
}
public Date getBorrowedDate() {
return borrowedDate;
}
public void setBorrowedDate(Date borrowedDate) {
this.borrowedDate = borrowedDate;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getComments() {
return comments;
}
public void setComments(String comments) {
this.comments = comments;
}
#ManyToMany(fetch = FetchType.LAZY,mappedBy = "logs")
public Set<Items> getItems() {
return items;
}
public void setItems(Set<Items> items) {
this.items = items;
}
}
I have many to many relationship between them. Due to that there is an intermediate table created with field item_id and log_id. Now I don't know how to save data in that table. I can save items and i can save log. But I have problem with saving the many-to-many relationship between them?