JPA/Hibernate persist does not appear to work

Question

I'm using JPA (Hibernate implementation) to save objects to the database. Selecting works fine, but for some reason, saving doesn't work. I don't get any errors, but the database doesn't get changed either. This goes for both new entities and existing ones.

    EPayment pay = new EPayment();
    pay.setAmount(payment.getAmount());
    ...
    pay.setUserByToUserId(receiver);
    CompayDAO.get().save(pay);

CompayDAO.save()

public void save(Object ent) {
    System.out.println("Persisting: " + ent + " using " + this);
    this.em.persist(ent);
}

Console output:

Opening DOA nl.compay.entities.CompayDAO@b124fa
Persisting: nl.compay.entities.EUser@1e2fe5d using nl.compay.entities.CompayDAO@b124fa
Persisting: nl.compay.entities.EUser@30b601 using nl.compay.entities.CompayDAO@b124fa
Persisting: nl.compay.entities.EPayment@ed3b53 using nl.compay.entities.CompayDAO@b124fa
Closing DOA nl.compay.entities.CompayDAO@b124fa

EPayment

package nl.compay.entities;

// Generated 21-mei-2009 12:27:07 by Hibernate Tools 3.2.2.GA

import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

/**
 * Payment generated by hbm2java
 */
@Entity
@Table(name = "payment", catalog = "compay")
public class EPayment implements java.io.Serializable {

    private static final long serialVersionUID = -2578493336948256566L;

    private Integer id;
    private EUser userByToUserId;
    private EUser userByFromUserId;
    private String description;
    private float amount;
    private String method;
    private Date paydate;

    public EPayment() {
    }

    public EPayment(EUser userByToUserId, EUser userByFromUserId, float amount,
            Date paydate) {
        this.userByToUserId = userByToUserId;
        this.userByFromUserId = userByFromUserId;
        this.amount = amount;
        this.paydate = paydate;
    }

    public EPayment(EUser userByToUserId, EUser userByFromUserId,
            String description, float amount, String method, Date paydate) {
        this.userByToUserId = userByToUserId;
        this.userByFromUserId = userByFromUserId;
        this.description = description;
        this.amount = amount;
        this.method = method;
        this.paydate = paydate;
    }

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "id", unique = true, nullable = false)
    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "to_user_id", nullable = false)
    public EUser getUserByToUserId() {
        return this.userByToUserId;
    }

    public void setUserByToUserId(EUser userByToUserId) {
        this.userByToUserId = userByToUserId;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "from_user_id", nullable = false)
    public EUser getUserByFromUserId() {
        return this.userByFromUserId;
    }

    public void setUserByFromUserId(EUser userByFromUserId) {
        this.userByFromUserId = userByFromUserId;
    }

    @Column(name = "description", length = 1024)
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    @Column(name = "amount", nullable = false, precision = 8)
    public float getAmount() {
        return this.amount;
    }

    public void setAmount(float amount) {
        this.amount = amount;
    }

    @Column(name = "method", length = 50)
    public String getMethod() {
        return this.method;
    }

    public void setMethod(String method) {
        this.method = method;
    }

    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "paydate", nullable = false, length = 0)
    public Date getPaydate() {
        return this.paydate;
    }

    public void setPaydate(Date paydate) {
        this.paydate = paydate;
    }

}

Answer 1

As Sherkaner mentioned, a save doesn't result in an INSERT or UPDATE directly. You have to flush the session or - better in my opinion - close the unit of work / commit the transaction. You do have transactions?

Answer 2

use @Transactional on your method.....

@Transactional
public void save(Object ent){
.....
.....
}