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JPA Lifecycle Callback Events

Typical Entity Life-cycle

  • Persist   - Creating Entity for the first time.
  • Merge   - Updating detached Entity
  • Load     - Loading Entity from Database
  • Delete   - Deleting Entity from Database

JPA provides total of 6 Annotations for Life-Cycle Callback events.

  1. @PrePersist
  2. @PostPersist
  3. @PreUpdate
  4. @PostUpdate
  5. @PreRemove
  6. @PostLoad

Following two ways to utilize the above annotations.

Case 1: Defining inside Entity class

Any method can be annotated with one or all annotations, though they should follow these rules.

  1.  Method can have any name
  2.  No parameters
  3.  Return type of void
  4.  Method should not be final or static
  5.  No Checked exceptions should be thrown
  6.  Any annotation can be only used on one method

Example Code Snippet - 1

public class Employee implements Serializable {

public void updateDate() {
    // this method will executed on all the lifecycle events.

Way 2 : Using Entity Listeners Classes
This is very nice way of using the annotations.

Example Code Snippet - 2

public class Employee implements NamedEntity {

public class LastAccessDateListener {
public void updateDate(Employee e) {
  // this method is in totally separate class


LastAccessDateListener class doesn't have to be annotated or extend any other class.


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Example 1: Stores list of Strings in an Entity

public class Users implements Serializable {

    private static final long serialVersionUID = 1L;
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private List<String> certifications = new ArrayList<String>();

    public Long getId() {
        return id;

    public void setId(Long id) { = id;

    public List<String> getCertifications() {
        return certifications;

    public void setCertifications(List<String> certifications) {
        this.certifications = certifications;

        Users u = new Users();
        u.getCertifications().add("Sun Certified Java Programmer");

Generated Tables

Column --> ID
    Row             1


Validating CSV Files

What is CsvValidator ?
  A Java framework which validates any CSV files something similar to XML validation using XSD.

Why should I use this ?
  You don't have to use this and in fact its easy to write something your own and also checkout its source code for reference.

Why did I write this ?
  Some of our projects integrate with third party application which exchanges information in CSV files so I thought of writing a generic validator which can be hooked in multiple projects or can be used by QA for integration testing.

What is the license clause ?

Are there any JUnit test cases for me checkout ?
 Yes, source

How to integrate in my existing project ?

Just add the Jar which can be downloaded from here CsvValidator.jar and you are good.

Instantiate CsvValidator constructor which takes these 3 arguements

         // filename is the the file to be validated and here is a sample         // list - defines all the fields in the above csv file ( a field has index, type, isOptional, rege…