What I like in Spring

What I like in Spring

Spring IOC - Its all about programming to Interfaces, Though some people argue its a over kill
Spring Security - Protects URL's and Object Methods
Spring JPA -
Spring Data
Spring Transactions
Spring Scheduling
Spring support for JAX-WS
Spring AOP
Spring Testing - Ability to test Transactional objects and rollback

What is like most in Spring 3.x

Annotations - I hate XML, i don't have to switch files (xml and java) to finish my java class and bug free.
@Async - love this, you can use this in many situations specially sending Emails.
@Timer - Simple and great Timer implementation,
@Cacheable - Dead simple method cache implementation, other alternative is to use Spring Modules framework's which has little complex configuration

Comments

JPA 2 new feature @ElementCollection explained

@ElementCollection is new annotation introduced in JPA 2.0, This will help us get rid of One-Many and Many-One shitty syntax. Example 1: Stores list of Strings in an Entity @Entity public class Users implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @ElementCollection private List<String> certifications = new ArrayList <String> (); public Long getId() { return id; } public void setId(Long id) { this.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"); em.persist(u); Generated Tables Users Co

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 ? GNU GPL v2 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 c onstructor 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

Reuse JPA Entities as DTO

Note : Major design advantages of JPA Entities are they can detached and used across tiers and networks and later can by merged. Checkout this new way of querying entities in JPA 2.0 String ql = " SELECT new prepclass2.Employee (e.firstname, e.lastname) FROM Employee e "; List<Employee> dtos = em.createQuery(ql).getResultList(); The above query loads all Employee entities but with subset of data i.e. firstname, lastname. Employee entity looks like this. @Entity @Table(name="emp") public class Employee implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @Column private String firstname; @Column private String lastname; @Column private String username; @Column private String street; @Column private String city; @Column private String state; @Column private String zipc

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