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Use Java Melody to see into Production JVM and DB Stat's

Java Melody is an open source and production ready JVM and DB Monitoring tool, use it in QA, Stage, or  Production environments and it's similar to most other profiler's. Just drop couple of jar files into your war and monitor your application in real time.

Alternatives to Java Melody


  Heap - helps you understand how much heap your application may need depending on the load and set -Xms and -Xmx appropriately

   Perm Gem, configure -XX:PermSize=128m correctly to avoid JVM Out of Memory Exceptions 


CPU - Understand how much CPU cycles your application used under different load so you can add more CPU's or Memory accordingly

1. Ehcache - 

Ability to see all created caches, their configuration, total objects in them, hits, and efficiency, this is really nice since you can monitor it in real time and keep tweaking until you achieve perfect configuration.

Monitor JDBC, JPA, Hibernate

SQL Hit Rate

SQL or Hibernate Query Performance - See all your SQL or Hibernate Queries perform, fine-tune or cache result if needed

Spring Bean - This is really awesome see which method needs tuning or caching (@Cacheable ) or Async (@Async) call

JSP, HTML, JavaScript, CSS file Stats - Decide which files need to be moved to CDN or Web Layer

Log4j - Monitor Error logs live

HTTP Session 

Find easy Installation Instructions 


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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

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…