Skip to main content

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

Memory

 
  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 

Comments

Post a Comment

Popular posts from this blog

Access multiple Databases in JPA

According to JPA specification we can define multiple "persistence-unit" elements (i.e. like below) in persistence.xml file and can easily refer them inside Dao layers as this. public class PolarDaoImpl {     @PersistenceContext(unitName="PolarPU")     protected EntityManager entityManager; -- } public class BearDaoImpl {     @PersistenceContext(unitName="BearPU")     protected EntityManager entityManager; -- } Checkout sample persistence.xml <?xml version="1.0" encoding="UTF-8"?> <persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">     <!-- Database 1 -->     <persistence-unit name="PolarPU" transaction-type="RESOURCE_LOCAL">         <
3 comments
Read more

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
21 comments
Read more

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
11 comments
Read more