spring-loaded rocks !

Today I found spring loaded (https://github.com/spring-projects/spring-loaded)
in short this is a java agent that enables class reloading of already running VM.
Simply this means zero deployment time (in many cases).
It is like a free and open source alternative of JRebel.
Spring Loaded allows you to add/modify/delete methods/fields/constructors. The annotations on types/methods/fields/constructors can also be modified and it is possible to add/remove/change values in enum types.
There is a preliminary java8 support. There is also another project DCEVM ( which is also great but supports only till JRE 6 update 26). More info here http://ssw.jku.at/dcevm/
But lets stop speaking and show you how it works.
In short you just need to pass the agent when starting the vm and that’s it.
>java -javaagent:D:/Downloads/springloaded-1.2.0.BUILD-20140409.201438-12.jar -noverify org.gochev.MainClass
I am using this Build since I am running Java 8 and this is currently the latest .
The code I in my simple app is the following:
A POJO like this :

package org.gochev;

public class DynamicReloadedClass {
 private int age = 30;

 public int getAge() {
  return age;
 }

 public void setAge(int age) {
  this.age = age;
 }
}




and a MainClass like this:


package org.gochev;

import java.util.Scanner;

public class MainClass {
 public static void main(String[] args) {
  try (Scanner scanner = new Scanner(System.in)) {
   while (true) {
    System.out.println("test "
    + new DynamicReloadedClass().getAge());
    scanner.next();
   }
  }
 }
}


So I can change the DynamicReloadedClass while the main method in the MainClass is looping. You can see this in action here :


http://www.screencast.com/t/KIFIxv7j


Awesome ... and free ! 

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ABOUT THE AUTHOR

Superhero with Java powers && Gamer && (Sci-Fi & Star Wars geek) && Bulgarian Java User Group Leader && nerds2nerds podcaster && (link: http://java.beer) java.beer guy ? this : null

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