To decompile Java class in Eclipse IDE, you can download “Java Decompiler (Jad) Eclipse plugin“. With this plugin enabled in Eclipse IDE, when you click on any Java classes or F3 trace into the class, the plugin will decompile it automatically.

Integrated Java Decompiler (Jad) with Eclipse

See following steps to integrate Java Decompiler (Jad) with Eclipse IDE.

1. Download Jad

Download the Jad executable file.

Official Jad website seem not working any more, try mirror download links instead.
Jad Official website

  1. http://www.kpdus.com/jad.html

Jad mirror download

  1. http://www.softpedia.com/get/Programming/Debuggers-Decompilers-Dissasemblers/JAD.shtml
  2. http://www.varaneckas.com/jad

2. Download Jad Eclipse plugin

Download the Jad Eclipse plugin named “Jabclipse (net.sf.jadclipse_x.x.x.jar)
http://sourceforge.net/projects/jadclipse/

3. Copy it to Eclipse plugin folder

Copy the downloaded Jad Eclipse plugin – Jabclipse(jadclipse_x.x.x.jar) to Eclipse plugin folder.
For example,

D:\eclipse\plugins\net.sf.jadclipse_3.3.0.jar

P.S No need to extract it, just copy the whole jar file.

4. Restart Eclipse

Restart Eclipse to make the plugin take effect.

5. Configure Jadclipse in Eclipse

In Eclipse, Click Window –> Preference –> Java –> Jadclipse , Key in Jad’s path in “Path to Decompiler” field

jadEclipse

6. Done

In Eclipse, try F3 into any class which does not has the source, Jad will decompile it automatically.

see examples :

/*jadclipse*/// Decompiled by Jad v1.5.8f. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.kpdus.com/jad.html
// Decompiler options: packimports(3) radix(10) lradix(10) 
// Source File Name:   JSObject.java
 
package netscape.javascript;
 
import java.applet.Applet;
import sun.plugin.javascript.JSContext;
 
// Referenced classes of package netscape.javascript:
//            JSException
 
public abstract class JSObject
{
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