[java] How to get Java Decompiler / JD / JD-Eclipse running in Eclipse Helios

Java Decompiler (JD) is generally recommended as a good, well, Java Decompiler. JD-Eclipse is the Eclipse plugin for JD.

I had problems on several different machines to get the plugin running. Whenever I tried to open a .class file, the standard "Source not found" editor would show, displaying lowlevel bytecode disassembly, not the Java source output you'd expect from a decompiler.

Installation docs in http://java.decompiler.free.fr/?q=jdeclipse are not bad but quite vague when it comes to troubleshooting.

Opening this question to collect additional information: What problems did you encounter before JD was running in Eclipse Helios? What was the solution?

if you need to decompile standalone jar try JD-GUI by the same autor (of JD-Eclipse). It is a standalone application (does not need eclipse). It can open both *.class and *.jar files. Interesting enough it needs .Net installed (as do JD-Eclipse indeed), but otherwise works like a charm.

Find it here:

http://jd.benow.ca/

Regards,

Just download the site from the JD page. I was able to install from a local site in the isntalled software section of eclipse.

To Make it work in Eclipse Juno - I had to do some additional steps.

In General -> Editors -> File Association

1. Select "*.class" and mark "Class File Editor" as default
2. Select "*.class without source" -> Add -> "Class File Editor" -> Make it as default
3. Restart eclipse

After testing on Juno, Kepler and Luna, I found JD only works for *.class files on build path.

1. Adding the jar as a lib of an existing project
2. Go to Preferences->General->Editors->File Associations, set *.class without source to Class File Editor with a cup icon

I use jadeclipse instead, because it can't work in 3.6/3.7 eclipse

Update site http://webobjects.mdimension.com/jadclipse/3.6/

Intallation http://5thcross.wordpress.com/2009/05/20/installing-jadclipse-in-eclipse/

The JD-eclipse plugin 0.1.3 can only decompile .class files that are visible from the classpath/Build Path.

If your class resides in a .jar, you may simply add this jar to the Build Path as another library. From the Package Explorer browse your new library and open the class in the Class File Editor.

If you want to decompile any class on the file system, it has to reside in the appropriate folder hierachy, and the root folder has to be included in the build path. Here is an example:

1. Class is foo.bar.MyClass in .../someDir/foo/bar/MyClass.class
2. In your Eclipse project, add a folder with arbitrary name aClassDir, which links to .../someDir.
3. Add that linked folder to the Build Path of the project.
4. Use the Navigator View to navigate and open the .class file in the Class File Editor. (Note: Plain .class files on the file system are hidden in the Package Explorer view.)

Note: If someDir is a subfolder of your project, you might be able to skip step 2 (link folder) and add it directly to the Build Path. But that does not work, if it is the compiler output folder of the Eclipse project.

P.S. I wish I could just double click any .class file in any project subfolder without the need to have it in the classpath...

I made the steps 1, 2, 3 and the 7. and I put the folder with the class files in the project build path (right click, properties, java build path, libraries, add class folder, create new folder, advanced>>, link to folder in the file system, browse,...) then restart eclipse.

Its should work for all version of eclipse even in Spring tool suit(STS). Here is the steps

Go to the URl Follow The link to download or click the bellow link to direct download Click Here to download

Download JD-Eclipse. Download and unzip the JD-Eclipse Update Site,

Launch Eclipse,

Click on "Help > Install New Software...",

Click on button "Add..." to add an new repository,

Enter "JD-Eclipse Update Site" and select the local site directory,

Select extracted folder and give any name. I have given JDA. and click ok.

Check "Java Decompiler Eclipse Plug-in",

Next, next, next... and restart Eclipse.

I am using Eclipse 3.7 Indigo and Windows 7 64-bit:

What I did was to install the Microsoft Visual C++ 2008 SP1 Redistributable Package as suggested by the site and reminded by @Universalspezialist.

Then install the plugin as stated in the site: http://java.decompiler.free.fr/?q=jdeclipse

Go to preference, then find "File Associations" Click on the *.class, then set the "class File Editor" as default.

Restart Eclipse perhaps? (I did this, but I'm not sure if it's necessary or not)

Steps to add the Java Decompiler in Eclipse :

1. Open Eclipse IDE.
2. Click Help->Eclipse Marketplace Wizard
3. In Search tab find the JD (JD is keyword to get the Eclipse Class Decompiler)
4. Select the Eclipse Class Decompiler
5. Click on Install.
6. Restart Eclipse and check

JAD Decomplier plug-in for Eclipse version 3.x and 4.x.

update site: http://feeling.sourceforge.net/update

Steps:

1. Open Eclipse IDE.
2. Click Help->Install New software
3. Paste above URL and give name as JAD.
4. Select the Eclipse Class Decompiler
5. Click on Next and accept agreements
6. Install it.
7. Restart Eclipse and check now.

Simple thing i did to get it working:

Went in eclipse > Window > Preferences

(Optional)typed in the search box "file" to help trim the tree of options. Went to General > Editors > File associations.

Clicked the ".class" type. Below there were 2 editors present, i clicked on the "Class File Editor" - the one with the icon from JD, clicked the "Default" button on the right.

Done. Now all ur class are belong to us.

1. Download the JD-Eclipse Update Site(github.com/java-decompiler/jd-eclipse)

2. Launch Eclipse,

3. Click on "Help > Install New Software...",

4. Click on button "Add..." to add an new repository,

5. Enter "JD-Eclipse Update Site" and select the local site directory,

6. Check "Java Decompiler Eclipse Plug-in",

7. Next, next, next... and restart Eclipse.