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How to decompile class files in Java with eclipse IDE

02 Nov

Today i am going to post the article on how to decompile the third party jar files source code to debug it.

JAD – JAVA decompiler is one of the plug IN which will decompile and provide us the source code.

For example, if we want to see the below source code for the below spring given class

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Without JAD, when we click on the above link it will be like below (i.e not able to see the source code).

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Here i am  going to explain the 2 ways , how to integrate the plug IN with eclipse IDE.

Here are the detailed screen shots which explains the step by step to integrate the plug IN with eclipse

WAY -1:  Download JAR and use it as plug IN

1. Download net.sf.jadclipse_3.3.0.jar file from the below site

http://www.java2s.com/Code/Jar/n/Downloadnetsfjadclipse330jar.html

2. Place the jar file under the eclipse plugins folder. I am using STS IDE see below

STS IDE  — spring-tool-suite-3.6.1.RELEASE-e4.4-win32-x86_64\sts-bundle\sts-3.6.1.RELEASE\plugins\

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3. Place the jar file under the above location. Screen shot looks like below

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4. Start the eclipse and set the below configuration in the IDE

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

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5. Select Jadclipse class file viewer as default viewer for *.class and *.class without source code

6. Now we are done with the configuration and ready to use the JAD. Go back and click on the above spring class URL  and see the source code. Below screen shot for reference.

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WAY-2: JAD as Plug IN

1. Open eclipse IDE and go to Preference in the menu bar and select Install New Software

3Click Add button and add the JAD plugin URL

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Click OK. Select the check box and click Next button

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Click Next button

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Click Next button

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Click Finish

9Click OK button to install the plug IN successfully.

10Click Yes to restart the STS IDE.

Once restarted do the below configuration in IDE

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

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Select Jadclipse class file viewer as default viewer for *.class and *.class without source code

Now we are done with Plug IN integration and ready to use it.

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When you click on the above spring class, see the source code after the plug IN install

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JAD Official web site

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

Happy Learning!.

Get glued to know more updates.

Have a nice day 🙂

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1 Comment

Posted by on November 2, 2014 in Uncategorized

 

One response to “How to decompile class files in Java with eclipse IDE

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