How to Read Class Files in Eclipse Using JadClipse Java developers often need to inspect the source code of third-party compiled .class files. Eclipse, by default, displays a “Source not found” page when opening these files. JadClipse is a powerful plug-in that integrates the Jad Java Decompiler into Eclipse, allowing you to seamlessly view decompiled source code.
Here is the step-by-step guide to installing, configuring, and using JadClipse in Eclipse. Step 1: Download the Required Components
To use JadClipse, you need two separate components: the Jad decompiler executable and the JadClipse plug-in jar file.
Download Jad Decompiler: Locate the Jad executable compiled for your operating system (e.g., jad.exe for Windows). Extract the executable file and save it to a permanent directory on your local machine (e.g., C:\java\jad.exe).
Download JadClipse: Download the JadClipse jar file (usually named net.sf.jadclipse_x.x.x.jar). Step 2: Install the JadClipse Plug-in
Once you have downloaded the plug-in jar file, you need to add it to your Eclipse installation. Close your Eclipse IDE if it is currently running. Navigate to your Eclipse installation directory. Locate the plugins folder (or the dropins folder).
Copy and paste the downloaded JadClipse jar file into this folder.
Restart Eclipse. (If the plug-in does not load, restart Eclipse using the -clean command line option). Step 3: Configure the Jad Path in Eclipse
Eclipse needs to know where the Jad decompiler executable is located to execute it.
Open Eclipse and go to Window > Preferences (or Eclipse > Settings on macOS).
In the left sidebar, expand the Java category and select JadClipse. Locate the field labeled Path to decompiler.
Enter the full absolute path to your Jad executable (e.g., C:\java\jad.exe).
In the Directory for temporary files field, specify a temporary directory where Jad can output decompiled files (e.g., C:\java\temp). Click Apply and Close. Step 4: Set JadClipse as the Default Class File Editor
To ensure that Eclipse automatically uses JadClipse whenever you double-click a .class file, you must adjust the file association settings. Go back to Window > Preferences. Navigate to General > Editors > File Associations. In the File types section on top, select .class.
In the Associated editors section below, select JadClipse Class File Viewer and click the Default button on the right.
Next, select .class without source in the file types section (if available).
Set JadClipse Class File Viewer as the default editor for this type as well. Click Apply and Close. Step 5: Read Class Files
With the configuration complete, reading class files is entirely automated.
Open from JARs: Expand any referenced library or JAR file in your Project Explorer, navigate to a package, and double-click a .class file.
Open by Type: Press Ctrl + Shift + T (or Cmd + Shift + T on Mac) to search for any compiled class. Opening it will launch the JadClipse viewer.
The file will open in the standard editor window, looking exactly like source code, with a comment at the top indicating that the code was decompiled by JadClipse. To ensure your setup works perfectly, \x3c!–cqw1tb jyUlde_55/HugV6–> Saved time \x3c!–TgQPHd||[91,“Saved time”,false,false]–> \x3c!–TgQPHd||[92,“Clear”,false,false]–> \x3c!–TgQPHd||[94,“Helpful”,false,false]–> Comprehensive \x3c!–TgQPHd||[93,“Comprehensive”,false,false]–> \x3c!–TgQPHd||[95,“Other”,true,true]–> \x3c!–TgQPHd||[2,“Incorrect”,false,false]–> Inappropriate \x3c!–TgQPHd||[9,“Inappropriate”,false,false]–> Not working \x3c!–TgQPHd||[70,“Not working”,true,false]–> \x3c!–TgQPHd||[11,“Unhelpful”,false,false]–> \x3c!–TgQPHd||[1,“Other”,true,true]–>
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