Click Here to see my earlier post how to decompile java class files in eclipse IDE using plugIN.
Here is the another way to decompile the third party library files (jar files) to debug the source code.
Go to the below site to download the decompiler jar file
Click on the second option Download zip and run directly from your Windows PC for Windows to download zip file, as i am working with Windows 7.I have download the windows version zip file.
For Linux / Mac versions, use Download gzip and run directly from your Mac or Linux box option to download the zip file
Once you have downloaded d4j.zip, extract the zip it looks like below
Just Click on open button and select required jar file ( i have selected h2.jar) and click Open
Now it will display the source code. Left side we can see the package structure.
Note : Recommended install JDK Version 8.
Get glued to know more updates.
Have a nice day 🙂