Decompilers are one of the most important tool for developers. Many Java developers use Eclipse IDE and many MuleSoft developers use Anypoint Studio (just another flavour of Eclipse) for their development work. We can easy configure decompiler for these IDEs. Here are the simple steps (for both IDEs): Download update site archive from here . Unzip the archive and note the location/path Open Eclipse or MuleSoft Anypoint Studio Click on "Help" Select "Install New Software..." Click on "Add..." button On the pop-up, type name as "Java Decompiler" (or any other name) Click on "Local..." button Select the unzip location (Step 2) Click "OK" button to close the pop-up Select checkbox: Java Decompiler Eclipse Plug-in Click on "Next" Select "Yes" for the agreement Select "Finish" Restart Eclipse or MuleSoft Anypoint Studio Now, Eclipse or MuleSoft Anypoint Studio can decompile Java ....