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After downloading eclipse plugin for Java Decompiler from  http://java-decompiler.github.io/  follow below steps  Download JD-Eclipse ZIP file, Launch Eclipse, Click on  "Help > Install New Software..." , Drag and drop ZIP file on dialog windows, Check  "Java Decompiler Eclipse Plug-in" , Click on  "Next"  and  "Finish"  buttons, A warning dialog windows appear because  "org.jd.ide.eclipse.plugin_x.y.z.jar"  is not signed. Click on  "Install anyway"  button. Click on "Windows > Preferences " Search for "File Association" For "*.class" & "*.class without source" select Associate editor as "JD class file viewer". 👍