How do you view the project folder? Many types of Eclipse navigation filter output folders. Take a look at your project directory using the OS file system browser.
Java output directories are configured using project properties -> Java build path. You can go to this page to find out which folders are currently in use.
Please note that no jar is created in Eclipse java build. It generates a class directory. To create a jar, you must call File -> Export -> Jar File wizard or use an external script, such as ant or maven.
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