I use Eclipse 2021-09 on macOS 11.6. When I edit a file and press the Run button, it does not save the file before build.

In General --> Workspace --> Build I checked "Save automatically before manual build"

When I manually save the file before build, it works as expected.

Any idea what problem it could be?

CodePudding user response：

Run != Build. You want the first two options on the Launching preference page.

CodePudding user response：

After uninstallation and deletion of all related files, a new installation worked fine.