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Issues with launching GanttProject on macOS #1637
Symptoms and Summary
You have macOS and you can't launch GanttProject application. It either says "Unable to load Java Runtime environment" or just nothing happens after double-clicking the application. These issues are reportedly specific to macOS Mojave with Java 10, however there are chances of seeing them on other combinations of macOS versions and Java Runtimes.
Make sure that you really have Java Runtime. Open