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Issues with launching GanttProject on macOS #1637

dbarashev opened this Issue Jan 30, 2019 · 0 comments


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dbarashev commented Jan 30, 2019

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.

Essential diagnostics

Make sure that you really have Java Runtime. Open Terminal application and type java -version command. If Java Runtime is installed, you should see something like

java 10.0.2 2018-07-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)


  1. If Java Runtime is not installed, please install it. For GanttProject 2.8+ Java Runtime version 8 is recommended, although more recent versions most likely will be okay.
  2. If Java Runtime is installed, and you can run java in Terminal, you have a few options. First is to just try running GanttProject again. According to tests from our users it may help. If it does not then please try using fallback distro for Mojave which basically runs a shell script which executes java command with appropriate arguments.
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