This also happens in the GGTS.
My workaround for this is to create a Run Configuration. Open Run Configurations, double-click Grails, it will create a new Grails configuration. Rename it, select your project and enter the grails: run-app command. Click Apply or Run.
On the top toolbar, where you drop the configuration configurations, the new configuration should be enabled. Executing this method will not time out.
This STS related problem. Windows β Preferences β Grails β Grails Launch is the place where you can find all the options.
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