Create Grails application from existing code
If you already have a Grails project, you can create a IntelliJ IDEA Grails Application around its source code. IntelliJ IDEA recognizes the structure and creates the Grails project view.
If you work with Grails 3 then you can simply import your project for the Gradle model since Grails 3 uses the Gradle build system.
For Grails 1 / 2 use the following procedure:
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Launch the New Project wizard. If no project is currently opened in IntelliJ IDEA, click Import Project on the Welcome screen. Otherwise, select from the main menu.
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In the dialog that opens, select your Grails project and click OK.
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On the next page of the wizard, select Create project from existing sources and click Next.
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On the next page of the wizard, select Create project from existing sources and click Next.
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On the next page of the wizard, specify the name and the location of your Grails project and click Next.
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On the next page of the wizard, select the source roots that you want to include in your project and click Next.
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On the next page of the wizard, select the libraries that will be included in your project and click Next.
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On the next page of the wizard, review the module structure and dependencies that will be added to the project and click Next.
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On the next page of the wizard, select the project SDK and click Next.
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On the next page of the wizard, IntelliJ IDEA displays frameworks if they were detected. Click Finish.
IntelliJ IDEA opens a Grails project with its dedicated structure. At this point if IntelliJ IDEA detects a Gradle build tool inside your project, the popup message suggesting to import the Gradle project will be displayed.