IntelliJ IDEA suggests convenient means of navigation within Grails applications. The following cases are possible:
- In a controller, with the caret within an action: Click the icon
in the left gutter:

The corresponding <name>.gsp file opens in the editor. - In a view file <name>.gsp: click the Controller button on the
scaffolding toolbar:

The corresponding controller opens in the editor, with the caret resting before the action name.
- With the caret at the template name, press Ctrl+B
- Keeping Ctrl pressed, click the template name:

See Also
Language and Framework-Specific Guidelines:
Web Resources: