While the news is that IntelliJ 12.x will support Grails 2.3.0 sooner or later, right now the best bet is to use IDEA 13 EAP release. But the release has a few issues, which is good to be aware of while developing for Grails 2.3.0.
Problem 1: Migrating to Grails 2.3.0
While the built-in upgrade does a decent job of setting the Idea settings, you must ensure the following:
1. Add this to BuildConfig.groovy
grails.project.dependency.resolver = “maven” // or ivy
2. Set the tomcat version in plugins section
3. Set the correct hibernate version in plugins section
runtime “:hibernate:18.104.22.168” // or “:hibernate4:22.214.171.124”
These do not rely on $grailsVersion anymore. If you are using scaffolding, you have to specify that as a dependency too:
Problem 2: Running in Debug Mode
1. Edit Configurations, set command line to: run-app -debug
2. Goto BuildConfig.groovy and comment out the run portion of jvm settings:
//run: [maxMemory: 768, minMemory: 64, debug: false, maxPerm: 256, forkReserve:false],
3. Click on debug icon
Problem 3: Tomcat does not start and ends up with error
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/project1]]
This one was a real tough nut to crack, because of an accidental mistake. Tomcat refused to start, and I didnt know what setting I had really changed.
It turns out that in the Edit Configurations… window, I had accidentally turned on the “Add –classpath” checkbox. This added the maven related servlet-2.5 api classes, that gave the above error. I was hunting the wrong path for quite sometime (switching between 2.5 and 3.0, clean-all, refresh-dependencies) and several other guesses. Finally when I turned off this checkbox, the application started fine.