Groovy Grails tool suite installation

Question

I am trying to pick up Grails using Groovy Grails tool suite. I tried to set up the tools to play around with Grails, unfortunately this issue which will need some advise. Please help me to resolve this problem.

These are the tools I had installed, using window 7: 1. Java JDK (jdk1.8.0_101) 2. Grails 2.3.4 3. Groovy Grails Tool Suite 3.5.1

Both Java and Grails are running fine. @cmd:

C:\Users\00Who00>java -version
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

C:\Users\00Who00>grails -version
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=32m; support
 was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; sup
port was removed in 8.0
Grails version: 2.3.4

Answer 1

Grails 2.3 doesn't work with Java 8 because of the version of Groovy it uses; you need to use a newer version that uses a version of Groovy that's compatible. Either user Grails 2.4+ (or embrace 2016 and use an even more recent version) or switch to Java 7.

Answer 2

If you're getting started with Grails and attempting to use GGTS and Grails 2.3, I suspect you might be reading Grails in Action 2nd Ed . A fantastic book! Regardless, a couple of things to note:

• Groovy-Grails Tool Suite has been discontinued for over a year, so is quite likely to have more issues
• Grails 3.x is the latest and much improved (Gradle and Spock are defaults, among many other things)

For an IDE, I suggest switching to IntelliJ IDEA. If you are using Grails 3, both Ultimate and Community editions work fine since Grails 3 uses Gradle as a build tool. I'd definitely recommend the Grails 3/IntelliJ combo for getting up to speed, even if you need to switch back to 2.3 for work purposes. Nearly all the knowledge will transfer.

Available Grails 3 resources

There are no books yet on Grails 3 specifically. Here are some of the best resources I've found.

• Grails 3 talks at SpringOne: infoq.com/conferences/springone2gx2015
• Grails 3 User Guide: docs.grails.org/latest/guide/single.html
• MrHaki's "Grails Goodness" series (which he offers compiled as a book also): mrhaki.blogspot.com/search/label/Grails%3AGoodness .

Beyond those, the Grails in Action 2nd Ed book is still very relevant and one of the best ways to get a comprehensive understanding of Grails.