Deploy a Grails Application into Glassfish

Christoph Hartmann — Thu, 16 Apr 2009 15:34:04 +0000

In most cases a Grails application uses a database to store its content. Fortunately Grails is tightly coupled with GORM to ease the use. Since Grails distinguish between different deployment environments, it uses a special configuration for development and production. Therefore you have to think of a database in production environment while you don not in development stage.

Glassfish v2 and v3 Prelude comes with an internal database JavaDB (based on the Apache Derby) that could be used for first tests. It would be great to use the default database by default for deployments for Glassfish via JNDI. This article shows how to use the bundled database with an Grails application.

In preparation for the next steps you have to install Grails 1.1 and Glassfish v2 or Glassfish v3 Prelude.

To create the demo app just run the following at command line:
grails create-app glassfishapp cd glassfishapp grails create-domain-class Bookmark grails create-controller Bookmark

As the next step edit the domain class and the controller. E.g. open Eclipse with installed Groovy plugin.

class BookmarkController {
    def scaffold = Bookmark
}

class Bookmark {
    static constraints = {
    }
 
    String url
}

Now you are ready to test your app with

grails run-app

To prepare the Grails application for Glassfish the data source for the production environment has to be changed. Open the DataSource.groovy and change

production {
	dataSource {
		dbCreate = "update"
		url = "jdbc:hsqldb:file:prodDb;shutdown=true"
	}
}

production {
	dataSource {
		dbCreate = "update"
		// do not use java:/jdbc as documented
		jndiName = "jdbc/__default"
		username = "APP"
		password = "APP"
	}
}

Do not use jndiName = "java:jdbc/__default" as documented. Be aware that it may be dangerous to use dbCreate= "update" in production environments.

Now compile the web archive with

grails war

Start your database and the application server
./asadmin start-database ./asadmin start-domain

Finally open the sun web interface at http://localhost:4848/ to deploy the war file

http://localhost:8080/glassfishapp-0.1/

I experienced some memory problems by using Grails with Glassfish. To fix that problem I added -XX:MaxPermSize=256m and -Xmx1024m as JVM option. JVM options can be changed via the web interface (Common Tasks -> Application Server -> JVM Settings -> JVM Options)

Grails running in Glassfish

Groovy Programming Examples

Christoph Hartmann — Thu, 11 Sep 2008 13:16:03 +0000

Java Iteration Example

import java.util.Date;
 
public class Foo {
    public static void main(String[] args) {
        int start = 1;
        int summe = 0;
 
        for (int i = start; i <= 5; i++) {
            summe += i;
        }
 
        Date now = new Date();
        System.out.println(now.toString() + " Die Summe ist: " + summe);
    }
}

Groovy Iteration Example within Groovy Shell

 
        start = 1
        summe = 0
 
        for (i in start..5) {
            summe += i
        }
 
        now = new Date()
        println "$now Die Summe ist: $summe"

Groovy Map Handling with Closures

map = ["a":1, "b":2]
 
// inline closure
map.each { key, value ->
    map[key] = value*2
}
println map
 
// extern closure
doubler = { key, value ->
    map[key] = value*2
}
map.each(doubler)
println map

Groovy Beans

class Book {
    String title
 
    Book (String theTitle) {
        title = theTitle
    }
    Book plus(Book anotherBook) {
        return new Book(title + ", " + anotherBook.title)
    }
}
Book gina = new Book("Groovy in Action")
// getters are generated automatically 
println gina.getTitle()
 
println ((gina + new Book("Groovy for Experts")).title)

Groovy Duck Typing

 
class Dog {
    def speak() { println "wuff" }
}
class Cat {
    def speak() { println "miau" }
}
def saySomething(somewhat) {
    somewhat.speak()
}
 
saySomething(new Dog())
saySomething(new Cat())

Simple XML Example:

 
class XmlBuilder {
   def out
   XmlBuilder(out) { this.out = out }
   def invokeMethod(String name, args) {
       out << "<$name>"
       if(args[0] instanceof Closure) {
            args[0].delegate = this
            args[0].call()
       }
       else {
           out << args[0].toString()
       }
       out << ""
   }
}
 
def xml = new XmlBuilder(new StringBuffer())
xml.html {
    head {
        title "Hello World"
    }
    body {
        p "Welcome!"
    }
}
println xml.out

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Deploy a Grails Application into Glassfish

Groovy Programming Examples