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  • Official Web Layer documentation
  • Grails also supports converting haml templates files ( haml) to gsp, reducing much of the html bloat

Pass gsp data to javascript:

var ary = ${fields.encodeAsJavaScript()};

Returning json or other static values

def result = "json or static string" 
render result 

Client Side Validation

Grails can use the jquery client side validation:

compile ":jquery-validation-ui:1.4.9"


JDBCTemplate in Grails

Adding Spring's JDBCTemplate support to your grails appliation is really quite painless. This covers adding JDBCTemplate to a test class but this can be extended to any area of the application Edit the file conf\spring\resources.groovy so that it contains the following:

import org.springframework.jdbc.core.JdbcTemplate
import org.apache.commons.dbcp.BasicDataSource
// Place your Spring DSL code here

beans = {
// uses the grails dataSource from DataSource.groovy
jdbcTemplate(JdbcTemplate) {
   dataSource = ref('dataSource')

// use a different datasource
otherDataSource(BasicDataSource) {
   driverClassName = "com.mysql.jdbc.Driver"
   url = "jdbc:mysql://localhost:3306/otherDatabase"
   username = "uname"
   password = "pass"

otherJdbcTemplate(JdbcTemplate) {
   dataSource = otherDataSource

Then allow dependency injection to do its work by putting the following at the top of the test class:

class someTests extends GroovyTestCase {
   def jdbcTemplate
   def otherJdbcTemplate

and finally create a test something like this to exercise the template: void testJdbcTemplate() {

def myResult = jdbcTemplate.queryForList("select * from table1")
def myOtherResult = otherJdbcTemplate.queryForList("select * from table2")
println "myResult size : ${myResult.size()}"
println "myOtherResult size : ${myOtherResult.size()}"
=== Grails Elastic Search ===
* plugin can uses the query dsl [[ | ES Query Dsl]]
== Grails and Ajax == 
* Introduction [[ | grails ajax]] tutorial 

It can be broken down into the following taglibs 

* remoteLink – create an AJAX based link
* remoteFunction – create a javascript code that fires an AJAX request
* remoteField – creates a text control field that fires an AJAX request when the value changes
* formRemote and submitToRemote – tags to make a form serialize it’s values and submit using an AJAX request.

== Grails Plugins == 

grails create-plugin simple

This will create a plugin project which can then be packaged with package-plugin:

grails package-plugin

and installed into Grails applications with install-plugin:

grails install-plugin ../

More details on creating plugins

Grails and Hsqldb

  • add runtime 'hsqldb:hsqldb:' in BuildConfig.groovy
  • set driverClassName = “org.hsqldb.jdbcDriver” in Database.groovy
  • Specify connection url according to your requirements, e.g.: “jdbc:hsqldb:mem:devDB” - to use in-memory DB,
  • or “jdbc:hsqldb:file:prodDb;shutdown=true” - to use file based server

Adding Font Awesomeness

There is a plugin however to add manually is pretty simple (with 2 tricks)

  • Extract the css and font files to the webapp/css and webapp/fonts folders
  • edit the css to remove the ?v4.1.0 version info
  • update the resouces in config.groovy
    grails.resources.adhoc.includes = ['/images/**', '/css/**', '/js/**', '/plugins/**', '/fonts/**']

Config and Services

It seems by default the grailsApplication.config is not available on service construct. @PostConstruct doesn't help however InitializingBean does work:

class QueueJmxService implements InitializingBean {
    def grailsApplication
    def j4pClient;
    def urlStr

    public void afterPropertiesSet() throws Exception {
        println "post construct " +  grailsApplication.config

Changing the default war name

Edit your grails-app/conf/BuildConfig.groovy and add this line:

grails.war.destFile = 'cylo.war'


wget -c --no-cookies --header "Cookie:"

Copy the downloaded file to : /usr/java And extract using tar -xvf jdk-7u9-linux-i586.tar.gz

Setup alternative mappings for java

sudo  /usr/sbin/update-alternatives --install "/usr/bin/java" "java" "/usr/java/jdk1.7.0_09/bin/java" 40
sudo  /usr/sbin/update-alternatives --install "/usr/bin/javac" "javac" "/usr/java/jdk1.7.0_09/bin/javac" 40

then set the alternatives

sudo  /usr/sbin/update-alternatives --config java
sudo  /usr/sbin/update-alternatives --config javac

Stopping grails


Docker Grails

docker run -i -t -p 8080:8080 --rm -v $PWD:/app onesysadmin/grails grails
grails.txt · Last modified: 2015/03/05 03:58 by root
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