Over a million developers have joined DZone.

Grails Goodness: Skip Bootstrap Code

DZone's Guide to

Grails Goodness: Skip Bootstrap Code

Learn how you can skip the execution of Bootstrap classes in your code with a simple system property.

· Java Zone ·
Free Resource

Download Microservices for Java Developers: A hands-on introduction to frameworks and containers. Brought to you in partnership with Red Hat.

Grails normally will run any *Bootstrap classes at startup. A Bootstrap class has an init and destroy closure. The init closure is invoked during startup and destroy when the application stops. The class name must end with Bootstrap and be placed in the grails-app/init folder. Ever since Grails 3.2, we can skip the execution of Bootstrap classes by setting the Java system property grails.bootstrap.skip with the value true.

In the following example Bootstrap class, we simply add a println to see the effect of using the system property grails.bootstrap.skip:

// File: grails-app/init/mrhaki/Bootstrap.groovy
package mrhaki

class Bootstrap {
    def init = { servletContext ->
        println "Run Bootstrap"

    def destroy = {

First, we build the application, and then start it from the generated WAR file:

$ gradle build


Total time: 22.235 secs
$ java -jar build/libs/sample-app-0.1.war
Run Bootstrap
Grails application running at http://localhost:8080 in environment: production

Next, we use the Java system property grails.bootstrap.skip:

$ java -Dgrails.bootstrap.skip=true -jar build/libs/sample-app-0.1.war

Notice the println statement from Bootstrap.groovy is not invoked anymore.

Download Building Reactive Microservices in Java: Asynchronous and Event-Based Application Design. Brought to you in partnership with Red Hat

grails ,java ,bootstrap

Published at DZone with permission of

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}