Try-with-resource or “I will never forget to close a resource resolver”

best practice 1 Minute

In Java 7 the idiom “try-with-resource”  has been introduced in the java world. It helps to never forget to close a resource. And since Sling9 (roughly 2016) the ResourceResolver interface implements the AutoCloseable marker interface, so the try-with-resource idiom can be used.

That means, that you can and should use this approach:

try (ResourceResolver resolver = resourceResolverFactory.getServiceResourceResolver(…)) {
  // do something with the resolver
  // no need to close it explicitly, it's closed automatically
}

With this approach you omit the otherwise obligatory finally block to close the resource resolver (which can be forgotten …).

This approach helps to reduce boilerplate code and eliminates some potential for errors. If you are developing for AEM 6.2 and newer, you should be able to use it.

Published by Jörg

Jörg works since more than 12 years with CQ5/AEM, first as an architect in Adobe's consulting organisation, later as a Site Reliability Engineer in the AEM as a Cloud Service business. He has a focus on operation, stability and performance of AEM, and likes to share his knowledge to the broader community.

Published

2 thoughts on “Try-with-resource or “I will never forget to close a resource resolver””

    1. Hi David,

      .adaptTo() is not listed as one of methods opening a ResourceResolver, thus you should not close it.

      — Jörg

Comments are closed.