Groovy Goodness: Exclude Transitive Dependencies With Grape

The built-in dependency mechanism in Groovy is Grape. With Grape we can define dependencies in our code and Groovy will download them and make them available when we run our Groovy application. The easiest way to use it is with the @Grab annotation with a dependency as the value. If we want to exclude a transitive dependency we use the @GrabExclude annotation. We must specify the attributes group and module of the annotation with the dependency we want to exclude. An alternative syntax is a shorthand version where the group and module are combined into a single String value separated by a colon (:).

In the following Groovy script we have a very simple Spring application with Java (Groovy) based configuration. So we need a dependency on the spring-context module. But we don’t want to use the standard Spring logging. Spring used Apache Commons logging and we want to replace it with an SLF4J API implementation: Logback. So we use the @GrabExclude annotation to exclude the commons logging dependency. And we add two extra dependencies to replace it: org.slf4j:jcl-over-slf4j and ch.qos.logback:logback-classic.

Written with Groovy 2.4.4.

Original article

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About mrhaki

My name is Hubert A. Klein Ikkink also known as mrhaki. I work at the great IT company JDriven. Here I work on projects with Groovy & Grails, Gradle and Spring. At JDriven we focus on SpringSource technologies. All colleagues want to learn new technologies, support craftmanship and are very eager to learn. This is truly a great environment to work in. You can contact me via Google+ or @mrhaki.

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