What is the difference between Gradle and Maven?
I am new to Gradle but I used to work with maven.
When to use Gradle and When to use Maven ?
Gradle is based on a graph of task dependencies – in which tasks are the things that do the work – while Maven is based on a fixed and linear model of phases. With Maven, goals are attached to project phases, and goals serve a similar function to Gradle's tasks, being the “things that do the work.”
The biggest differences are Gradle's mechanisms for work avoidance and incrementality. The top 3 features that make Gradle much faster than Maven are: Incrementality — Gradle avoids work by tracking input and output of tasks and only running what is necessary, and only processing files that changed when possible.
Gradle is between 7 and 85 times faster than Maven when building incremental changes; benefits increase with number of subprojects. Gradle builds are 3 to 30 times faster than Maven builds when task outputs can be resolved Gradle's build cache.
Short answer: yes. There's no conflict between having two independent build scripts for the same project, one in Maven and one in Gradle.
You can think of Gradle as goodness of Ant and Maven put together minus the noise of XML. And scriptability with groovy is very big plus.
When to use Gradle and When to use Maven ?
Almost everywhere for creating java/groovy project. The build files are much terse.
With Google choosing Gradle as the new build system for Android SDK and mature libraries like Spring, Hibernate, Grails, Groovy etc. already using it to power their builds, there is no doubt that Gradle is becoming de-facto build system for the Java ecosystem.
Gradle is the next evolutionary step in JVM-based build tools. It draws on lessons learned from established tools like Ant and Maven and takes their best ideas to the next level. Following a build-by-convention approach, Gradle allows for declaratively modeling your problem domain using a powerful and expressive Domain-Specific Language (DSL) implemented in Groovy instead of XML. As Gradle is a JVM native, it allows you to write custom logic in the language you are most comfortable with, be it Java or Groovy
For more information here: Next generation builds with Gradle
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