[lmm]

Gradle scripts are an undocumented superset of Groovy. It's not just Groovy, it's the fact that there's no consistent way to know what settings and defaults come from where.

(And really, why would you know Groovy these days? Is it even used for anything outside of Gradle anymore?)

[humbleMouse]

Groovy is super useful for JSON mapping, objects without boilerplate, spock mock testing, etc. I love it because you can be as loosely typed or as strongly typed as you want depending on the code you're writing.

I don't see a reason to NOT use groovy in any java project. It makes java so much nicer.

[acrive]

* Easy to read * Collections tools * Functional programming with closure * Traits * Typed or not * DSL * 100% compatibility with all jars * Awesome framework like Grails and the upcoming Micronaut and SpringBoot * Enterprise software or script, you're welcome.

There is a whole world out there.

[pjmlp]

Yeah, time travel to JUG meetings 10 years ago.

Nowadays all of that is a synonym to Grails maintenance projects.

[zmmmmm]

Groovy is actually an extremely useful language to know. Something approximating bash for java, but with capability to scale up to full application development. Gradle would be one of the less important reasons to learn it imho.

[lmm]

I mean objectively it's not a bad language for its era, I just never found a compelling reason to use Gradle rather than something else. When I started out on the JVM I used Jython for scripting tasks since I already knew Python, and once I started using Scala I used that for, well, everything really.

I don't want to get too deeply into language wars, but Java, Python and Scala all have "killer" features, things they offer that no other language does - you may not agree with them but there are reasons someone might pick that language over every other language in the world. Whereas Gradle just felt like "it's a Python/Ruby/Perl-like language that runs on the JVM" - if there's something Gradle's actually the best at, their communication failed to convey it.

[zmmmmm]

> Whereas Gradle just felt like "it's a Python/Ruby/Perl-like language that runs on the JVM" - if there's something Gradle's actually the best at, their communication failed to convey it

I assume you meant groovy there. But yes, I remember actually posting exactly that view on here several years ago! I felt that if I was going to learn a JVM language, why not invest that effort in something that was more generally applicable or has broader benefits, and kill two birds with one stone? I deep dived into Scala, and looked into Jython, JRuby and other JVM languages. What I came up against every time was that each of those languages seemed to have significant impedance mismatch with the JVM. I found I really wanted something as close to Java as I could get but with a scripting programming style so that I could do quick experimental coding. For me that is where groovy beat everything else. As I used it more I started building larger projects with it because it scales up pretty well. So I often build about 70% of a project in groovy and then do 30% in Java where I want the real static typing (interfaces, domain model, etc.).

This seamless interoperabiity with Java/JVM is a fairly subtle selling point especially since every JVM language will say they do it. It's only when you try to use them in complex projects and see them fall down that you realise that groovy is the only language that is philosophically trying to be close to Java (I'm fairly keen to try Kotlin to see how that holds up on this count).

[lmm]

> This seamless interoperabiity with Java/JVM is a fairly subtle selling point especially since every JVM language will say they do it. It's only when you try to use them in complex projects and see them fall down that you realise that groovy is the only language that is philosophically trying to be close to Java (I'm fairly keen to try Kotlin to see how that holds up on this count).

Interesting - can you say anything more concrete/specific? E.g. with Scala I've gradually drifted away from a Java-like style over the years, but I found it was very possible to write in a close-to-Java style (e.g. using the Java collections rather than Scala ones, using mutable vars and null and subclasses) when that was what I wanted.

[vorg]

You could be talking about Apache Groovy's seamless interoperability with Java 7. It hasn't kept up with Java 8 and lambdas, let alone Java 9 and modules.

[zmmmmm]

It's still far more seamless with java 8 than any other language. I don't care about superficial syntax similarity, that is not really the point. Nicer interoperability with java streams would be good though.

[xirdstl]

Yes, it's of course used in Grails. I'm also a fan of Spring Boot + Groovy.