Used versions: GORM 6.1.9 Hibernate 5.1.5 Grails 3.3.10 This week I had to map an object on an existing database table with an existing primary key not named ‘id’ but ‘aniId’. By convention GORM is expecting such an ‘id’ property and if it is absent GORM inserts it for us which is very handy with new tables. But with an … Lees verder GORM map table without primary key
Jenkins is a very neat tool to implement a continuous delivery process, mainly due to its flexibility. Sometimes it can be hard though to keep complexity low, and when that happens, (automated) tests become far more important. Jenkins should in fact be running tests that verify the scripts running tests, proving they actually work. Warning: this dog will chase its … Lees verder Jenkins shared libraries: tested
What if you want to develop Grails 2 projects with Eclipse Neon (4.6) as easy as you did with Groovy/Grails Tool Suite? Written and tested with Eclipse Neon and Grails 2.3, 2.4 and 2.5. Disclaimer: this post is a complete copy of my awesome colleague Ted Vinke’s post about eclipse Mars of last year! Actually, this is of course only … Lees verder Eclipse Neon: Grails 2.x with Groovy and GSP Support
What if you want to develop Grails 3 projects with Eclipse Mars (4.5) as easy as you did with Groovy/Grails Tool Suite or previous Eclipse versions? Written and tested with Eclipse Mars.1 Release (4.5.1, build 20150924-1200) and Grails 3.1.0 M1.
We know it’s all too common in Java to get a NullPointerException when we use an object reference which is null. This happens when our code tries to access a method or field of an object, or element of an array when there’s no instance present – e.g. it refers to null.
1 2 3 4 5 6 | class Animal { String name Animal parent } def animal = new Animal(name: "Bella") // no parent |
We might get an Animal instance from … Lees verder Avoid NullPointerException: Safe Navigation with Groovy
Grails 3 has been released with a ton of new features. If you’re used to adding a new Grails distribution in Eclipse or Groovy/Grails Tool Suite, you’ve might have experienced that your good old IDE might not support Grails 3 projects right out of the box. You might be missing: Grails 3 support at all 🙂 Gradle support Groovy 2.4 … Lees verder Grails 3 Released: Installing Gradle and Groovy 2.4 Support in Eclipse/GGTS
Caches are difficult to get right, and difficult to maintain. To get an insight into how well the Spring method caches we are using actually work, I added some logging. Spring method caches are annotated using ‘Cacheable’. It seemed like a good idea to at least have some information on: how often a cache is hit how long the call … Lees verder Debugging caches using groovy logging
A simple test Since I wanted to have some test coverage (legacy code alert!) for my project I started out testing one of the services, a grails artefact. All was well, I’m using Spock and testing is a breeze. At some point I wanted to have another component to return a fixed value so I would have something predictable to … Lees verder Grails, private method scope and mocks
Java 8 is featuring lambdas, which are similar to a construction Groovy has already for some time: closures. In Groovy we could already do this:
1 2 3 | def list = ['a', 'b', 'c'] print list.collect { it.toUpperCase() } // [A, B, C] |
where { it.toUpperCase() } is the closure. In Java 8 we can achieve the same functionality now in a concise way.
1 | list.stream().map( s -> s.toUpperCase() ) |
Groovy’s strengths has always been the possibility to just copy ’n paste … Lees verder Groovy closures for now – no Java 8 lambdas just yet
