Groovy - Tag - Simon Jakubowskihttps://sijakubo.github.io/info/tags/groovy/Groovy - Tag - Simon JakubowskiHugo -- gohugo.ioensijakubo@gmail.com ( Simon Jakubowski)sijakubo@gmail.com ( Simon Jakubowski)Wed, 01 Apr 2026 00:00:00 +0000Create Shapefiles from GeoJSON in Java with shapefile-creatorhttps://sijakubo.github.io/info/posts/post-13/Wed, 01 Apr 2026 00:00:00 +0000sijakubo@gmail.com ( Simon Jakubowski)https://sijakubo.github.io/info/posts/post-13/shapefile-creator is a lightweight library that converts GeoJSON into ESRI Shapefiles.

That is especially handy when GeoJSON is the exchange format in your application, but a downstream GIS workflow still expects a Shapefile export.

The key point is: you do not need anything else for that export. No additional GIS server, no heavyweight conversion toolchain, and no external desktop tooling in your application runtime. Just this library.

The library is published on Maven Central, so integration into existing Java or Groovy projects is straightforward.

]]>Groovy 3 Release Note Hightlightshttps://sijakubo.github.io/info/posts/post-3/Fri, 09 Jul 2021 00:00:00 +0000sijakubo@gmail.com ( Simon Jakubowski)https://sijakubo.github.io/info/posts/post-3/I’m a huge Fan of groovy and therefore always excited about new additions and changes to the groovy lang. Therefore, here’s a list of my personal highlights of the groovy 3 release.

The complete release-notes can be found here: Groovy 3 Release Notes:

!in Operator

4 !in [5, 6, 19] // true

!instanceof Operator

LocalDate.now() !instanceof Temporal // false
LocalDate.now() !instanceof Instant // true

?= Elvis Operator

def last = null
last ?= 'Doe'
last == 'Doe'

=== and !== Identical Operators

def emp1 = new Employee(name: "Simon Jakubowski")
def emp2 = new Employee(name: "Simon Jakubowski")
def emp3 = emp1

emp1 == emp2 // true
emp1 === emp2 // false
emp1 === emp3 // true

safe map, list, array access

def emps = [
  "boss"     : ["joe"],
  "developer": ["sja", "sro", "tti"]
]

emps["boss"] // ["joe"]
employees["boss"] // throws NPE
employees?["boss"] // null

Support for lambda expressions + Method References

["test", "arba"]
  .stream()
  .map(String::toUpperCase)
  .collect(Collectors.toList())

Reduction of the main groovy package

org.codehaus.groovy:groovy:3.0.8
org.codehaus.groovy:groovy-json:3.0.8
* groovy.json.JsonSlurper
org.codehaus.groovy:groovy-xml:3.0.8
* groovy.xml.XmlSlurper
]]>