Scala

Previously we had an introduction to sbt, its default tasks and how to add extra tasks. Play comes with the sbt console. The SBT console is a development console based on sbt that allows you to manage a Play application’s complete development cycle. Let us create a play application using sbt and see the commands provided. sbt new playframework/play-scala-seed.g8 [warn] ...

Sbt is the de facto build tool in the Scala community. Being used to other build tools you will be familiar with the commands clean – Deletes files produced by the build, such as generated sources, compiled classes, and task caches. compile – Compiles sources test – Executes all tests package – Produces the main artifact, such as a binary ...

Once getting your hands into typing scala code using play, the first thing that comes to mind is JSON. Without doubt JSON is one of the most basic components of web applications. Rest apis use json, your angular app has to consume json and the list goes on. If you are lazy like me, you expect that it is sufficient ...

Today’s modern application frameworks come with apromise of easy sql data access. There is no wonder why we have so many frameworks that make it easier to issue queries and handle transactions. SQL is the lingua franca of most applications when it comes to databases. Play comes with the JDBC plugin. We encountered the JDBC plugin previously in order to ...

I am certainly late with jumping on the trendy train, but today we are going to talk about GraphQL, a very interesting approach to build REST(ful) web services and APIs. In my opinion, it would be fair to restate that REST(ful) architecture is built on top of quite reasonable principles and constraints (although the debates over that are never ending ...

Once starting your play prototype application one of the priorities is to initialize your database and also manage the database schema changes. Play provides us with evolutions. By utilizing evolutions we are able to create our database and to manage any futures changes to the schema. To get started we need  to add the jdbc dependency and the evolutions dependency. libraryDependencies ...

Today we are going to develop a simple play application using Scala. To do so we must have sbt installed to our system. Once installed we issue the command sbt new playframework/play-scala-seed.g8 Then we are presented with an interactive terminal in order to pass valuable information. name [play-scala-seed]: PlayStarter organization [com.example]: com.gkatzioura scala_version [2.11.8]: scalatestplusplay_version [2.0.0]: play_version [2.5.13]: Then let ...

To those who are regular visitors of this blog, it is well known that when it comes to developing code I am a Spring/Java guy. Also I use different technologies like node or python but this depends largely on the project’s needs. Due to some recent projects and courses involving Spark, stumbling on Scala was inevitable. After some investigation I decided ...

Previously we set up a Scala implemented storm topology in order to count words. What comes next is uploading our topology to HDInsight. So we shall proceed in creating a Storm topology on HDInsight.               Then we choose the instance types. Next step is to upload our jar file to the head node in ...