How to Implement Cross Cutting Concern using AOP in Scala

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In this blog, I have explained that how easily we can implement Cross Cutting Concern such as logging using Aspect Oriented Programming in Scala. These concerns have nothing to do with core business logic. Aspect Oriented Programming is used for encapsulating cross-cutting concerns into re-usable modules. Here we used AspectJ weaver to weave precompiled aspects into project output

First we defined an annotation style aspect scala code:-

This aspect will print Method, its input and result detail, when a method is entered annotated with the @Loggable annotation and finished execution.

Let’s define the @Loggable annotation Java code

Finally define a Sum class to see usage of Aspect

We also need to add META-INF/aop.xml to configure aspect weaver.


        <!-- declare existing aspects to the weaver -->
        <aspect name="com.knoldus.aspect.AnnotationBasedAspect"/>


    <weaver options="-verbose">
        <dump within="com.knoldus.*"/>


Complete source code can be found here CrossCuttingConcern_Scala.

Now run sbt test. You will see below message on console.

Method:-execution(Sum.checkSum(..)) Input:-2,3 Result:-5

Written by 

Ayush is the Sr. Lead Consultant @ Knoldus Software LLP. In his 10 years of experience he has become a developer with proven experience in architecting and developing web applications. Ayush has a Masters in Computer Application from U.P. Technical University, Ayush is a strong-willed and self-motivated professional who takes deep care in adhering to quality norms within projects. He is capable of managing challenging projects with remarkable deadline sensitivity without compromising code quality.

4 thoughts on “How to Implement Cross Cutting Concern using AOP in Scala1 min read

  1. Just curious… why not use scala macros for a case like this? It seems more appropriate and idiomatic.

  2. Does not work. I downloaded source code . Then built sbt project “sbt eclipse”. called the sum method in another method. But It ran. but Aop did not work. Do i need to configure anything else? Thank you.

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