Spring provides a global exception handling mechanism that can be implemented across the whole application using @ControllerAdvice annotation

JasperReports library is an open source reporting library written in Java. The library can export documents in different formats e.g. PDF, HTML, CSV...etc. This post shows a simple example of how to export PDF document using JasperReports.

Intent is a messaging object that can be used to start app components such activity within an app or to interact with other apps. Explicit intent is used to launch a specific app component while implicit intent specifies an action that can invoke other apps able to perform the action. Here we will see how to use intent to send and receive simple data between apps.

Functions in Kotlin can be stored in variables, passed as arguments to other functions and returned from other functions. However, since Kotlin is statically typed language, functions should have a type. In this post we will see how to declare the type of a function, how to use lambda to define a function and how to define a higher order function.

Listening to a button clicks is a common task in application development. A listener is set to listen and act upon click events. OnClickListener is an interface used to listen to click events of a button or any other components of type View.

Creating a PDF file from HTML can be done using iText Java library. iText has an add-on that enables converting HTML to PDF document. This post shows how to use iText to convert HTML to PDF.

Kotlin auto-generates a field referencing a class property within its accessors "get() or set()". This field is called a backing field and it will be generated if a property uses the default accessors implementation or if one of the accessors references it through field identifier