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Spring Integration Custom Transformer Example

1. Introduction Spring Integration provides a transformer mechanism to convert message payloads from one form to another between two channels. In this article, we will see how to implement a simple custom transformer. 2. Application The application is a Spring Boot application in which a Map is sent to a message channel. A Spring Integration Transformer listens to the message ...

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Android Web App Example

Nowadays, mobile applications are trending so much that, most of the websites have their Android application. Android made it so simple that one can convert their websites to application or can open web page in their application by using WebView. This tutorial walks you through the concept usage ant its implementation. Table Of Contents 1. Introduction 2. Methods & Description ...

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Java 8 Convert a String to LocalDate Example

Hello readers, in this tutorial, we will learn how to convert a given response string into a java.time.LocalDate object. 1. Introduction These days in the programming universe Date and Time handling are the most time-consuming tasks in Java. In the ancient Java world, developers were dependent on the complex SimpleDateFormat class to convert and format the Date strings into the ...

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Java 8 Filter Null Values from a Stream Example

Hello readers, in this tutorial, we will learn how to filter the null elements from a Stream in Java. 1. Introduction Java Stream is a sequence of elements that support the sum operations. In streams, the elements are reckoned on demand from different data sources such as Collections, Arrays or I/O resources and thus the elements are never stored. Streams ...

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Java 8 Map Sorting Example

Hello readers, in this tutorial, we will learn how to Sort a Map using Java8 Stream’s API and Lambda expression. 1. Introduction These days in the programming universe sorting a map is one of the most habitual tasks in Java. In the ancient Java world, developers could sort a Map either by its keys or values. In Java8, JDK developers ...

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Log4j Priority Example

This article is a tutorial about log priority levels in Log4j. In this tutorial, we are going to configure log4j via property files. 1. Introduction Log4J (Java) is a widely used logging framework for Java. It continues to grow continuously with the recent upgrade to Log4j2. Log4j supports logging via Logger, Appender and Layouts. Logger is the interaction point for ...

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ByteCode primer for Java Class Files

It is often stated that to be good at the programming language you code in, one should at least dig and understand one abstraction level lower than the one in which you are coding. For Java, that would be the JVM, which would imply byte code. In this article we will kick start our adventures in Java byte code. Byte ...

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Spring Boot Logging Example

Looking to learn about Spring Boot Logging? Read this example, it is very straight forward and simple. 1. Assumptions This article assumes that you know your way around Eclipse. You are familiar with Maven. This project has been created using Eclipse Mars so all instructions are based on this IDE. This article uses the code base from the Spring Boot ...

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JAX-WS Callback Example

1. Introduction Java Architecture for XML Web Services (JAX-WS) is a Java programming language for creating web services, particularly SOAP services. JAX-WS provides both Callback and Polling mechanisms to invoke web services asynchronously. In Callback mode, the client provides a callback handler to accept and process the inbound response object. In this example, I will demonstrate how to invoke a JAX-WS ...

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Java 8 Read a File Line by Line Example

Hello readers, in this tutorial, we will learn the Java8 Stream’s API for reading a file’s content line-by-line and we will explore its different characteristics. 1. Introduction These days in the programming universe reading the file content is one of the most habitual files manipulation task in Java. In the ancient Java world, the code to read the text file ...

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