Spring is a popular open-source Java-based framework for developing enterprise applications. It was first developed by Rod Johnson in 2003 and has since become one of the most widely used Java frameworks, with millions of downloads and numerous high-profile projects using it. Key Features Here are some key features of Spring Framework that make it…
Read More What is Spring FrameworkRunning a Spring Boot application in a Docker container is a great way to package and deploy your application. By packaging your application in a Docker container, you can easily distribute it to other machines and ensure that it runs in the same environment on each machine. In this blog post, I will show you…
Read More Run Spring Boot Application in Docker with ProfileSDKMAN is a tool that allows developers to easily manage multiple versions of software development kits (SDKs) on their system. It allows developers to switch between different versions of the same SDK, making it easy to test their code on different versions of the platform. To get started with SDKMAN, you will first need to…
Read More SDKMAN Tutorial for BeginnersThis tutorial will teach you how to implement Role-based access control in the new Spring Authorization Server. You will learn how to add a user role to a JWT token issued by Spring Authorization Server and configure Spring Resource Server to secure access to the API endpoint based on a user role. 1. Create, Run…
Read More Role-based Access Control in Spring Authorization ServerIn this tutorial, you will learn how to check if a Java string is empty, null or consist of a whitespace character. To learn more about Java, please check the Java category page. Let’s start with a simple example that checks if String is null. Check If Java String is Null If a String variable…
Read More Check if Java String is Empty, Null or WhitespaceThis tutorial will teach you how to split a string in Java. There is more than one way to split a string, so we will look at several ways. Let’s start with a very basic one. Split a String To split a string in Java, you can use a String class’s split() method. The split()…
Read More How to Split String in JavaIn this tutorial, you will learn how to convert an image byte[] array into a Base64 encoded string of characters. Additionally, you might be interested in checking the “Converting byte[] Array to String in Java” tutorial. Convert Image to a byte[] Array Let’s assume that we have an image on our computer. Our task is to…
Read More Convert Image byte[] Array to Base64 encoded String in JavaThis tutorial will teach you how to convert an array of bytes to a string of characters in Java. Additionally, you might be interested in learning how to convert an image/file byte[] array to a Base64 encoded String. If you are, then check the following tutorial. How to Convert Image byte[] Array to Base64 encoded…
Read More Converting byte[] Array to String in JavaIn this tutorial, you will learn how to round a Float or a Double value to 2 decimal places in Java. 1. Using BigDecimal One of the ways to round a float or a double value is to use BigDecimal class. BigDecimal bigDecimalDouble = new BigDecimal(doubleValue); BigDecimal class allows us to set a scale and…
Read More How to Round Float or Double in JavaThis tutorial will teach you how to convert a String value to an int value in Java. Convert String to int To convert String value to an int value, you can use Integer.parseInt() function. The parseInt() method accepts a String value as a parameter and returns an int value as a result. Successful conversion public…
Read More How to Convert String to int in JavaIn this tutorial, you will learn how to use TestRestTemplate to get a list of objects. If you are also interested to learn how to send an HTTP POST request, then please have a look at the “TestRestTemplate HTTP Post Example” tutorial. Maven Dependency To use TestRestTemplate in your Spring Boot project, you should have the…
Read More Get List of Objects with TestRestTemplateThis tutorial will teach you how to use TestRestTemplate to send HTTP Post requests. If you are also interested to learn how to send an HTTP GET request, then please have a look at the “Get List of Objects with TestRestTemplate” tutorial. What is TestRestTemplate? TestRestTemplate is HTTP Client that you use for Spring Boot…
Read More TestRestTemplate HTTP Post ExampleIn this tutorial, you will learn how to get the port number on which your Spring Boot application is running. Whether it is a defined port number or a random port number. Let’s start learning how to get the running port number first. @LocalServerPort Annotation If your Spring Boot application is configured to start on…
Read More Get the Random Port Number in Spring BootIn this tutorial, you will learn about @SpringBootTest annotation. You will use this annotation to write Integration Tests for your Spring Boot application. @SpringBootTest annotation is used to create a Spring Application Context that will be used during the test. It will make Spring Framework scan your application classes and look for different annotations. Depending…
Read More @SpringBootTest Annotation ExampleWhen we do integration testing of our Spring Boot application we sometimes need to make it load alternative configuration. For example, we might need to run and test our application on a different port number, make it connect to a database as a different user or even make it connect to a different database. In…
Read More @TestPropertySource Annotation Example