Web server failed to start Port 8080 was already in use

In this post, We will try to understand the Web server failed to start Port 8080 was already in use error and how to fix it. Why Port 8080 was already in use? In the network, an IP address identifies each machine. Similarly, The network port identifies the application or process running on a machine. When an…

iText HTML to PDF in Java with Examples

Let’s learn how to convert HTML to pdf using java and itext pdf library. Itext PDF library lets you convert HTML to PDF documents. In this post, we will take a look at a simple example for HTML to PDF conversion. itext pdf dependencies To add support for itext-pdf dependencies, you need to add the…

Handling Date objects in Thymeleaf

In this post, We will see how to format and work with date objects in thymeleaf templates using the #dates utility with an example. Introduction Before getting in further, read a little about thymeleaf and how it can help build dynamic web applications. The #dates object in thymeleaf deals with date objects in thymeleaf model….

Using JdbcTemplate with Spring Boot

Introduction Spring Boot provides support to typical JDBC operations via jdbcTemplate. With JDBC templates, you can perform complex database operations which are not possible through JPA. Starter Dependencies JDBC templates feature is part of the Spring JDBC module. This means that either the JPA starter or the JDBC starter will bring this support. As we…

Derby Embedded Database for Spring Boot

In this post, We will see how we can use Apache Derby embedded database with Spring Boot applications with an example. Introduction Apache Derby is a pure java implementation of a relational database. Also, it complies to JDBC and RDBMS standards. For this reason, we can easily embed Derby into applications. Derby Dependencies for Spring…

Spring Boot H2 Database

Introduction Let’s learn how to use the h2 database with the spring boot application and its configuration via application properties. H2 is an in-memory database that we can embed within the application. For this reason, H2 is the right candidate for loading test data or to prototype an application. Spring Boot Dependencies Spring Boot doesn’t…

Drools Rule Engine for Spring Boot – Tutorial

Lets learn how to integrate Drools Rule Engine with Spring Boot application for business rules management with an Example. Drools is a Business Rule Engine that is based on Java Rules API. It lets you create complex applications where the business logic changes a lot post development. Introduction To Drools For example, you may run…

Spring Boot Interview Questions 2021

Let’s go through some of the important spring Boot interview questions for beginners. We gathered these questions from some of the top MNCs across the globe. What is Spring Boot? Spring Boot is an opinionated view of the Spring ecosystem and third-party libraries to kickstart an application development with ease. Spring Boot makes this possible…

Spring @Async to increase performance in 3 steps

Lets learn about Spring Boot @Async annotation and use it to achieve Async (asynchronous) method execution in Spring Boot. Introduction to @Async annotation Normally, A program would run from top to bottom. But sometimes, one operation or method may take time and it would cause other methods to wait. In these cases, it makes sense…

Comparators and equality in Thymeleaf

Even though we do not pay attention to these operations much, Comparators and equality operators are the key aspects in thymeleaf expressions. In this post, we will see how these operators can be used. Comparison Operators (Comparators) You can compare values and expressions using the >, <, >= and <= Comparators. These operators behave the same way as they would behave in most…