Java Tutorials and Best Practices
Managing the configuration of microservices in a distributed system has been a tedious and time-consuming task especially if we’re talking about huge systems which consist of considerable amount of microservices. Each time you need to change the configuration of a microservice, you would go to the corresponding project, change its configuration and then restart the application for the change to...
In this tutorial we show how Spring Boot serves static resources like (html, js, css) in a web application. 1- Default path for static resources By default Spring Boot serves static resources defined under the following paths: /META-INF/resources/ /resources/ /static/ /public/ Except for index.html which is served as the root resource when accessing the root URL of a Spring Boot application,...
#Problem When redirecting back to your application after a successful OAuth2 authentication, the following error occurs: #Solution This error occurs when the redirect URL set under the authorization service(Google, Facebook … etc) is not defined as a permitted URL inside your application. The permitted URL is the one which can be accessed without authentication. When the authorization service redirects to...
#Problem When trying to authenticate a user using OAuth2 through a third-party service like (Google, Facebook .. etc.), the following error occurs: #Solution redirect_uri_mismatch error occurs when the redirect URL defined for your application at the authorization service doesn’t match with the value of parameter “redirect_uri” passed by your request. When integrating OAuth2 with Spring Boot, the default value of redirect_uri...
In this tutorial we explain how to secure a Spring Boot application using OAuth2. If you follow the steps in order, you’ll get a fully working secured application which authenticates user requests through Google API. Prerequisites: Eclipse IDE (neon release) Maven 4 Java 1.8 Spring Boot 2.0.0 1- Create maven project Open eclipse then create a new maven project and...
In this tutorial we show how to create a Spring Boot application that communicates with an Oracle data source through Hibernate. Prerequisites: Eclipse IDE (neon release) Maven 4 Java 1.8 1- Create maven project Open eclipse, then create a new maven project and name it as SpringBootHibernate. At the end of this tutorial, we’ll get the following project structure: 2-...
This tutorial provides a step-by-step guide on how to build a restfull web service using Spring Boot. Prerequisites: Eclipse IDE (neon release) Maven 4 Java 1.8 1. Create maven web project Open eclipse then create a new maven web project and name it as SpringBootRest. The structure of the generated project looks like the following: 2. pom.xml After creating the web project, the...
Setting up an enterprise spring-based application has become a tedious and error-prone task due to the required bulky configuration along with the complicated dependency management especially if we’re talking about applications which make use of several third party libraries. Each time you build an enterprise spring-based application, you have to repeat the same configuration steps: Import the required spring modules...
This tutorial provides a step-by-step guide on how to build REST web service using Spring framework. Prerequisites: Eclipse IDE (Mars release) Java 1.8 Apache tomcat 8 1. Create Maven web project Create a maven web project using this tutorial and name your project as SpringRestService. The structure of the generated project looks like the following: 2. Add Spring dependencies After creating...