Roy Tutorials

Introduction This tutorial will show you how to run PHP web applications without external server. So, you don’t need to use external server when you are developing or building your PHP based web applications in your development or local environment. I will show you here both how to run standalone PHP file and PHP web…

Introduction In this example I am going to show you Spring Security Pre-authentication hasrole with Spring Data JPA. In my another example I had shown the similar example on Spring Security Pre-Authentication with Spring JDBC Template. There are situations where you want to use Spring Security for authorization, but the user has already been reliably…

The example CodeIgniter 4 MySQL AJAX nested comment system will show you how to build a threaded comment system using PHP based web framework CodeIgniter 4, MySQL 8 and jQuery with AJAX technique. This nested comment system is also called hierarchical comment system. This threaded or nested comment system in PHP AJAX accepts reply up…

Introduction Codeigniter 4 MySQL 8 CRUD example will show you how you can build an application that performs CRUD operations using PHP based framework Codeigniter. CRUD is an acronym that stands for Create Read Update and Delete operations. It’s almost in every application that has user management system will need basic CRUD operations. Related Posts…

Introduction Here I am going to build a system to log online user activity in Spring Boot applications using HandlerInterceptor interface. As an application owner you may want to track your user activities, such as, which page they are accessing, from where requests were made to your application, from which pages to which pages they…

Introduction Here I will discuss about OWASP top 10 securities considerations in web applications. These applications could be anything from standalone to enterprise to web applications. OWASP is an acronym that stands for Open Web Application Security Project (OWASP) and it is a global community that continuously focuses on the improvement of all types of…

Introduction You might have seen the error in CodeIgniter 4: The framework needs the following extension(s) installed and loaded: curl, intl. I will show you how here to solve this problem. This problem generally you will find in PHP based CodeIgniter 4 web framework in your environment when you try to run your application using…

Introduction Here I am going to tell you how to manually move WordPress site to local server. In this tutorial I am going to show you only the manual process and I won’t use any plugin to move live WordPress site to local server. I will show you here how to move your live WordPress…

In this tutorial I am going to show you how to configure PHP, MySQL, Apache HTTP Server for developing PHP based web applications. You may create PHP based standalone applications or web based applications and you want to run them in development environment before deploying into the production or live environment. I will also show…

Introduction Apache POI is the most popular library when comes to manipulate word, excel, ppt based documents. In this example I am going to show you how to read large excel file using Apache POI library. Your large excel file may contain various kind of information, such as, Human Resource data, Sales data, Credit Cards,…

Introduction In this tutorial I am going to show you how to call Spring REST APIs concurrently using Java CompletableFuture. So basically REST service APIs will be invoked parallelly and in parallel execution the response time will be very less. I am going to show you how to call REST APIs concurrently using Java 8…

In this example you will see what are Predicate and Function functional interfaces in Java 8 or later version of Java. Functional interfaces provide target types for lambda expressions and method references. Each functional interface has a single abstract method, called functional method for that functional interface, to which the lambda expression’s parameter and return…