Execute around Aspect with @annotation pointcut in Spring Boot

Aspect oriented programming (AOP) is a programming model where we write independently executable code which adds additional behavior to the existing code without modifying the existing code. Wikipedia defines AOP as: In this article, I will show you how to execute certain code around the execution of a method which means I would execute some … Read more

Configure Embedded H2 Console With Spring MVC Application

In our previous post we deployed a Spring MVC app using embedded H2 database to Tomcat. Browsing the data in an embedded DB is difficult because we cannot connect an external client to view the data. H2 provides a Web console which we can enable and use this to browse the data as shown below: … Read more

How to Deploy Spring Application Without web.xml to Tomcat

Introduction Since the Servlet 3 specification web.xml is no longer needed for configuring your web application and has been replaced by using annotations. In this article, we will look at how to deploy a simple Spring-based application without web.xml to Tomcat 8.5.*. Creating an Empty Application Use the following command to create an empty web … Read more

Using Google reCaptcha with Spring Boot application

Introduction reCaptcha by Google is a library used to prevent bots from submitting data to your public forms or accessing your public data. In this post, we will look at how to integrate reCaptcha with a Spring Boot based web application Setting up reCaptcha You should create an API key from admin panel. You have … Read more

Using Gmail as SMTP server from Java, Spring Boot apps

Gmail users can use Gmail’s SMTP server smtp.gmail.com to send emails from their Spring Boot apps. For this let us do some setup in the app:

  1. Provide SMTP connection properties in the application.properties file:
    spring.mail.username=<your gmail/google app email>
  2. Use Spring Boot Email tools library – which is a wrapper over Spring Boot Email starter library.  Add the following in your pom.xml:
  3. Annotation your application’s main class (i.e class annotated with @SpringBootApplication) with @EnableEmailTools:
    public class EmailApplication {
        public static void main(String[] args){
            SpringApplication.run(EmailApplication.class, args);
  4. Let’s write a test which uses it.ozimov.springboot.mail.service.EmailService bean to send an email:
    public class EmailServiceTest {
        it.ozimov.springboot.mail.service.EmailService emailService; 
        @Value("${spring.mail.username}") String fromEmail; 
        public void testSendEmail() throws UnsupportedEncodingException { 
            User user = new User(); 
            user.setDisplayName("Mohamed Sanaulla"); 
            final Email email = DefaultEmail.builder() 
                .from(new InternetAddress(fromEmail, "From Name"))
                .to(Lists.newArrayList(new InternetAddress(
                    user.getEmail(), user.getDisplayName()))) 
                .subject("Testing email")
                .body("Testing body ...")

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Gotcha: Migrating from Spring Security 3.2.x to Spring Security 4.x

Here is a simple gotcha to keep in mind while migrating to newer Spring Security version 4.x from Spring Security 3.2.x What’s the problem? The Spring security configuration expressions hasRole(‘role_name’) and hasAuthority(‘role_name’) are no longer the same. The catch is: hasAuthority checks for any role name passed to the expression without prepending ‘ROLE_’ (which is … Read more

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