Use Junit 5 in Spring Boot version 2.1.x
Some of the older versions of Spring boot supports Junit 4 (with Junit 5 dependencies as well). If you want to use Junit 5 in in your spring boot …
@RequestHeader annotation in Spring Boot
@RequestHeader annotation is used to bind a request header to a method argument in a controller. In other words, it allows us to read http headers in …
How to disable async operation for specific test cases in Spring Boot
I was facing a challenge with running test cases that include async methods in my Spring Boot application. The test cases failed because the async …
How to change running port in spring boot?
There are 3 ways to change default running port in spring boot application: By default, the embedded server starts on port 8080. 1- Use Property files …
What spring boot version am I using?
It is so easy to learn your spring boot version. To learn that you have to look at the following files (according to project tool you are using): If …
Integrate Google reCAPTCHA v3 into Spring Boot and Vue 3 (Nuxt 3)
Integrating Google reCAPTCHA v3 with spring boot applications can greatly enhance security and protect against malicious activities, such as spam and …
Pattern Matching and Template Verification in Java: Ensuring Text Consistency
Let’s assume that you have the following message template in which clients send the text with the correct parameter. Here is the template: …
Creating entity with includes nested data structures in Hibernate 6 (and in Spring Boot 3)
Sometimes your entity might need store nested data structures such as Map<String, Map<String, String> or list of list etc.. If you want to …
Modern Spring Boot v3 with Thymeleaf, TailwindCSS and AlpineJS
In this tutorial, we will integrate Spring MVC with gulp and webpack. As you know creating Spring MVC project with Thymelaef project is so easy. But …
How to paginate and sort for join queries in Spring Boot
Let’s say you have two entities which has many-to-one relationship and you want to paginate your query on the parent side with additional colums …
Create simple hash map with expiration(time-to-live) feature
You want to add & use simple cache in your application via hash map, but also you want your cache to remove automatically expired …
Threads in Java
Like people, computers can multitask. They can be working on several different tasks at the same time. A computer that has just a single central …
How to use cache in Spring Boot applications without annotation(s)
Almost every blog(s) on the Internet for caching operation in the Spring Boot are using @Cacheable, @CacheEvit, @CachePut vs… In this blog we …
How to read properties file only once in the Spring Boot application
Do you want to know how to read specific properties file according to the environment variable in Spring boot? Let’s explore how to read …
Java 8 Date and Time API in one tutorial
Even we have Java 17 version right now, industries still are using Java 8 & 11 even old ones using Java 6. Also many of these industries are using …
How to create sitemap.xml controller in Spring Boot
Let’s quickly learn how to generate sitemap.xml endpoint for your spring boot project. We will create a sitemap controller to handle sitemap.xml …
How to create robots.txt controller in Spring Boot
Let’s learn how to create robots.txt file for your spring boot or spring mvc project. Having robots.txt file tells search engine crawlers, such …
How to catch all exceptions in Spring Boot
In this quick tutorial, let’s learn how to catch all exception(s) in Spring Boot. And most probably you want to return customized exception when …
Spring Boot OAuth2, Postgresql, Thymeleaf with Form based Authentication
Let’s implement oauth2 practical implementation with Spring Boot using PostgreSQL and Thymeleaf. In this application: We will use PostgreSQL to …
Spring Boot OAuht2 Reason for /oauth2/authorization/{id}
Do you know the reason why redirect URL should be http://localhost:8080/login/oauth2/code/google when we setup Authorization Server in the …
Spring Boot OAuth 2 Implementation with Thymeleaf
In this article, we will implement a basic single sign on application using Spring boot. We will use Thymeleaf for html pages A single sign-on (SSO) …
Spring Boot with OAuth2 - Theory
In this post, we are going to learn what the oAuth2 is, how to use OAuth2 in Spring boot. We will start with why do we need a OAuth2, we will look at …
JPA Fundamentals & Hibernate - 13) Entity Lifecycle Events (Final)
In this article, we are going to learn lifecycle events in the JPA. As of the most application we will have date_created and last_modified column to …
JPA Fundamentals & Hibernate - 12) JPQL and Queries
In this article, we will learn what is the JPQL(The Java Persistence Query Language) and how to use it. What is the JPQL The Java Persistence query …
JPA Fundamentals & Hibernate - 11) Entity Manager
In this article, we are going to discuss what is the entity manager in the JPA and also learn the basic operations in the entity manager How to Obtain …
JPA Fundamentals & Hibernate - 10) Inheritance Strategies
In this article, we are going to look how to represent the inheritance relationship in the JPA and how to use @MapperSuperclass annotation Github Link …
JPA Fundamentals & Hibernate - 9) AssociationOverride
In this article, we are going to learn how to create relationship using @Embeddable & @Embedded object . @AssociativeOverride is used to override …
JPA Fundamentals & Hibernate - 8) Many To Many Relationship
In this post, we are going to learn how to create many-to-many relationship in JPA. Github Link If you only need to see the code, here is the github …
JPA Fundamentals & Hibernate - 7) One To Many & Many To One Relationship
In the OneToMany setup, Many sides must have the foreign key and it is the owner of the relatonship Github Link If you only need to see the code, …
JPA Fundamentals & Hibernate - 6) One To One Relationship & Cascade Operation
In this article, we are going to learn how to construct a one-to-one relationship between entities in the JPA and when to use Cascade operation Github …
JPA Fundamentals & Hibernate - 5) Composed Keys
In this article, we are going to find out how to create composite keys in JPA. Composite key is the key which composed of multiple columns. Github …
JPA Fundamentals & Hibernate - 4) @Embeddable and @Embedded
In this post, we are going to learn when and how to use embaddable object in Java and JPA. Github Link If you only need to see the code, here is the …
JPA Fundamentals & Hibernate - 3) @Enumareted, @Temporal and Date Types
In this post, we are going to learn @Enumarated and @Temporal annotations, how to store enums as ordinal and string and when to store enum types to …
JPA Fundamentals & Hibernate - 2) @Id generation
In this post, we are going to find out “what are the options to provide automatic Id generation instead of setting manually”. We will look …
JPA Fundamentals & Hibernate - 1) Entities and Context
In this series, we are going to learn the JPA fundamentals and we are going to use one of its implementation Hibernate. Before diving into the series, …
Spring Boot JWT Setup with Frontend (VueJs)
In this post, we are going to setup spring boot rest project with using JWT. we will also integrate the our spring boot application with the frontend …
Find Client's Location In Spring Boot with IP2Location and Update via Scheduling
In this tutorial, we are going to find location of your clients using spring boot and IP2Location and also we will look at how to update IP2Location …
Spring Security -- 9) Spring Security CORS Setup
In this post, let’s find out what is the CORS policy, how to implement in the Spring Boot and Spring Security, finally how to resolve most …
Spring Security -- 8) Spring Security CSRF Attack Simulation & CSRF Setup and Customization (Cross-Site Request Forgery)
In this post, we are going to learn what CSRF(or XSRF) attack is, how to simulate csrf attack in spring and how to setup csrf protection in spring …
Spring Security -- 7) Security Context and Security Context Holder
In this post, let’s find out what the Security Context is I am going to use the project that I have implemented in the previous post. Here is …
Spring Security -- 6) Multiple Authentication Filters && Providers
In this post, let’s implement two steps authentication mechanism. This will be similar to JWT authentication but instead of JWT I will use my …
Spring Security -- 5) Filter Chain, Custom filter and Authentication
Let’s look at the Filter Chain, more specifically AuthenticationFilter in the Spring Security. And also I am going to implement custom filter. …
Spring Security -- 4) Implementing Custom Authentication Provider
In this post, I am going to answer to this question “what is the Authentication Provider” and I am going to implement a project includes …
Spring Security -- 3) UserDetailsManager, JdbcUserDetailsManager and BCryptPasswordEncoder
In this post, let’s look at the what UserDetailsManager is, differences between UserDetailsService. And also I am going to implement a project …
Spring Security -- 2) UserDetailsService
In this post, I am going to use real database to check the user against the request(s). Github Link If you only need to see the code, here is the …
Spring Security -- 1) Basic Concepts
In these short series , I am going to dive into what Spring Security is, how Spring Security works. Most of the example application would be for web …
Aspect Oriented Programming(AOP) with Spring Boot Example - 2
This is the second post for a short series of aspect oriented programming with the spring boot. In this post, I am going to implement a simple project …
Aspect Oriented Programming(AOP) with Spring Boot - 1
In this post, we are going to look at what is AOP and how your spring application matches with AOP concepts using Spring AOP module. After that we are …
Regex in one blog
In this post, we are going to learn Regex expression in one blog Let’s start with defining what is Regex or Regex expression. What is Regex? …