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Java Code Geeks

  • Game Theory – The Secret Weapon of Blockchain Developers
    by Eleftheria Drosopoulou
    The world of blockchain technology is a complex ecosystem built on trust and collaboration. But beneath the surface lies a fascinating layer of strategic decision-making – a layer powered by the principles of Game Theory. For developers, understanding game theory isn’t just a theoretical exercise; it’s a secret weapon that unlocks the power to: Design […]
  • The Ultimate Guide to Proxy Servers: Benefits, Types & Dev Examples
    by Eleftheria Drosopoulou
    In the vast world of networking, proxy servers act as silent guardians, mediating communication between clients (like your web browser) and servers on the internet. This guide unlocks the secrets of proxy servers, exploring their benefits, different types, and even providing developer examples to illustrate their power. Whether you’re a seasoned developer or just starting […]
  • Receiving PostgreSQL Push Notifications with Spring Integration
    by Ashraf Sarhan
    1. Introduction In modern applications, real-time updates and notifications play a critical role in keeping users informed and engaged. PostgreSQL, a powerful relational database, supports a feature called push notifications that allows applications to receive immediate updates when certain database events occur. In this article, we’ll explore receiving postresql push notifications into your Spring Integration […]

Java Revisited

  • Top 20 Spring and REST Interview Questions Answers for Java/JEE Programmers
    by javin paul
    Hello guys, I have been sharing a lot of REST with Spring tutorials from last a couple of weeks and today, I am going to share some of the frequently asked Spring and REST interview questions to Java developers applying for Web developer roles. Since Spring Framework is the most popular and the standard framework […]
  • Top 5 Books to Learn Spring framework and Spring MVC for Java Programmers
    by javin paul
    Spring and Spring MVC is one of the most popular Java frameworks, and most of the new Java projects use Spring these days. Java programmer often asks questions like which books are good to learn Spring MVC or the best book to learn Spring framework etc. If you are looking for the best Spring Framework books, […]
  • How to POST JSON request from Linux to test RESTful Web Services? Example
    by javin paul
    Even though, Postman is a great tool and chrome plugin to test RESTful Web services for Java developers, I often find myself using "curl" or "cURL" command in Linux for testing RESTful Web Services, particularly Java web services built using Spring or Spring Boot framework. The curl command is easily available on most of Linux […]
  • Role based Access control using Spring Security and MVC, Mapping LDAP Groups to Authorities for Authorization
    by javin paul
    Authentication and Authorization is an integral part of any Java enterprise or web application. Since most of the company uses LDAP Active directory for authentication, authorization, and Role-based access control (RBAC), it's good to know How to implement Role-based access control using Spring MVC and Spring Security. This is the second part of my articles […]
  • 3 ways to solve java.lang.NoClassDefFoundError in Java J2EE
    by javin paul
    I know how frustrating is to see "Exception in thread "main" java.lang.NoClassDefFoundError" while running your Java application. This is one of the dreaded problem in Java  which is also a manifestation of NoClassDefFoundError in Java. I have seen it a couple of times and spent quite a lot of time initially to figure out what is […]