Two databases used by one Spring Boot application does not seem tricky. But they both are accessed through Spring Data JDBC. And then the most tutorials remains tight-lipped. Even though that is not straight forward but still possible.
Executing operations one after another is easy. However, sometimes we desire more - parallelism. Are you sure you know how to execute tasks in parallel in Java? If not, let me show you how to start multiple threads with ExecutorService, give them some tasks and wait for the result.
Active, inactive, saved, verified, sent, completed. Do they seem familiar? If so, you have had a potential use case for State design pattern. Would you like to learn it? Then, let's do it.
Memento is a design pattern that represents one of the possibilities to implement save and restore functionality.
The same application code, the same database engine but it works on one server, on another does not. Why?
- Repeating actions with Spring Retry
- Logging configuration for Spring Boot (logback)
- Cannot find ServletContextInitializer
- Google and Facebook login in one application
- Module xyz reads package org.apache.commons.logging from both commons.logging and jcl.over.slf4j
- Getting started with Single Sign On with Facebook in Spring Boot app
- Scheduling tasks in Spring
- Java Influencers about Project Jigsaw
- Testing for exceptions in Spock
- Using @ControllerAdvice to handle @Controller exceptions globally
- Use the built-in formatting to construct this argument.
- Testing arguments of method execution with Spock Framework
- Google Sign-In with Spring Security (no Spring Boot)
- Google profile details in Spring Boot application
- Getting started with Google Sign-In in Spring Boot app
- Basics of mutable and immutable classes
- Story of LazyInitializationException
- Lombok - solution for getter and setter boilerplate code
- Enabling H2 db in Spring Boot app
- Spring Boot application deployment on standalone Tomcat
- How to mock static methods
- JDBC connection strings and drivers
- Getting C/C++ performance out of Java