Skip to main content

Initializing static fields of Spring beans

New Solution - Updated 4/16/2017

The old solution shown below is very cumbersome. So here is the new solution which is much easier.

Old solution

This solution is courtesy Chris Harris UK.
  • Step 1: Create a bean factory post processor. 
  • Step 2 : Create the simple test class
Step 3 : Finally wire up everything in Spring configuration file

Comments

Popular posts from this blog

Why do you need Spring Cloud Config server?

Last month I wrote a primer on concepts around 12 factor app. Before getting into the details of the Spring Cloud Config Server, I must refresh on the principle #3 from the list presented in that post.

3 – ConfigurationStore config in the environments
Configuration information must be separate from the source code. This may seem so obvious, but often we are guilty of leaving critical configuration parameters in the scattered in the code. Instead, applications should have environment specific configuration files. The sensitive information like database password or API key should be stored in these environment configuration files in encrypted format.
 The key takeaways from this postulate for a cloud-native microservices application are:
Do not store configuration as part of the deployable unit (in the case of lead microservice - inside the jar or war if you are still deploying war like the good old days). Instead, store it in an external location and make it easily accessible during run-…

Upgrading Lead Microservice - Use MariaDB and Flyway with Spring Boot

So far I have been using an in-memory H2 database or Mockito for testing the lead microservice. To make the transition towards using the Spring Cloud Config server, I need to upgrade the micro-application to use MariaDB. I will be adding the configuration in the application.yml  the file which in the subsequent post will move over to the config server store. I will also be using Flyway to make it easy to maintain the database schema changes in future. I will use this post to introduce Flyway in the mix. Spring Boot also provides first class integration with Flyway. I am using Flyway as its really quick and easy to get started, minimal learning curve (no DSL) and I am comfortable with it having used it in the past.

Assumptions

MariaDB 10 is installedBasic familiarity with FlywayHeidi SQL client is installed.
Step 1 - Update build.gradle to include the MariaDB JDBC and Flyway dependencies.
Do not forget to do a Gradle refresh on your IDE (I am using STS 3.8.4 on Java 8)

Step 2 - Rename the…

Part 3 - Integrating Tiles, Thymeleaf and Spring MVC 3

In this post I will demonstrate how to integrate Apache Tiles with Thymeleaf. This is very simple. The first step is to include the tiles and thymeleaf-tiles extension dependencies. I will include them in the pom.xml. Note we wil lbe using Tiles 2.2.2Listing 1 - parent/pom.xml --- thymeleaf-tiles and tiles dependencies <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
<!-- Tiles -->
<!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->

<dependency>
<groupId>org.apache.tiles</groupId>
<artifactId>tiles-core</artifactId>
<version>${tiles.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.tiles</groupId>
<artifactId>tiles-template</artifactId>
<version>${tiles.version}</version>
<scope>compile</scope>