Objective: loading a value in the template from the messages.properties file.

Start from the following: 

-bash-4.2$ tree
.
+-- pom.xml
+-- src
    +-- main
        +-- java
        |   +-- com
        |       +-- example
        |           +-- demo
        |               +-- HomeController.java
        |               +-- SpringBoot03Application.java
        +-- resources
            +-- messages.properties
            +-- templates
                +-- hometemplate.html

8 directories, 5 files
-bash-4.2$ pwd
/u/dgerman/apache/htdocs/spring-boot/fall2019/step03
-bash-4.2$
To build and run:
  1. mvn package

  2. java -jar target/demo-0.0.1-SNAPSHOT.jar --server.port=31415

Again, please be sure to use your own port number.