How do I autowire Spring config in a Executable Jar using Scala? - spring

Question

I have a simple Scala executable jar, and I am trying to use Spring Dependency injection to grab configuration information.
I start with the main class like this...
object Main{
def main ( args: Array[String] ) :Unit = {
...
};
}
This seems to work fine with no config so I try adding the config. I have a simple application.yml like this
application
username: ${MY_ENV_VAR}
password: ${MY_OTHER_ENV_VAR}
I try to implement this like the following....
#Configuration
class ExportConfig {
#Value("${application.username}")
var username: String = _
#Value("${application.password}")
var password: String = _
}
#Component
class Export(){
#Autowired
var config: ExportConfig = _
def doSomething(...): String = {
val obj = new DoSomethingElse(
config.username,
config.password
)
...
}
}
And then change the original main to look like this...
object Main{
def main ( args: Array[String] ) :Unit = {
val export: Export = new Export();
export.doSomething();
...
};
}
But config is always null. What am I missing? How do I autowire using an executable Jar?

Answer 1

This is what worked for me...
// src/main/resources/application-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.1.xsd">
<context:component-scan base-package="my.package.where.export.is" />
</beans>
// Main
def main ( args: Array[String] ) :Unit = {
val ctx:ApplicationContext = new ClassPathXmlApplicationContext("application-context.xml");
val exporter = ctx.getBean(classOf[Export])
...
}
Now it is getting all the properties I would expect.