Spring property placeholders in application-context.xml inside dependency jar - spring

Question

For my spring boot application I use annotation based configuration and a WebApplicationInitalizer.
One of my dependencies provides a spring configuration in an xml, included in the jar. I use #ImportResource to load the context xml. This seems to work, except for the fact that inside this xml, there are property placeholders, for example ${poolsize:10}
Apparently, spring does not automatically replace these placeholders (I get a NumberFormatException). Is there some extra configuration I need to add?
Our startup class:
public class Application implements WebApplicationInitializer {
#Override
public void onStartup(ServletContext container) throws ServletException {
// Create the 'root' Spring application context
AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
// config
rootContext.register(JmsConfiguration.class);
// Manage the lifecycle of the root application context
container.addListener(new ContextLoaderListener(rootContext));
}
}
And the configuration class (we use spring-jms):
#Configuration
#EnableJms
#ComponentScan(basePackages = { "..." })
public class JmsConfiguration implements JmsListenerConfigurer {
// config for jms listener and jaxb, nothing to do with property handling
}
Perhaps I'm mistaken in thinking that using a WebapplicationInitializer is how to use spring boot. Perhaps we don't even need spring boot? The only spring boot related dependency we use is:
<dependency>
<!-- Import dependency management from Spring Boot -->
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>1.5.3.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
Spring dependencies we use:
org.springframework:spring-context:jar:4.3.8.RELEASE:compile
org.springframework:spring-jms:jar:4.3.8.RELEASE:compile
org.springframework:spring-oxm:jar:4.3.8.RELEASE:compile
org.springframework:spring-context:jar:4.3.8.RELEASE:compile
org.springframework:spring-beans:jar:4.3.8.RELEASE:compile

Answer 1

I figured it out thanks #M. Deinum
We don't need spring boot to use the WebApplicationInitializer, but (at least without spring boot) we have to declare our own PropertySourcesPlaceholderConfigurer:
#Configuration
#ImportResource(locations = {"classpath*:/library-context.xml"})
public class MyConfiguration {
#Bean
public static PropertySourcesPlaceholderConfigurer propertyPlaceholderConfigurer() {
return new PropertySourcesPlaceholderConfigurer();
}
}
NB. This works out of the box in spring boot thanks to #EnableAutoConfiguration and #PropertyPlaceholderAutoConfiguration which contains the exact same PropertySourcesPlaceholderConfigurer bean