Reading a "properties" file - spring

Question

I have a Rest service using Resteasy (running on top of Appengine), with the following psuedo code:
#Path("/service")
public class MyService {
#GET
#Path("/start")
public Response startService() {
// Need to read properties file here.
// like: servletContext.getResourceAsStream("/WEB-INF/config.properties")
}
}
However its obvious that the servlet context cannot be accessed here.
And code like:
InputStream inputStream = this.getClass().getClassLoader()
.getResourceAsStream("/WEB-INF/config.properties");
Can't be executed within the Appengine environment.
EDIT:
I have tried doing it with Spring like:
appContext.xml
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations" value="/WEB-INF/auth.properties"/>
</bean>
Then, put this on the actual class fields:
#Path("/service")
public MyService{
#Autowired
#Value("${myservice.userid}")
private String username;
#Autowired
#Value("${myservice.passwd}")
private String password;
// Code omitted
}
However, part of the code of the MyService complains because the username and password was not "injected", I mean its empty although its on the auth.properties file

Answer 1

In RESTEasy you can easily inject Servlet context via #Context annotation: http://docs.jboss.org/resteasy/docs/2.3.1.GA/userguide/html_single/index.html#_Context
Examples can be found here: Rest easy and init params - how to access?

Answer 2

This should work if you put the file in /WEB-INF/classes/ (which, importantly, is on the classpath), specifying config.properties as a file at the top-level.
this.getClass().getClassLoader().getResourceAsStream("/config.properties");
See this similar question: How to load properties file in Google App Engine?
Edit: Now you've edited, I'll respond & answer the Spring-related question. So, put the auth.properties into /WEB-INF/classes/ , and then specify classpath as follows.
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:auth.properties"/>
</bean>