Ability to add a custom ResourceLoader conveniently in AnnotationConfigWebApplicationContext or conveniently as can be done via spring boot [SPR-13905]

[spring-projects-issues]

Gaurav Rawat opened SPR-13905 and commented

USE CASE
Hi I want to use @PropertySource in spring for a custom resource ie say xyz://path/x.txt instead of standard protocols like classpath file and so on which it already supports .I have found a way to do the same in spring Boot that is by SpringApplication as below with a custom ResourceLoader

protected WebApplicationContext run(SpringApplication app){
 app.setResourceLoader(new MyCustomResourceLoader);
 return (WebApplicationContext )app.run();
}

The same works well and now I can define propertySource like @PropertySource("xyz://path/y.txt") .But I was not able to figure out how to override/customize the same in a normal spring application .

Stuff I will do in my custom ResourceLoader

public Class CustomResourceLoader extends DefaultResourceLoader{

@Override
public Resource getResource(String location){
if(location.startsWith("xyz://"){
return new XYZResource(new URI(location));
}
return super.getResource(location);
}

Now I just need a way to tell spring to use this instead of the defaultresourceloader it's possible as I mentioned in SPring boot but need to figure out how to do it in pure Spring.

UPDATE
With the help of Chris Beams was able to figure out a way to do the same in CML apps via AnnotationConfigApplicationContext but still its not possible to do it conveninently for web apps unless you override AnnotationConfigWebApplicationContext getResourceXX methods and use your custom resource loader there (doesnt sound elegant) Hence I think we should either introduce ability to override resource loader via AnnotationConfigWebApplicationContext or come with something more elegant like we can do with Spring BOOT .

---

Affects: 4.1.7

Reference URL: http://stackoverflow.com/questions/35066913/using-custom-resource-protocol-in-propertysource-in-spring-using-custom-resourc

Issue Links:

• Add support to enhance default resource loader [SPR-12857] #17455 Add support to enhance default resource loader

Referenced from: commits 37de0b2, 0dff782

[spring-projects-issues]

Juergen Hoeller commented

Along the lines of #17455, you should be able to implement a custom ResourceResolver for your protocol now and register it with any ApplicationContext variant. This is hopefully close to your intention, since you don't seem to want to override the entire loader; you are just trying to handle a custom protocol in addition to the loader's standard resolution rules.

Juergen