How to enable MultiPartFeature?

Question

My JAX-RS application has an extended Application class.

@ApplicationPath("/") public class MyApplication extends Application { // empty; really empty } 

How to enable org.glassfish.jersey.media.multipart.MultiPartFeature without changing the class? Or without the need to register all resource classes / packages?

Answer 1

Not sure why you are not just using ResourceConfig instead of the Application class. The only reason I can think of is portability, but using a specific multi-part Jersey function already violates this mobility.

But in any case, I will try to answer this in the "most portable" way. What you can do is set the property as in web.xml. To set custom properties, you can override

 @Override public Map<String, Object> getProperties() {} 

in the Application subclass and set the properties there.

 @Override public Map<String, Object> getProperties() { Map<String, Object> props = new HashMap<>(); props.put("jersey.config.server.provider.classnames", "org.glassfish.jersey.media.multipart.MultiPartFeature"); return props; } 

This will support class scans for your resources and providers. Scanning is disabled only if you override getClasses() or getSingletons() (and return non-empty sets), but getProperties() is fine.

Another variant:

Create Feature to wrap this function, and let the function be detected, as here.

Personally, I would ...

Just use ResourceConfig as you are already violating portability (which is a bit more of a breakdown :-)

 @ApplicationPath("/") public class AppConfig extends ResourceConfig { public AppConfig() { packages("packages.to.scan"); register(MultiPartFeature.class); } } 

Answer 2

For me, I worked as follows:

  final ResourceConfig resourceConfig = new ResourceConfig(ApplicationConfig.class); resourceConfig.packages("com.econorma.rest"); resourceConfig.register(MultiPartFeature.class); ServletHolder jerseyServlet = new ServletHolder(new ServletContainer(resourceConfig)); 

This is the ApplicationConfig class

 @ApplicationPath("/") public class ApplicationConfig extends Application { @Override public Set<Class<?>> getClasses() { final Set<Class<?>> resources = new HashSet<Class<?>>(); resources.add(MultiPartFeature.class); resources.add(EntryPoint.class); return resources; } @Override public Map<String, Object> getProperties() { Map<String, Object> properties = new HashMap<String, Object>(); properties.put("jersey.config.server.provider.packages", "com.econorma.rest"); return properties; } }