I'm building a small Java EE 8 application that should run on OpenLiberty.
It has a JAX-RS ContainerResponseFilter that looks like this:
package my.package;
import javax.inject.Inject;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.ext.Provider;
@Provider
public class MyFilter implements ContainerResponseFilter {
private final MyService myService;
@Inject
public DiagnosticsFilter(final MyService myService) {
this.myService = myService;
}
@Override
public void filter(final ContainerRequestContext request, final ContainerResponseContext response) {
// Never mind this
}
}
If I write the filter like this and start my app, the myService argument to the constructor is null.
However, if field is annoted with @Inject and the constructor is omitted, the field is being injected correctly.
The MyService class is annotated with @Stateless, and in beans.xml I have set bean-discovery-mode="all".
Any idea what I'm doing wrong? Is this actually supposed to work? The Weld documentation suggests that it should, but I'm not sure it's in the CDI spec as well...
jaxrscontainer is responsible for actually creating the filter, before delegating tocdito perform CDI specific injection. That is why field injection works, but constructor injection does not. - maress