Jersey REST The ResourceConfig instance does not contain any root resource classes [duplicate]

Answer 1

you might need to use a url like this

http://localhost:8080/<web_context_root>/nd/hello

Answer 2

To resolve this problem, please verify your class MapperIn, there is required to specify Path:

import javax.ws.rs.GET;
import javax.ws.rs.OPTIONS;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import com.lot.account.api.doc.GetMemberAccountsIn;
import com.lot.common.doc.CommonApi;
import com.lot.common.doc.FlowData;
import com.lot.security.authorization.RequestData;


@Path("/account/member/")
public class MapperIn {

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    @Path("/{memberId}")
    public GetAccountIn prepareGetAccount(@PathParam("memberId") String memberId) {

        // create apiInput
        GetAccountIn apiInput = new GetAccountIn ();

        // map values from url
            apiInput.setMemberId(memberId);


        return apiInput;
    }
//...
}

Answer 3

I found that the "no provider classes found" message is scary but not important.

"The ResourceConfig instance does not contain any root resource classes" is a much bigger problem.

I found that the resource class needs to be annotated with @Path, and the provider class (if you have one -- we use one for mapping exceptions to HTTP response codes) needs to be annotated with @Provider, and both need to be in the right package, and then Jersey will find them.