Look at http://stackoverflow.com/questions/40148220/failed-to-get-request-token-on-tumblr-301-error/40159239#40159239

TumblrExample.java

/** Example from https://github.com/scribejava/scribejava/blob/master/scribejava-apis/src/test/java/com/github/scribejava/apis/examples/TumblrExample.java
*/
import java.util.Scanner;
import com.github.scribejava.core.builder.ServiceBuilder;
import com.github.scribejava.core.model.OAuth1AccessToken;
import com.github.scribejava.core.model.OAuth1RequestToken;
import com.github.scribejava.core.model.OAuthRequest;
import com.github.scribejava.core.model.Response;
import com.github.scribejava.core.model.Verb;
import com.github.scribejava.core.oauth.OAuth10aService;
import java.io.IOException;

public final class TumblrExample {

    private static final String PROTECTED_RESOURCE_URL = "https://api.tumblr.com/v2/user/info";

    private TumblrExample() {
    }

    public static void main(String... args) throws IOException {
        final OAuth10aService service = new ServiceBuilder()
                .apiKey("MY_CONSUMER_KEY")
                .apiSecret("MY_CONSUMER_SECRET")
                // OOB forbidden. We need an url and the better is on the tumblr website !
                .callback("https://www.tumblr.com/connect/login_success.html")
                .build(TumblrHTTPSApi.instance());
        final Scanner in = new Scanner(System.in);

        System.out.println("=== Tumblr's OAuth Workflow ===");
        System.out.println();

        // Obtain the Request Token
        System.out.println("Fetching the Request Token...");
        final OAuth1RequestToken requestToken = service.getRequestToken();
        System.out.println("Got the Request Token!");
        System.out.println();

        System.out.println("Now go and authorize ScribeJava here:");
        System.out.println(service.getAuthorizationUrl(requestToken));
        System.out.println("And paste the verifier here");
        System.out.print(">>");
        final String oauthVerifier = in.nextLine();
        System.out.println();

        // Trade the Request Token and Verfier for the Access Token
        System.out.println("Trading the Request Token for an Access Token...");
        final OAuth1AccessToken accessToken = service.getAccessToken(requestToken, oauthVerifier);
        System.out.println("Got the Access Token!");
        System.out.println("(if your curious it looks like this: " + accessToken
                + ", 'rawResponse'='" + accessToken.getRawResponse() + "')");
        System.out.println();

        // Now let's go and ask for a protected resource!
        System.out.println("Now we're going to access a protected resource...");
        final OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL, service);
        service.signRequest(accessToken, request);
        final Response response = request.send();
        System.out.println("Got it! Lets see what we found...");
        System.out.println();
        System.out.println(response.getBody());

        System.out.println();
        System.out.println("Thats it man! Go and build something awesome with Scribe! :)");
    }
}

TumblrHTTPSApi.java

import com.github.scribejava.core.builder.api.DefaultApi10a;
import com.github.scribejava.core.model.OAuth1RequestToken;


/**
 * look at https://github.com/scribejava/scribejava/wiki/Custom-Apis and https://www.tumblr.com/oauth/apps
 * Request-token URL:
 *	POST https://www.tumblr.com/oauth/request_token
 * Authorize URL:
 *	https://www.tumblr.com/oauth/authorize
 * Access-token URL:
 *	POST https://www.tumblr.com/oauth/access_token
 *
 * @author tim
 *
 */
public class TumblrHTTPSApi extends DefaultApi10a {
    private static final String AUTHORIZE_URL = "https://www.tumblr.com/oauth/authorize?token=%s";

    protected TumblrHTTPSApi() {
    }

    private static class InstanceHolder {
        private static final TumblrHTTPSApi INSTANCE = new TumblrHTTPSApi();
    }

    public static TumblrHTTPSApi instance() {
        return InstanceHolder.INSTANCE;
    }

    @Override
    public String getAccessTokenEndpoint(){
        return "https://www.tumblr.com/oauth/access_token";
    }

    @Override
    public String getRequestTokenEndpoint() {
      return "https://www.tumblr.com/oauth/request_token";
    }

    @Override
    public String getAuthorizationUrl(OAuth1RequestToken requestToken) {
      return String.format(AUTHORIZE_URL, requestToken.getToken());
    }
}