fix doc bug, added 204 test, fixed 204 issue with ananomous inner class

src/main/java/com/auth0/client/mgmt/JobsEntity.java

@@ -10,13 +10,16 @@
 import com.auth0.net.Request;
 import com.auth0.utils.Asserts;
 import com.fasterxml.jackson.core.type.TypeReference;
+import java.io.IOException;
+import java.util.Collections;
 import java.util.List;
 import okhttp3.HttpUrl;
 import okhttp3.OkHttpClient;
 
 import java.io.File;
 import java.util.HashMap;
 import java.util.Map;
+import okhttp3.ResponseBody;
 
 /**
  * Class that provides an implementation of the Jobs methods of the Management API as defined in https://auth0.com/docs/api/management/v2#!/Jobs
@@ -73,8 +76,17 @@ public Request<List<JobErrorDetails>> getErrorDetails(String jobId) {
             .build()
             .toString();
 
-        CustomRequest<List<JobErrorDetails>> request = new CustomRequest<>(client, url, "GET", new TypeReference<List<JobErrorDetails>>() {
-        });
+        TypeReference<List<JobErrorDetails>> jobErrorDetailsListType = new TypeReference<List<JobErrorDetails>>() {
+        };
+        CustomRequest<List<JobErrorDetails>> request = new CustomRequest<List<JobErrorDetails>>(client, url, "GET", jobErrorDetailsListType) {
+            @Override
+            protected List<JobErrorDetails> readResponseBody(ResponseBody body) throws IOException {
+                if (body.contentLength() == 0) {
+                    return Collections.emptyList();
+                }
+                return super.readResponseBody(body);
+            }
+        };
         request.addHeader("Authorization", "Bearer " + apiToken);
         return request;
     }

src/main/java/com/auth0/net/CustomRequest.java

@@ -55,6 +55,9 @@ protected RequestBody createRequestBody() throws IOException {
 
     @Override
     protected T readResponseBody(ResponseBody body) throws IOException {
+        if (body.contentLength() == 0) {
+            return null;
+        }
         String payload = body.string();
         return mapper.readValue(payload, tType);
     }

src/test/java/com/auth0/client/MockServer.java

@@ -154,6 +154,14 @@ public void jsonResponse(String path, int statusCode) throws IOException {
         server.enqueue(response);
     }
 
+    public void noContentResponse() {
+        MockResponse response = new MockResponse()
+            .setResponseCode(204)
+            .addHeader("Content-Type", "application/json")
+            .setBody("");
+        server.enqueue(response);
+    }
+
     public void rateLimitReachedResponse(long limit, long remaining, long reset) {
         MockResponse response = new MockResponse().setResponseCode(429);
         if (limit != -1) {

src/test/java/com/auth0/client/mgmt/JobsEntityTest.java

@@ -81,6 +81,23 @@ public void shouldGetJobErrorDetails() throws Exception {
         assertThat(response.get(0).getErrors(), hasSize(1));
     }
 
+    @Test
+    public void shouldGetJobErrorDetails_noErrors() throws Exception {
+        Request<List<JobErrorDetails>> request = api.jobs().getErrorDetails("1");
+        assertThat(request, is(notNullValue()));
+
+        server.noContentResponse();
+        List<JobErrorDetails> response = request.execute();
+        RecordedRequest recordedRequest = server.takeRequest();
+
+        assertThat(recordedRequest, hasMethodAndPath("GET", "/api/v2/jobs/1/errors"));
+        assertThat(recordedRequest, hasHeader("Content-Type", "application/json"));
+        assertThat(recordedRequest, hasHeader("Authorization", "Bearer apiToken"));
+
+        assertThat(response, is(notNullValue()));
+        assertThat(response, is(empty()));
+    }
+
     @Test
     public void shouldThrowOnRequestUsersExportWithNullConnectionId() {
         exception.expect(IllegalArgumentException.class);