Issues with setting up AppEngine Endpoint class from Objectify in Eclipse - google-app-engine

Question

I am very new to Objectify and I am trying to create endpoints for a simple object. The issue that I am running into is that the endpoint class that Eclipse auto creates has references to JPA. Do I have to manually create my own endpoint class instead of using the "Generate Endpoint Class" in Eclipse? Here are the steps I took to set up my project and the source code:
Created a Web Application Project in Eclipse (app engine project)
Added Objectify-5.0.3.jar and guava-17.0.jar files to web-inf/lib and project's class path
Created a simple class Car.java and added annotations
Registered the entity in servlet (ObjectifyService.register(Car.class);
Right clicked on the Car class and selected Google App Engine (WPT) > Generate Cloud End Point Class
Deployed to App Engine and from API Explorer tried to insert a record and I got this error in logs:
https://objectify-example-650.appspot.com/_ah/api/carendpoint/v1/car
Method: carendpoint.insertCar
Error Code: 400
Reason: badRequest
Message: java.lang.IllegalArgumentException: Type ("com.appengine.objectify.Car") is not that of an entity but needs to be for this operation
I also see this error/warning in app engine project log:
<pre>
org.datanucleus.metadata.MetaDataManager loadPersistenceUnit: Class com.appengine.objectify.CarEndpoint was specified in persistence-unit transactions-optional but not annotated, so ignoring
</pre>
Here is my source code:
import com.googlecode.objectify.annotation.Entity;
#Entity
public class Car {
#Id Long id;
String vin;
String color;
private Car() {}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getVin() {
return vin;
}
public void setVin(String vin) {
this.vin = vin;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
}
The endpoint class:
#Api(name = "carendpoint", namespace = #ApiNamespace(ownerDomain = "appengine.com", ownerName = "appengine.com", packagePath = "objectify"))
public class CarEndpoint {
#SuppressWarnings({ "unchecked", "unused" })
#ApiMethod(name = "listCar")
public CollectionResponse<Car> listCar(
#Nullable #Named("cursor") String cursorString,
#Nullable #Named("limit") Integer limit) {
EntityManager mgr = null;
Cursor cursor = null;
List<Car> execute = null;
try {
mgr = getEntityManager();
Query query = mgr.createQuery("select from Car as Car");
if (cursorString != null && cursorString != "") {
cursor = Cursor.fromWebSafeString(cursorString);
query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
}
if (limit != null) {
query.setFirstResult(0);
query.setMaxResults(limit);
}
execute = (List<Car>) query.getResultList();
cursor = JPACursorHelper.getCursor(execute);
if (cursor != null)
cursorString = cursor.toWebSafeString();
for (Car obj : execute)
;
} finally {
mgr.close();
}
return CollectionResponse.<Car> builder().setItems(execute)
.setNextPageToken(cursorString).build();
}
#ApiMethod(name = "getCar")
public Car getCar(#Named("id") Long id) {
EntityManager mgr = getEntityManager();
Car car = null;
try {
car = mgr.find(Car.class, id);
} finally {
mgr.close();
}
return car;
}
#ApiMethod(name = "insertCar")
public Car insertCar(Car car) {
EntityManager mgr = getEntityManager();
try {
if (containsCar(car)) {
throw new EntityExistsException("Object already exists");
}
mgr.persist(car);
} finally {
mgr.close();
}
return car;
}
#ApiMethod(name = "updateCar")
public Car updateCar(Car car) {
EntityManager mgr = getEntityManager();
try {
if (!containsCar(car)) {
throw new EntityNotFoundException("Object does not exist");
}
mgr.persist(car);
} finally {
mgr.close();
}
return car;
}
#ApiMethod(name = "removeCar")
public void removeCar(#Named("id") Long id) {
EntityManager mgr = getEntityManager();
try {
Car car = mgr.find(Car.class, id);
mgr.remove(car);
} finally {
mgr.close();
}
}
private boolean containsCar(Car car) {
EntityManager mgr = getEntityManager();
boolean contains = true;
try {
Car item = mgr.find(Car.class, car.getId());
if (item == null) {
contains = false;
}
} finally {
mgr.close();
}
return contains;
}
private static EntityManager getEntityManager() {
return EMF.get().createEntityManager();
}
}
EFM class created by eclipse when autogenerating the endpoint class:
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
public final class EMF {
private static final EntityManagerFactory emfInstance = Persistence
.createEntityManagerFactory("transactions-optional");
private EMF() {
}
public static EntityManagerFactory get() {
return emfInstance;
}
}

Answer 1

The auto-gen cloud endpoint classes, are for JPA/ JDO only, its covered here: Objectify with Endpoints for android Hope that helps

Answer 2

Thanks Tim! I ended up writing the endpoint class. As you mentioned eclipse does not create endpoint class for classes annotated for Objectity.
package com.appengine.objectify;
import static com.appengine.objectify.OfyService.ofy;
import com.google.api.server.spi.config.Api;
import com.google.api.server.spi.config.ApiMethod;
import com.google.api.server.spi.config.ApiNamespace;
import java.util.ArrayList;
import java.util.List;
import javax.inject.Named;
#Api(name = "carendpoint", namespace = #ApiNamespace(ownerDomain = "appengine.com", ownerName = "appengine.com", packagePath = "objectify"))
public class CarEndpoint {
#ApiMethod(name = "listCar")
public List<Car> listCar() {
List<Car> result = new ArrayList<Car>();
result = ofy().load().type(Car.class).list();
return result;
}
#ApiMethod(name = "getCar")
public Car getCar(#Named Long id) {
Car Car = ofy().load().type(Car.class).id(id).now();
return Car;
}
#ApiMethod(name = "insertCar")
public Car insertCar(Car Car) {
ofy().save().entity(Car).now();
return Car;
}
#ApiMethod(name = "removeCar")
public void removeCar(#Named Long id) {
ofy().delete().type(Car.class).id(id).now();
}
}