Objectify + Eclipse + Generate Cloud Endpoint Client Library

[Vanessa Gomes]

Hey, everyone. 

I am new here. I am sorry if this question was already solved. My problem is:

What I am using: Eclipse, Java, Objectify, App Engine

I was trying for about 3 weeks make my project work. At first, I had an Android Project. Then, with Google Eclipse Plugin, I generated an App Engine Backend (on Eclipse) and started to work with JPA. However, I had too many problems regarding relationships. I just lost time and patience. So, I decided to move to objectify.

I built my classes following all the steps of Objectify's documentation. I defined my Endpoints replacing the previous code (that used JPA) by a new one. objectify and guava jars are both on WEB-INF/lib and inside the buildpath. 

The problem: when I try to generate the Cloud Endpoint Client Libraries, I got this error:

There was a problem generating the API metadata for your Cloud Endpoints classes: com.google.appengine.repackaged.com.google.api.client.http.HttpResponseException: 

400 Bad Request

{"error": {"message": "Bad Request", "code": 400, "errors": [{"message": "api exception", "debug_info": "Variable  does not conform to style guide"}]}}

Error log:

java.lang.reflect.InvocationTargetException

at com.google.gdt.eclipse.appengine.swarm.wizards.GenerateSwarmApiAction$1.run(GenerateSwarmApiAction.java:82)

at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

Caused by: com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmGenerationException: com.google.appengine.repackaged.com.google.api.client.http.HttpResponseException: 400 Bad Request

{"error": {"message": "Bad Request", "code": 400, "errors": [{"message": "api exception", "debug_info": "Variable  does not conform to style guide"}]}}

at com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmApiCreator.createClientLibFromApiConfig(SwarmApiCreator.java:144)

at com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmApiCreator.createSwarmApi(SwarmApiCreator.java:258)

at com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmServiceCreator.create(SwarmServiceCreator.java:444)

at com.google.gdt.eclipse.appengine.swarm.wizards.GenerateSwarmApiAction$1.run(GenerateSwarmApiAction.java:80)

... 1 more

Caused by: com.google.appengine.repackaged.com.google.api.client.http.HttpResponseException: 400 Bad Request

{"error": {"message": "Bad Request", "code": 400, "errors": [{"message": "api exception", "debug_info": "Variable  does not conform to style guide"}]}}

at com.google.appengine.repackaged.com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1054)

at com.google.api.server.spi.tools.CloudClientLibGenerator.postRequest(CloudClientLibGenerator.java:53)

at com.google.api.server.spi.tools.CloudClientLibGenerator.generateClientLib(CloudClientLibGenerator.java:44)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmApiCreator.createClientLibFromApiConfig(SwarmApiCreator.java:142)

... 4 more

Root exception:

com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmGenerationException: com.google.appengine.repackaged.com.google.api.client.http.HttpResponseException: 400 Bad Request

{"error": {"message": "Bad Request", "code": 400, "errors": [{"message": "api exception", "debug_info": "Variable  does not conform to style guide"}]}}

at com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmApiCreator.createClientLibFromApiConfig(SwarmApiCreator.java:144)

at com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmApiCreator.createSwarmApi(SwarmApiCreator.java:258)

at com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmServiceCreator.create(SwarmServiceCreator.java:444)

at com.google.gdt.eclipse.appengine.swarm.wizards.GenerateSwarmApiAction$1.run(GenerateSwarmApiAction.java:80)

at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

Caused by: com.google.appengine.repackaged.com.google.api.client.http.HttpResponseException: 400 Bad Request

{"error": {"message": "Bad Request", "code": 400, "errors": [{"message": "api exception", "debug_info": "Variable  does not conform to style guide"}]}}

at com.google.appengine.repackaged.com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1054)

at com.google.api.server.spi.tools.CloudClientLibGenerator.postRequest(CloudClientLibGenerator.java:53)

at com.google.api.server.spi.tools.CloudClientLibGenerator.generateClientLib(CloudClientLibGenerator.java:44)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at com.google.gdt.eclipse.appengine.swarm.wizards.helpers.SwarmApiCreator.createClientLibFromApiConfig(SwarmApiCreator.java:142)

... 4 more

Some examples (including the Entity Registration). I will suppress package, imports and getters/setters. If anyone knows how to help, I would really appreciate. If there is any code I should put here, please let me know.

User.java

@Entity

    public class User {

@Id

private Long id;

private String name;

@Index

private PhoneNumber phoneNumber;

private String friendCode;

@Load

private List<Ref<Group>> groups = new ArrayList<Ref<Group>>(); //groups that a User can be simple member

//...

}

Group.java

@Entity

public class Group {

@Id

private Long id;

@Index(IfNotNull.class)

private String name;

@Load

@Index

private Ref<User> owner; // Owner of the group. The creator.

OfyService.java

import com.googlecode.objectify.Objectify;

import com.googlecode.objectify.ObjectifyFactory;

import com.googlecode.objectify.ObjectifyService;

public class OfyService {

    static {

        factory().register(Category.class);

        factory().register(Group.class);

        factory().register(Image.class);

        factory().register(Judgement.class);

        factory().register(User.class);

        

    }

    public static Objectify ofy() {

        return ObjectifyService.ofy();

    }

    public static ObjectifyFactory factory() {

        return ObjectifyService.factory();

    }

}

UserEndpoint.java

import static com.uandq.lychee.OfyService.ofy;

@Api(name = "sampleEndpoint", namespace = @ApiNamespace(ownerDomain = "sample.com", ownerName = "sample.com", packagePath = ""))

public class UserEndpoint {

@ApiMethod(name = "listUser")

public List<User> listUser() {

List<User> result = new ArrayList<User>();

result = ofy().load().type(User.class).list();

return result;

}

@ApiMethod(name = "getUser")

public User getUser(@Named Long id) {

User user = ofy().load().type(User.class).id(id).now();

return user;

}

@ApiMethod(name = "insertUser")

public User insertUser(User user) {

ofy().save().entity(user).now();

return user;

}

@ApiMethod(name = "removeUser")

public void removeUser(@Named Long id) {

ofy().delete().type(User.class).id(id).now();

}

@ApiMethod(name = "findUserByPhoneNumber")

public User findUserByPhoneNumber(PhoneNumber phone) {

User user = ofy().load().type(User.class)

.filter("phoneNumber ==", phone).first().now();

return user;

}

}

GroupEndpoint.java

import static com.uandq.lychee.OfyService.ofy;

@Api(name = "sampleEndpoint", namespace = @ApiNamespace(ownerDomain = "sample.com", ownerName = "sample.com", packagePath = ""))

public class GroupEndpoint {

@ApiMethod(name = "listGroup")

public List<Group> listGroup() {

List<Group> result = new ArrayList<Group>();

result = ofy().load().type(Group.class).list();

return result;

}

@ApiMethod(name = "getGroup")

public Group getGroup(@Named Long id) {

Group group = ofy().load().type(Group.class).id(id).now();

return group;

}

@ApiMethod(name = "insertGroup")

public Group insertGroup(Group group) {

ofy().save().entity(group).now();

return group;

}

@ApiMethod(name = "removeGroup")

public void removeGroup(@Named Long id) {

ofy().delete().type(Group.class).id(id).now();

}

}

web.xml

<?xml version="1.0" encoding="utf-8" standalone="no"?><web-app version="2.5">

<servlet>

<servlet-name>SystemServiceServlet</servlet-name>

<servlet-class>com.google.api.server.spi.SystemServiceServlet

</servlet-class>

<init-param>

<param-name>services</param-name>

<param-value>com.sample.GroupEndpoint, com.sample.UserEndpoint</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>SystemServiceServlet</servlet-name>

<url-pattern>/_ah/spi/*</url-pattern>

</servlet-mapping>

<filter>

<filter-name>ObjectifyFilter</filter-name>

<filter-class>com.googlecode.objectify.ObjectifyFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>ObjectifyFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

[Vanessa Gomes]

Also, I tried now to generate the Endpoint libs following these steps: 

1. Generating a client library for Android using endpoints.sh

via Terminal. And it did not work as well. I still get:

Error: 400 Bad Request

{"error": {"message": "Bad Request", "code": 400, "errors": [{"message": "api exception", "debug_info": "Variable  does not conform to style guide"}]}}

Any help is welcome.

[Jon Stevens]

I did a quick search in google for: Variable does not conform to style guide

I found this page which seems to have a lot of helpful information: 

https://cloud.google.com/developers/articles/google-cloud-endpoints-for-android

I searched for the word 'conform', which had this bit of text...

• Most parameter types must be serializable because JSON requires that the objects be serializable.
• You may also use any JavaBean, which includes anything from your model, since your model objects should conform to the JavaBean standard as described above.

I wonder if adding 'implements Serializable' to your objects would help?

It also sounds like you need zero arg constructors.

best,

jon

--
You received this message because you are subscribed to the Google Groups "objectify-appengine" group.
To unsubscribe from this group and stop receiving emails from it, send an email to objectify-appen...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Vanessa Gomes]

Hey, Jon. 

Thanks for the reply. Zero Arg Constructors are automatic (default) in Java, so there is no need to implement then. And also, Objectify mentions that on their documentation: 

• There must be a no-arg constructor (or no constructors - Java creates a default no-arg constructor). The no-arg constructor can have any protection level (private, public, etc).

https://code.google.com/p/objectify-appengine/wiki/Entities

Also, I found the problem. Actually I followed everything on this link you sent to me. Then, there is:

• Most parameter types must be serializable because JSON requires that the objects be serializable.
  • You may also use any JavaBean, which includes anything from your model, since your model objects should conform to the JavaBean standard as described above.

• A limited set of types need not be serializable, but must be annotated with @Named. These are the types: String, int/Integer, boolean/Boolean, long/Long.

In my endpoints, some parameters were using the annotation @Named in a wrong way: without the actual name of the parameter. I don't even need to implement Serializable. I just replaced:

public User getUser(@Named Long id)

by

public User getUser(@Named("id") Long id)

And all the others @Named parameters. Now I am able to generate the Endpoint libs.

Thank you very much.

Vanessa Gomes de Lima                    

Associate Student - 2013/2014 - BSc Computer Science

Queen Mary University of London

--
You received this message because you are subscribed to a topic in the Google Groups "objectify-appengine" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/objectify-appengine/981f4LlXscg/unsubscribe.
To unsubscribe from this group and all its topics, send an email to objectify-appen...@googlegroups.com.