Failed to generate endpoints api with maven using Multiclass API - Java Inheritance - google-app-engine

Question

I based my endpoint classes from this example
#Api(name = "tictactoe", version = "v1")
class TicTacToeBase { … }
// TicTacToeA and TicTacToeB both behave as if they have the same #Api annotation as
// TicTacToeBase
class TicTacToeA extends TicTacToeBase { … }
class TicTacToeB extends TicTacToeBase { … }
Endpoints works perfectly with android studio's gradle.
but when I move the source files to my maven-structured project it doesn't recognized TicTacToeA & TicTacToeB as endpoints classes. I've tried to use just simple annotated Endpoint class and it works.
web.xml contents from gradle-structured project is also copied to maven-structured project.
I noticed from target folder of maven-structured project that web.xml was generated but this time only with
<param-value>com.sample.TicTacToeBase</param-value>
shouldn't it be
<param-value>com.sample.TicTacToeA,com.sample.TicTacToeB</param-value>?

Answer 1

You are right! Each API needs to be declared in the web.xml file. Normally you can do this in the file src/main/webapp/WEB-INF/web.xml. (the web.xml file in the target folder is just a copy)
For example, you have a class TicTacToeAPI with annotations which define your API and two subclasses which extend this one.
TicTacToeAPI
#Api(name = "tictactoe",
canonicalName = "TicTacToe API",
version = "v1",
title = "TicTacToe Client API",
description = "TicTacToe Client API.",
namespace = #ApiNamespace(
ownerName = "tictactoe.com",
ownerDomain = "tictactoe.com")
)
public class TicTacToeAPI {
// ...
}
TicTacToeA & TicTacToeB
public class TicTacToeA extends TicTacToeAPI {
// Exposes some methods using annotations.
}
public class TicTacToeB extends TicTacToeAPI {
// Exposes some methods using annotations.
}
In your web.xml file, you cannot declare only the top level class. All subclasses have to be defined.
web.xml
<web-app>
...
<!--Google Cloud Endpoint-->
<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.TicTacToeA,
com.sample.TicTacToeB
</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>SystemServiceServlet</servlet-name>
<url-pattern>/_ah/spi/*</url-pattern>
</servlet-mapping>
...
</web-app>