What's wrong with Google endpoints -- Cloud SQL connection? - mysql

Question

I'm trying to connect from a Google Endpoints server to a Google Cloud SQL server. I'm modifying the Greetings.getGreeting() method in this tutorial:
https://cloud.google.com/appengine/docs/java/endpoints/getstarted/backend/helloendpoints
to call the Cloud mysql database as demonstrated in this tutorial (see doGet method):
https://cloud.google.com/appengine/docs/java/cloud-sql/#enable_connector_j
I have made sure that I can connect to the database from my machine mysql client. The database instance "simple" has a single table "simpletable" who's rows hold an entityID and a string. (But I'm not able to connect, so that's not too important yet.)
This is my endpoints code:
package com.example.helloendpoints;
import com.google.api.server.spi.config.Api;
import com.google.api.server.spi.config.ApiMethod;
import com.google.api.server.spi.response.NotFoundException;
import com.google.appengine.api.users.User;
import java.sql.*;
import java.util.ArrayList;
import javax.inject.Named;
/**
* Defines v1 of a helloworld API, which provides simple "greeting" methods.
*/
#Api(
name = "helloworld",
version = "v1",
scopes = {Constants.EMAIL_SCOPE},
clientIds = {Constants.WEB_CLIENT_ID,
Constants.ANDROID_CLIENT_ID,
Constants.IOS_CLIENT_ID,
Constants.API_EXPLORER_CLIENT_ID},
audiences = {Constants.ANDROID_AUDIENCE}
)
public class Greetings {
public static ArrayList<HelloGreeting> greetings = new ArrayList<HelloGreeting>();
static {
greetings.add(new HelloGreeting("hello world!"));
greetings.add(new HelloGreeting("goodbye world!"));
}
public HelloGreeting getGreeting(#Named("id") Integer id) throws NotFoundException {
// pair to use when running local endpoint server
String urlFromDev = "jdbc:mysql://173.194.XXX.90:3306/simple?user=root";
String classForNameFromDev = "com.mysql.jdbc.Driver";
// pair to use when running cloud endpoint server
String classForNameFromCloud = "com.mysql.jdbc.GoogleDriver";
String urlFromCloud = "jdbc:google:mysql://"
+ Constants.PROJECT_ID + ":"
+ Constants.CLOUD_SQL_INSTANCE_NAME +"/"
+ Constants.DATABASE_NAME + "?user=root";
HelloGreeting helloGreeting = new HelloGreeting();
try {
Class.forName(classForNameFromDev);
// Class.forName(classForNameFromCloud);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
Connection connection = DriverManager.getConnection(urlFromDev);
// Connection connection = DriverManager.getConnection(urlFromCloud);
try {
String statement = "Select simplestring from simpletable where entryID = ?";
PreparedStatement preparedStatement = connection.prepareStatement(statement);
preparedStatement.setInt(1, id);
ResultSet resultSet = preparedStatement.executeQuery();
if (!resultSet.wasNull()) {
helloGreeting.setMessage(resultSet.getString("simplestring"));
} else {
throw new NotFoundException("Greeting not found with an index: " + id);
}
} finally {
connection.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
return helloGreeting;
}
#ApiMethod(name = "greetings.multiply", httpMethod = "post")
public HelloGreeting insertGreeting(#Named("times") Integer times, HelloGreeting greeting) {
HelloGreeting response = new HelloGreeting();
StringBuilder responseBuilder = new StringBuilder();
for (int i = 0; i < times; i++) {
responseBuilder.append(greeting.getMessage());
}
response.setMessage(responseBuilder.toString());
return response;
}
#ApiMethod(name = "greetings.authed", path = "hellogreeting/authed")
public HelloGreeting authedGreeting(User user) {
HelloGreeting response = new HelloGreeting("hello " + user.getEmail());
return response;
}
}
I have tried to enable mysql connector/j in my appengine-web.xml
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<use-google-connector-j>true</use-google-connector-j>
<application>backendapitutorial-1XXX</application>
<version>${app.version}</version>
<threadsafe>true</threadsafe>
<system-properties>
<property name="java.util.logging.config.file" value="WEB- INF/logging.properties"/>
</system-properties>
</appengine-web-app>
Whichever way I build+depl0y it (Dev or cloud), I always get
java.sql.SQLException: No suitable driver found for jdbc:mysql://173.194.XXX.90:3306/simple?user=root
or
java.sql.SQLException: No suitable driver found for jdbc:google:mysql://backendapitutorial-XXXX:simple/simple?user=root
(I replaced the real IP and project name with "X"s for this post).
I've already looked at these:
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/dbname
ClassNotFoundException: com.mysql.jdbc.GoogleDriver
What does 'Class.forName("org.sqlite.JDBC");' do?
I'm building with Maven and working on IntelliJ IDE.
Any help is greatly appreciated. Thanks.