[google-appengine] Org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

[BestBuy Holidays]

I am getting this error when I try to connect to google cloud sql from JPA 
+ Hibernate. The configuration is

<?xml version="1.0" encoding="UTF-8"?>

<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 

xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd";>

<persistence-unit name="ContactUsPU">

<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>

<properties>

<property name="hibernate.dialect" value=
"org.hibernate.dialect.MySQL57InnoDBDialect" /> 

<property name="hibernate.hbm2ddl.auto" value="none" />

<property name="hibernate.connection.driver_class" value=
"com.mysql.jdbc.Driver" />

<!-- <property name="hibernate.connection.url" 
value="jdbc:mysql://localhost/bbholidays" />  -->

<property name="hibernate.connection.url" 

value=
"jdbc:mysql://google/bbh_database?cloudSqlInstance=bbhwebapp:asia-southeast1:bbh-db&amp;socketFactory=com.google.cloud.sql.mysql.SocketFactory&amp;useSSL=false"
/>

<property name="hibernate.connection.username" value="xxxxx" />

<property name="hibernate.connection.password" value="xxxxx" />

<property name="hibernate.archive.autodetection" value="class" />

<property name="hibernate.show_sql" value="true" />

<property name="hibernate.format_sql" value="true" />

<property name="hibernate.use_sql_comments" value="true" />

<property name="hbm2ddl.auto" value="none" />

<property name="hibernate.connection.autocommit" value="true"/>

</properties>

</persistence-unit>

</persistence>

Org.hibernate.service.spi.ServiceException: Unable to create requested 
service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

   1. 
      1. at org.hibernate.service.internal.
      AbstractServiceRegistryImpl.createService (
      AbstractServiceRegistryImpl.java:271)
      2. at org.hibernate.service.internal.
      AbstractServiceRegistryImpl.initializeService (
      AbstractServiceRegistryImpl.java:233)
      3. at org.hibernate.service.internal.
      AbstractServiceRegistryImpl.getService (
      AbstractServiceRegistryImpl.java:210)
      4. at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure (
      JdbcServicesImpl.java:51)
      5. at org.hibernate.boot.registry.internal.
      StandardServiceRegistryImpl.configureService (
      StandardServiceRegistryImpl.java:94)
      6. at org.hibernate.service.internal.
      AbstractServiceRegistryImpl.initializeService (
      AbstractServiceRegistryImpl.java:242)
      7. at org.hibernate.service.internal.
      AbstractServiceRegistryImpl.getService (
      AbstractServiceRegistryImpl.java:210)
      8. at org.hibernate.boot.model.process.spi.
      MetadataBuildingProcess.handleTypes (MetadataBuildingProcess.java:352)
      9. at org.hibernate.boot.model.process.spi.
      MetadataBuildingProcess.complete (MetadataBuildingProcess.java:111)
      10. at org.hibernate.jpa.boot.internal.
      EntityManagerFactoryBuilderImpl.metadata (
      EntityManagerFactoryBuilderImpl.java:861)
      11. at org.hibernate.jpa.boot.internal.
      EntityManagerFactoryBuilderImpl.build (
      EntityManagerFactoryBuilderImpl.java:888)
      12. at org.hibernate.jpa.
      HibernatePersistenceProvider.createEntityManagerFactory (
      HibernatePersistenceProvider.java:58)
      13. at javax.persistence.Persistence.createEntityManagerFactory (
      Persistence.java:55)
      14. at javax.persistence.Persistence.createEntityManagerFactory (
      Persistence.java:39)
   

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