[google-cloud-sql-discuss] Spring JPA applicationContext.xml for Google Cloud SQL Postgres

I want to connect to Google Cloud SQL Postgres using my Spring 4 application running on GKE using JPA. Previously, my applicationContext.xml which connected to database on a container in the same pod as application, contained:

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
 <property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>


<bean id="entityManagerFactory"
 class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
 <property name="dataSource" ref="dataSource" />
 <property name="packagesToScan" value="com.avaya.myproject.entity" />
 <property name="jpaVendorAdapter" ref="hbAdapterBean_pgsql"/>
 <property name="jpaProperties">
 <props>
 <prop key="hibernate.show_sql">false</prop>
 <prop key="hibernate.format_sql">true</prop>
 <prop key="hibernate.hbm2ddl.auto">update</prop>
 <prop key="hibernate.id.new_generator_mappings">true</prop>
 </props>
 </property>
</bean>


<bean id="hbAdapterBean_pgsql" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">  
 <property name="showSql" value="false"></property>  
 <property name="generateDdl" value="true"></property>  
 <property name="databasePlatform" value="org.hibernate.dialect.PostgreSQLDialect"></property>  
</bean>  


<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">  
 <property name="driverClassName" value="org.postgresql.Driver"></property>  
 <property name="url" value="jdbc:postgresql://${DB_HOST_}:${DB_PORT_}/${DB_NAME_}"></property>  
 <property name="username" value="${DB_USER_}"></property>  
 <property name="password" value="${DB_PASSWORD_}"></property>  
</bean>
 
<bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
 <constructor-arg ref="dataSource"/>
</bean>

I'm struggling to figure out what changes are required in the xml for connecting with Google Cloud SQL Postgres.

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