感谢您光临我的问题。
我有一个使用云SQL在Google云上运行的java（Spring + maven + hibernate）应用程序。每当数据库和应用程序之间存在通信时，它就会抛出这个异常，说无法打开连接通信失败。在最后它给了我：
Caused by: java.net.SocketException: Permission denied: Attempt to access a blocked recipient without permission. (mapped-IPv4)
at com.google.appengine.api.socket.SocketApiHelper.translateError(SocketApiHelper.java:105)
at com.google.appengine.api.socket.SocketApiHelper.translateError(SocketApiHelper.java:116)
at com.google.appengine.api.socket.SocketApiHelper.makeSyncCall(SocketApiHelper.java:82)
at com.google.appengine.api.socket.AppEngineSocketImpl.createSocket(AppEngineSocketImpl.java:497)
at com.google.appengine.api.socket.AppEngineSocketImpl.connectToAddress(AppEngineSocketImpl.java:362)
at com.google.appengine.api.socket.AppEngineSocketImpl.connect(AppEngineSocketImpl.java:352)
at java.net.Socket.connect(Socket.java:600)
at java.net.Socket.connect(Socket.java:537)
at java.net.Socket.<init>(Socket.java:434)
at java.net.Socket.<init>(Socket.java:250)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)
... 113 more
org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Could not open connection
at org.springframework.orm.hibernate4.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:440)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:334)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at com.sun.proxy.$Proxy38.loadAdminLoginFromDetails(Unknown Source)
at com.bullbeardevice.service.impl.CustomAuthenticationManager.authenticate(CustomAuthenticationManager.java:47)
我的hibernate配置文件：
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<context:component-scan base-package="com.bullbeardevice.*" />
<!-- Hibernate Session Factory -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:database.properties</value>
</list>
</property>
</bean>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${db.driverClassName}" />
<property name="url" value="${db.url}" />
<property name="username" value="${db.username}" />
<property name="password" value="${db.password}" />
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.abc.model" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.jdbc.batch_size">100</prop>
<!-- <prop key="hibernate.hbm2ddl.auto">create-drop</prop> -->
<prop key="hibernate.current_session_context_class">
org.springframework.orm.hibernate4.SpringSessionContext
</prop>
<!-- configuration pool via c3p0 -->
<prop key="hibernate.c3p0.acquire_increment">5</prop>
<prop key="hibernate.c3p0.idle_test_period">600</prop>
<prop key="hibernate.c3p0.max_size">25</prop>
<prop key="hibernate.c3p0.max_statements">25</prop>
<prop key="hibernate.c3p0.min_size">5</prop>
<prop key="hibernate.c3p0.timeout">300</prop>
<prop key="hibernate.connection.release_mode">auto</prop>
<prop key="hibernate.auto_close_session">true</prop>
</props>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
我的database.properties：
#db.driverClassName=com.mysql.jdbc.Driver
db.driverClassName=com.mysql.jdbc.GoogleDriver
db.url=jdbc:google:mysql://xxx:xxx/xxxx
#db.url=jdbc:Oracle:thin:@127.0.0.1:1521/XE
db.username=root
db.password=abc
#hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.show_sql=true
hibernate.cache.use_second_level_cache=false
hibernate.cache.use_query_cache=false
#hibernate.cache.provider_class=net.sf.ehcache.hibernate.EhCacheProvider
#hibernate.cache.provider_class==org.hibernate.cache.EhCacheProvider
#db.sid=XE
# configuration for hibernate search
hibernate.search.default.locking_strategy=simple
#hibernate.search.analyzer=org.apache.lucene.analysis.en.EnglishAnalyzer
hibernate.search.worker.batch_size=100
hibernate.search.indexing_strategy = manual
hibernate.search.default.reader.strategy = shared
hibernate.search.default.worker.thread_pool.size=30
hibernate.search.default.indexwriter.ram_buffer_size=10
hibernate.search.default.indexwriter.merge_max_optimize_size=7
hibernate.search.default.indexwriter.merge_max_size=7
请帮我解决这个问题。我从上周开始就被困住了。