java现有代码抛出此错误[Hibernate+c3p0+Oracle11g]：资源池无法从其主工厂或源获取资源

Question

当我试图连接到一个测试数据库，该数据库的设置如图所示，我面临的所有错误如所述

大部分配置都来自工作的生产环境，但我无法连接到测试数据库

我尝试过各种方法，但都无法正常运行

我可以通过PLSQL developer或SQLPLUS等其他方法连接测试数据库

我遇到的一系列错误是：

org.hibernate.exception.GenericJDBCException: Cannot open connection
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Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
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Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
  at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.j‌​ava:1422)
  at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResour‌​cePool.java:606) 
  at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool‌​.java:526)
  at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse‌​(C3P0PooledConnectionPool.java:756) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0P‌​ooledConnectionPool.java:683)

这是我的hibernate配置文件：

<session-factory>

    <property name="hibernate.connection.url">jdbc:oracle:thin:@ipaddress:1521:dbname</property>
    <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
    <property name="hibernate.connection.username">user</property>
    <property name="hibernate.connection.password">password</property>



    <property name="connection.autoReconnect">true</property>
    <property name="connection.autoReconnectForPools">true</property>
    <property name="connection.is-connection-validation-required">true</property>

    <property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
    <property name="hibernate.c3p0.max_size">1</property>
    <property name="hibernate.c3p0.min_size">1</property>
    <property name="hibernate.c3p0.timeout">50000</property>
    <property name="hibernate.c3p0.max_statements">100</property>
    <property name="hibernate.c3p0.idle_test_period">3000</property>
    <property name="hibernate.c3p0.acquire_increment">1</property>
    <property name="hibernate.c3p0.validate">false</property>


    <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>

    <mapping resource etc>
</session-factory>

有人能帮我解决这个问题吗