Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resou

警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@8b3bdd -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:   
java.lang.NullPointerException  

找了好久很多资料,

尝试检查 链接地址用户名密码正确性及大小写驱动,尝试检查代码内部是否配置出错,在进行ping数据库所在主机及测试网络通畅,可以登录plsql后,

查询驱动并且尝试更换驱动jar包无果之后公司大神发现

这个异常的原因是:队友提供的数据库主机地址不对!!!!!!!!

其他正常遇到的问题可以参考以下资料:

参考资料地址:https://yq.aliyun.com/wenzhang/show_149232

http://blog.csdn.net/piggachen/article/details/69943264

http://blog.csdn.net/xyw591238/article/details/51583996

完整异常:

WARN [com.mchange.v2.resourcepool.BasicResourcePool] - com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7080e376 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: 
java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection
	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)
	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)
	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:254)
	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:386)
	at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:413)
	at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:164)
	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:34)
	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:752)
	at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)
	at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
	at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
	at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
	at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
	at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
	at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)