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  

找了好久很多資料,

嘗試檢查 鏈接地址用戶名密碼正確性及大小寫驅動,嘗試檢查代碼內部是否配置出錯,在進行ping數據庫所在主機及測試網絡通暢,可以登錄plsql後,

查詢驅動並且嘗試更換驅動jar包無果之後公司大神發現

這個異常的原因是:隊友提供的數據庫主機地址不對!!!!!!!!

其他正常遇到的問題可以參考以下資料:

參考資料地址:https://yq.aliyun.com/wenzhang/show_149232

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

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

完整異常:

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 異常: 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)