Java 为什么我会得到这些例外？

我在尝试连接到远程数据库时遇到这些异常，但我不知道这背后的确切原因是什么？我不知道这是权限问题还是网络问题，还是c3po连接池问题。你能建议从哪里开始解决这些异常吗

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
    at sun.reflect.GeneratedConstructorAccessor27.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.Util.getInstance(Util.java:386)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
    at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2238)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2159)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    at sun.reflect.GeneratedConstructorAccessor11.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
    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:152)
    at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1074)
    at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1061)
    at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
    at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1796)
    at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:620)
Caused by: java.sql.SQLException: Access denied for user 'su01'@'10.15.9.137' (using password: YES)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3597)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3529)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:935)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4101)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1300)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2337)
    at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2177)
    ... 18 more
2015-09-07 16:47:31,990 [C3P0PooledConnectionPoolManager-Helper Thread-#0] WARN [v2.resourcepool.BasicResourcePool]  - Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@dbe4e5 is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
2015-09-07 16:47:37,998 [C3P0PooledConnectionPoolManager-Helper Thread-#0] WARN [v2.resourcepool.BasicResourcePool]  - com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@17a3d13 -- 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: 
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
    at sun.reflect.GeneratedConstructorAccessor27.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.Util.getInstance(Util.java:386)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
    at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2238)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2159)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    at sun.reflect.GeneratedConstructorAccessor11.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
    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:152)
    at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1074)
    at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1061)
    at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
    at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1796)
    at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:620)
Caused by: java.sql.SQLException: Access denied for user (using password: YES)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3597)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3529)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:935)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4101)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1300)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2337)
    at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2177)
    ... 18 more

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:无法创建到数据库服务器的连接。尝试重新连接3次。放弃。
位于sun.reflect.GeneratedConstructorAccessor27.newInstance（未知源）
位于sun.reflect.delegatingConstructor或AccessorImpl.newInstance（未知源）
位于java.lang.reflect.Constructor.newInstance（未知源）
位于com.mysql.jdbc.Util.HandleneInstance（Util.java:411）
位于com.mysql.jdbc.Util.getInstance（Util.java:386）
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:1013）
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:987）
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:982）
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:927）
位于com.mysql.jdbc.ConnectionImpl.connectWithRetries（ConnectionImpl.java:2238）
位于com.mysql.jdbc.ConnectionImpl.createNewIO（ConnectionImpl.java:2159）
位于com.mysql.jdbc.ConnectionImpl（ConnectionImpl.java:792）
位于com.mysql.jdbc.JDBC4Connection（JDBC4Connection.java:47）
位于sun.reflect.GeneratedConstructorAccessor11.newInstance（未知源）
位于sun.reflect.delegatingConstructor或AccessorImpl.newInstance（未知源）
位于java.lang.reflect.Constructor.newInstance（未知源）
位于com.mysql.jdbc.Util.HandleneInstance（Util.java:411）
位于com.mysql.jdbc.ConnectionImpl.getInstance（ConnectionImpl.java:381）
位于com.mysql.jdbc.NonRegisteringDriver.connect（NonRegisteringDriver.java:305）
位于com.mchange.v2.c3p0.DriverManagerDataSource.getConnection（DriverManagerDataSource.java:134）
位于com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection（WrapperConnectionPoolDataSource.java:182）
在com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection（WrapperConnectionPoolDataSource.java:171）
位于com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.AcquisiteSource（C3P0PooledConnectionPool.java:152）
位于com.mchange.v2.resourcepool.BasicResourcePool.doAcquire（basicResourceSourcePool.java:1074）
在com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndedCreementPendingAcquiresWithInLockonSuccess（BasicResourcePool.java:1061）
在com.mchange.v2.resourcepool.BasicResourcePool.access$800（BasicResourcePool.java:32）
位于com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run（BasicResourcePool.java:1796）
位于com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run（ThreadPoolAsynchronousRunner.java:620）
原因：java.sql.SQLException:用户'su01'@'10.15.9.137'的访问被拒绝（使用密码：是）
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:1073）
在com.mysql.jdbc.MysqlIO.checkErrorPacket上（MysqlIO.java:3597）
在com.mysql.jdbc.MysqlIO.checkErrorPacket上（MysqlIO.java:3529）
在com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:935）上
位于com.mysql.jdbc.MysqlIO.secureAuth411（MysqlIO.java:4101）
位于com.mysql.jdbc.MysqlIO.doHandshake（MysqlIO.java:1300）
位于com.mysql.jdbc.ConnectionImpl.coreConnect（ConnectionImpl.java:2337）
位于com.mysql.jdbc.ConnectionImpl.connectWithRetries（ConnectionImpl.java:2177）
... 还有18个
2015-09-07 16:47:31990[C3P0PooledConnectionPoolManager帮助线程-#0]警告[v2.resourcepool.BasicResourcePool]-无法获取资源com.mchange.v2.resourcepool。BasicResourcePool@dbe4e5正在中断等待资源签出的所有线程。将重试以响应新的客户端请求。
2015-09-07 16:47:37998[C3P0PooledConnectionPoolManager帮助线程-#0]警告[v2.resourcepool.BasicResourcePool]-com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@17a3d13--获取尝试失败！！！清算未决收购。在尝试获取所需的新资源时，我们未能成功获取超过允许的最大获取尝试次数（30）。上次采集尝试异常：
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:无法创建到数据库服务器的连接。尝试重新连接3次。放弃。
位于sun.reflect.GeneratedConstructorAccessor27.newInstance（未知源）
位于sun.reflect.delegatingConstructor或AccessorImpl.newInstance（未知源）
位于java.lang.reflect.Constructor.newInstance（未知源）
位于com.mysql.jdbc.Util.HandleneInstance（Util.java:411）
位于com.mysql.jdbc.Util.getInstance（Util.java:386）
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:1013）
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:987）
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:982）
位于com.mysql.jdbc.SQLError.createSQLException（SQLError.java:927）
位于com.mysql.jdbc.ConnectionImpl.connectWithRetries（ConnectionImpl.java:2238）
位于com.mysql.jdbc.ConnectionImpl.createNewIO（ConnectionImpl.java:2159）
位于com.mysql.jdbc.ConnectionImpl（ConnectionImpl.java:792）
位于com.mysql.jdbc.JDBC4Connection（JDBC4Connection.java:47）
位于sun.reflect.GeneratedConstructorAccessor11.newInstance（未知源）
位于sun.reflect.delegatingConstructor或AccessorImpl.newInstance（未知源）
位于java.lang.reflect.Constructor.newInstance（未知源）
位于com.mysql.jdbc.Util.HandleneInstance（Util.java:411）
位于com.mysql.jdbc.ConnectionImpl.getInstance（ConnectionImpl.java:381）
位于com.mysql.jdbc.NonRegisteringDriver.connect（NonRegisteringDriver.java:305）
位于com.mchange.v2.c3p0.DriverManagerDataSource.getConnection（DriverManagerDataSource.java:134）
位于com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection（WrapperConnectionPoolDataSource.java:182）
Access denied for user 'su01'@'10.15.9.137' (using password: YES)