错误描述：使用的是C3P0连接池　　

　　　　　Spring整合Mybatis时出现错误

java.sql.SQLException: Access denied for user 'GC'@'localhost' (using password: YES)
DEBUG [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1] - An exception occurred while acquiring a poolable resource. Will retry.

java.sql.SQLException: Access denied for user 'GC'@'localhost' (using password: YES)

    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)

    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)

    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)

    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:835)

    at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:455)

    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:240)

    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199)

    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)

Process finished with exit code -1

问题解决：下图中的username、password 改为name、pwd （其实只修改username就可以 为了后面不出问题最好俩个都修改）

注意：我的错误是因为没有按照C3P0连接池的格式  （这个问题也可能是数据库密码错误）

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