While trying to acquire a needed new resource, we failed to succeed more than the maximum number of

出现如下错误，原因是数据库驱动，我自己一直记着我的MySQL数据库是8.0.13.版本，但是出学ssm配置pom.xml文件的时候把数据库驱动配置错误了。找了半天，后面神奇的突发奇想的觉得要看看驱动兼容不？

Type Exception Report

Message Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

12-Dec-2018 20:49:27.484 信息 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [D:\Apache\Tomcat\webapps\manager]
12-Dec-2018 20:49:27.511 信息 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [D:\Apache\Tomcat\webapps\manager] has finished in [26] ms
12-Dec-2018 20:49:34.518 信息 [http-nio-8080-exec-5] com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getPoolManager Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 2, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 10000, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> 541zm39z192t8491aepomp|15e78232, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 541zm39z192t8491aepomp|15e78232, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> jdbc:mysql://127.0.0.1:3306/friutshop?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 30, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 10, numHelperThreads -> 3, numThreadsAwaitingCheckoutDefaultUser -> 0, preferredTestQuery -> null, properties -> {user=******, password=******}, propertyCycle -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, usesTraditionalReflectiveProxies -> false ]
12-Dec-2018 20:49:35.711 警告 [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1] com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@a605222 -- 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 (2). Last acquisition attempt exception: 
 com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
	at com.mysql.jdbc.Util.getInstance(Util.java:372)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:958)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:937)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:872)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2316)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2069)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
	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)
Caused by: java.lang.NullPointerException
	at com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:2989)
	at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1873)
	at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1802)
	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1206)
	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2239)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2270)
	... 18 more

While trying to acquire a needed new resource, we failed to succeed more than the maximum number of

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