修改好数据库连接信息后，启动报错

数据库已经生成好了的 这是application-dev.yml配置文件 img[//cdn.renren.io/41c72201806251706279319.png] [pre] spring: datasource: type: com.alibaba.druid.pool.DruidDataSource driverClassName: com.mysql.jdbc.Driver druid: first: #数据源1 url: jdbc:mysql://localhost:3306/renren_fast?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8 username: root password: root second: #数据源2 url: jdbc:mysql://localhost:3306/renren_fast?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8 username: root password: root initial-size: 10 max-active: 100 min-idle: 10 max-wait: 60000 pool-prepared-statements: true max-pool-prepared-statement-per-connection-size: 20 time-between-eviction-runs-millis: 60000 min-evictable-idle-time-millis: 300000 #validation-query: SELECT 1 FROM DUAL test-while-idle: true test-on-borrow: false test-on-return: false stat-view-servlet: enabled: true url-pattern: /druid/* #login-username: admin #login-password: admin filter: stat: log-slow-sql: true slow-sql-millis: 1000 merge-sql: false wall: config: multi-statement-allow: true [/pre] 报错信息： img[//cdn.renren.io/7d309201806251706368741.png] [pre] 2018-06-25 17:03:03.553 ERROR 13880 --- [reate-399715995] com.alibaba.druid.pool.DruidDataSource : create connection SQLException, url: jdbc:mysql://localhost:3306/renren_fast?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8, errorCode 0, state 08001 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:404) at com.mysql.jdbc.Util.getInstance(Util.java:387) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:917) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860) at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2332) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2085) at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:795) 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:404) at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:327) at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156) at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218) at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150) at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1560) at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1623) at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2468) Caused by: java.lang.NullPointerException: null at com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:3005) at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1916) at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1845) at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1215) at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2255) at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2286) ... 16 common frames omitted [/pre]