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具体报错如下:

2018-11-12 16:14:21.704 ERROR 9752 --- [eate-1537371824] com.alibaba.druid.pool.DruidDataSource   : create connection SQLException, url: jdbc:mysql://localhost:3306/*****?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false, errorCode 1193, state HY000

java.sql.SQLException: Unknown system variable 'query_cache_size'

    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)     at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)     at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)     at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2547)     at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2505)     at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1370)     at com.mysql.jdbc.ConnectionImpl.loadServerVariables(ConnectionImpl.java:3862)     at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3290)     at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2299)     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)  

 

解决方法:本人是MySQL版本问题,用的是MySQL8.0,将MySQL驱动改成如下:5.1.6

   
     
    
     mysql
      
    
     mysql-connector-java
      
    
     5.1.6
    
   

修改后的连接信息如下:

spring:    datasource:        type: com.alibaba.druid.pool.DruidDataSource        driverClassName: com.mysql.jdbc.Driver        druid:            first:  #数据源1                url: jdbc:mysql://localhost:3306/数据库名称?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8                username: *****                password: *****

........................

or  2020/05/28 加

spring:  http:    encoding:      charset: UTF-8      force: true      enabled: true  datasource:    type: com.alibaba.druid.pool.DruidDataSource    driverClassName: com.mysql.jdbc.Driver    platform: mysql    url: jdbc:mysql://127.0.0.1:3306/数据库名称?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT%2B8    username: XXXXXX    password: XXXXXX    #初始化链接数    initialSize: 5    #最小的空闲连接数    minIdle: 5    #最大活动连接数    maxActive: 20    #从池中取连接的最大等待时间，单位ms    maxWait: 60000    #每XXms运行一次空闲连接回收器    timeBetweenEvictionRunsMillis: 60000    #池中的连接空闲XX毫秒后被回收    minEvictableIdleTimeMillis: 300000    validationQuery: SELECT1FROMDUAL    testWhileIdle: true    testOnBorrow: false    testOnReturn: false    filters: stat,wall,log4j    logSlowSql: true

 

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