Data source configuration

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mvcdemo?useSSL=false
username=root
jdbc.password=root
jdbc.initialSize=20
jdbc.maxActive=50
jdbc.minIdle=24
jdbc.maxWait=60000
jdbc.minEvictableIdleTimeMillis=300000
jdbc.timeBetweenEvictionRunsMillis=60000
jdbc.validationQuery=SELECT 1
jdbc.testWhileIdle=true
jdbc.testOnBorrow=false
jdbc.testOnReturn=false
jdbc.filters=wall

Note: Please note that there is no JDBC prefix in my configuration above

Spring configuration

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="url" value="${jdbc.url}" />
        <property name="driverClassName" value="${jdbc.driverClassName}" />
        <property name="username" value="${username}" />
        <property name="password" value="${jdbc.password}" />
        <property name="initialSize" value="${jdbc.initialSize}" />
        <property name="maxActive" value="${jdbc.maxActive}" />
        <property name="minIdle" value="${jdbc.minIdle}" />
        <property name="maxWait" value="${jdbc.maxWait}" />
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}" />
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}" />
        <property name="validationQuery" value="${jdbc.validationQuery}" />
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}" />
        <property name="testOnBorrow" value="${jdbc.testOnBorrow}" />
        <property name="testOnReturn" value="${jdbc.testOnReturn}" />
        <property name="filters" value="${jdbc.filters}" />
        <property name="proxyFilters">
            <list>
                <ref bean="stat-filter" />
                <ref bean="log-filter"/>
            </list>
        </property>
    </bean>

At this point, the following error will be reported when accessing the database after starting the project

[com.alibaba.druid.pool.DruidDataSource] - create connection SQLException, url: jdbc:mysql://localhost:3306/mvcdemo?useSSL=false, errorCode 1045, state 28000
java.sql.SQLException: Access denied for user '????…§'@'localhost' (using password: YES)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:873)
    at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1710)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1226)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2205)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2236)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2035)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    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:425)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
    at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:149)
    at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:786)
    at com.alibaba.druid.filter.FilterEventAdapter.connection_connect(FilterEventAdapter.java:38)
    at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:143)
    at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)
    at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:143)
    at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:786)
    at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:143)
    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1515)
    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1578)
    at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2450)

When I add the JDBC prefix to the username attribute, the problem is solved