There are many possibilities for this error result. The problem I encountered is that in the configuration file of druid, the key of the key-value pair is wrong, and it must be exactly the same as the official document.
Error prompt
2月 03, 2020 3:18:47 下午 com.alibaba.druid.pool.DruidDataSource error
严重: init datasource error
java.sql.SQLException: Access denied for user ''@'localhost' (using password: YES)
at mysql.connector.java@8.0.19/com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
at mysql.connector.java@8.0.19/com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
at mysql.connector.java@8.0.19/com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
at mysql.connector.java@8.0.19/com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
at mysql.connector.java@8.0.19/com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)
at mysql.connector.java@8.0.19/com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
at mysql.connector.java@8.0.19/com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197)
at druid@1.0.9/com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:148)
at druid@1.0.9/com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:211)
at druid@1.0.9/com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142)
at druid@1.0.9/com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1377)
at druid@1.0.9/com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1431)
at druid@1.0.9/com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:618)
at druid@1.0.9/com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:915)
at druid@1.0.9/com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:911)
at JDBC_DAO/com.www.utils.DruiUtils.getConnection(DruiUtils.java:49)
at JDBC_DAO/daoImpl.UserImpl.geTable_user02s(UserImpl.java:24)
at JDBC_DAO/serviceImpl.UserServiceImpl.geTable_user02s(UserServiceImpl.java:21)
at JDBC_DAO/test.Test.main(Test.java:25)
Configuration file error
