java.sql.SQLException：用户“root”@“localhost”的访问被拒绝。无法创建与数据库服务器的连接答案

【问题标题】：java.sql.SQLException: Access denied for user 'root'@'localhost'. Could not create connection to database serverjava.sql.SQLException：用户“root”@“localhost”的访问被拒绝。无法创建与数据库服务器的连接
【发布时间】：2020-01-07 22:38:17
【问题描述】：

我的 Spring Boot 启动应用程序在我的本地系统（即 Windows 10）上正常运行，但是当我尝试在本地安装 MySql 的 Ubuntu 18.04 操作系统上部署应用程序时。它在启动应用程序时抛出错误说

原因：java.sql.SQLException: Access denied for user 'root'@'localhost'

下面是我的application.properties文件

spring.datasource.url=jdbc:mysql://localhost:3306/madagascar?autoReconnect=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=qwerty
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.hibernate.ddl-auto =update
server.port=8080

这是我的pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>co.yabx</groupId>
    <artifactId>kyc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>kyc</name>
    <description>KYC</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <executable>true</executable>
                </configuration>
            </plugin>
        </plugins>
    </build>


</project>

这是完整的错误

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_221]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_221]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_221]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_221]
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.Util.getInstance(Util.java:408) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:898) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:887) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:861) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2096) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2021) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:776) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_221]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_221]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_221]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_221]
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:310) ~[tomcat-jdbc-8.5.15.jar!/:na]
        at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:203) ~[tomcat-jdbc-8.5.15.jar!/:na]
        at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:735) [tomcat-jdbc-8.5.15.jar!/:na]
        at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:667) [tomcat-jdbc-8.5.15.jar!/:na]
        at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:482) [tomcat-jdbc-8.5.15.jar!/:na]
        at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:154) [tomcat-jdbc-8.5.15.jar!/:na]
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:118) [tomcat-jdbc-8.5.15.jar!/:na]
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:107) [tomcat-jdbc-8.5.15.jar!/:na]
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:131) [tomcat-jdbc-8.5.15.jar!/:na]
        at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) [hibernate-core-5.0.12.Final.jar!/:5.0.12.Final]
        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:180) [hibernate-core-5.0.12.Final.jar!/:5.0.12.Final]
        at org.hibernate.tool.schema.internal.TargetDatabaseImpl.prepare(TargetDatabaseImpl.java:38) [hibernate-core-5.0.12.Final.jar!/:5.0.12.Final]
        at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:57) [hibernate-core-5.0.12.Final.jar!/:5.0.12.Final]
        at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:134) [hibernate-core-5.0.12.Final.jar!/:5.0.12.Final]
        at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:101) [hibernate-core-5.0.12.Final.jar!/:5.0.12.Final]
        at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:472) [hibernate-core-5.0.12.Final.jar!/:5.0.12.Final]
        at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:444) [hibernate-core-5.0.12.Final.jar!/:5.0.12.Final]
        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:879) [hibernate-entitymanager-5.0.12.Final.jar!/:5.0.12.Final]
        at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60) [spring-orm-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353) [spring-orm-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:370) [spring-orm-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:359) [spring-orm-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) [spring-beans-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) [spring-beans-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) [spring-beans-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) [spring-beans-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) [spring-beans-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) [spring-beans-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) [spring-beans-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) [spring-beans-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1078) [spring-context-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:857) [spring-context-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) [spring-context-4.3.9.RELEASE.jar!/:4.3.9.RELEASE]
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.5.4.RELEASE.jar!/:1.5.4.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.4.RELEASE.jar!/:1.5.4.RELEASE]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.4.RELEASE.jar!/:1.5.4.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.4.RELEASE.jar!/:1.5.4.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.4.RELEASE.jar!/:1.5.4.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.4.RELEASE.jar!/:1.5.4.RELEASE]
        at co.yabx.kyc.app.KYCApplication.main(KYCApplication.java:10) [classes!/:1.0]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_221]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_221]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_221]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_221]
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [kyc-1.0.jar:1.0]
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [kyc-1.0.jar:1.0]
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:50) [kyc-1.0.jar:1.0]
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51) [kyc-1.0.jar:1.0]
Caused by: java.sql.SQLException: Access denied for user 'root'@'localhost'
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1714) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1224) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2190) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2037) ~[mysql-connector-java-5.1.46.jar!/:5.1.46]
        ... 58 common frames omitted

请帮助我启动应用程序。

【问题讨论】：

你可以从命令行连接吗？
@Andronicus 是的，我可以使用命令行连接到 mysql，但是我的 Spring Boot 应用程序无法连接。
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)的可能重复
@RameshSubramanian 是的，帮助了我。谢谢

标签： java mysql spring spring-boot spring-mvc

【解决方案1】：

sudo mysql

接下来，使用以下命令检查您的每个 MySQL 用户帐户使用的身份验证方法：

从 mysql.user 中选择用户、身份验证字符串、插件、主机；

输出

+------------------+-------------------------------------------+-----------------------+-----------+
| user             | authentication_string                     | plugin                | host      |
+------------------+-------------------------------------------+-----------------------+-----------+
| root             |                                           | auth_socket           | localhost |
| mysql.session    | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | mysql_native_password | localhost |
| mysql.sys        | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | mysql_native_password | localhost |
| debian-sys-maint | *CC744277A401A7D25BE1CA89AFF17BF607F876FF | mysql_native_password | localhost |
+------------------+-------------------------------------------+-----------------------+-----------+
4 rows in set (0.00 sec)

您可以看到 root 用户实际上使用 auth_socket 插件进行身份验证。要将 root 帐户配置为使用密码进行身份验证，请运行以下 ALTER USER 命令。请务必将密码更改为您选择的强密码，并注意此命令将更改您在步骤 2 中设置的 root 密码：

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

然后，运行 FLUSH PRIVILEGES 告诉服务器重新加载授权表并使您的新更改生效：

冲洗特权；

再次检查每个用户使用的身份验证方法，以确认 root 不再使用 auth_socket 插件进行身份验证：

从 mysql.user 中选择用户、身份验证字符串、插件、主机；

输出

+------------------+-------------------------------------------+-----------------------+-----------+
| user             | authentication_string                     | plugin                | host      |
+------------------+-------------------------------------------+-----------------------+-----------+
| root             | *3636DACC8616D997782ADD0839F92C1571D6D78F | mysql_native_password | localhost |
| mysql.session    | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | mysql_native_password | localhost |
| mysql.sys        | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | mysql_native_password | localhost |
| debian-sys-maint | *CC744277A401A7D25BE1CA89AFF17BF607F876FF | mysql_native_password | localhost |
+------------------+-------------------------------------------+-----------------------+-----------+
4 rows in set (0.00 sec)

您可以在此输出中看到 root MySQL 用户现在使用密码进行身份验证。在您自己的服务器上确认后，您可以退出 MySQL shell：

退出

【讨论】：