无法打开 JDBC 连接以执行 DDL

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【中文标题】无法打开 JDBC 连接以执行 DDL【英文标题】：Unable to open JDBC Connection for DDL execution 【发布时间】：2019-06-10 05:16:02 【问题描述】：

我的 spring bean 出现以下错误，

创建名为“employeeRepositoryDAOImple”的 bean 时出错： 通过方法“setSessionFactory”表达的不满足的依赖关系 参数0；嵌套异常是 org.springframework.beans.factory.BeanCreationException：错误 创建在类路径中定义的名称为“sessionFactory”的bean 资源 [config.xml]：调用 init 方法失败；嵌套的 异常是 org.hibernate.exception.JDBCConnectionException: Unable 为 DDL 执行打开 JDBC 连接

客户端.java 

public class Client 
    public static void main(String arg[]) 

        AbstractApplicationContext ctx = new     ClassPathXmlApplicationContext("config.xml");
        EmployeeService employeeService = (EmployeeService) ctx.getBean("empoyeService");

        Employee employee1 = new Employee(100001, "Alex", "Account");
        Employee employee2 = new Employee(100002, "Sam", "HR");

        employeeService.insert(employee1);
        employeeService.insert(employee2);
        System.out.println("Records are successfully added..");
        ctx.close();

Entity.java

@Entity
public class Employee 
@Id
private int empId;
private String empName;
private String department;
public Employee() 
    super();

public Employee(int empId,String empName,String deptName)

    super();
    this.empId=empId;
    this.empName=empName;
    this.department=deptName;


public int getEmpId() 
    return empId;

public void setEmpId(int empId) 
    this.empId = empId;

public String getEmpName() 
    return empName;

public void setEmpName(String empName) 
    this.empName = empName;

public String getDepartment() 
    return department;

public void setDepartment(String department) 
    this.department = department;

@Override
public String toString()

    return "Employee Empid="+empId+" empName="+empName+" department="+department;

EmployeeService.java

@Service("empoyeService")
public class EmployeeServiceImpl implements EmployeeService 
@Autowired
EmployeeRepository emprepo;
@Override
public void insert(Employee employee) 
    // TODO Auto-generated method stub
    emprepo.insert(employee);


@Override
public int delete(int empid) 
    // TODO Auto-generated method stub
    return emprepo.delete(empid);



EmployeeRepositoryDAOImple.java
   @Repository
   public class EmployeeRepositoryDAOImple implements EmployeeRepository
private SessionFactory sessionFactory;
@Autowired
public void setSessionFactory(SessionFactory sessionFactory) 
    this.sessionFactory = sessionFactory;

@Override
public void insert(Employee employee) 
    // TODO Auto-generated method stub
    Session session = sessionFactory.openSession();
    Transaction tx = session.beginTransaction();
    session.save(employee);
    tx.commit();
    session.close();

配置.xml

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- Define Service and Repository beans using auto scan feature of         Spring -->
<context:component-scan base-package="com.orm.employee.dao,com.orm.employee.Service" />

<!-- Define DataSource bean using DriverManagerDataSource class of Spring --> 
<bean id="myDataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/myschema"></property>
    <property name="username" value="root"></property>
    <property name="password" value="xxxx"></property>
</bean>
<!-- Define sessionFactory bean of Spring class -->
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
    <property name="dataSource" ref="myDataSource" />
    <property name="packagesToScan" value="com.orm.employee.dao" />
    <property name="hibernateProperties">
        <value>
            hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
            hibernate.hbm2ddl.auto=update

        </value>
    </property>
</bean>


Exception
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main"      org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'employeeRepositoryDAOImple': Unsatisfied dependency expressed through method 'setSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [config.xml]: Invocation of init method failed; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to open JDBC Connection for DDL execution
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:676)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
at com.orm.employee.client.Client.main(Client.java:14)
Caused by: org.springframework.beans.factory.BeanCreationException:      Error creating bean with name 'sessionFactory' defined in class path resource [config.xml]: Invocation of init method failed; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to open JDBC Connection for DDL execution
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1745)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1237)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1164)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:668)
... 15 more
Caused by: org.hibernate.exception.JDBCConnectionException: Unable to open JDBC Connection for DDL execution
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:48)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)
at org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl.getIsolatedConnection(DdlTransactionIsolatorNonJtaImpl.java:69)
at org.hibernate.tool.schema.internal.exec.ImprovedExtractionContextImpl.getJdbcConnection(ImprovedExtractionContextImpl.java:60)
at org.hibernate.tool.schema.internal.exec.ImprovedExtractionContextImpl.getJdbcDatabaseMetaData(ImprovedExtractionContextImpl.java:67)
at org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl.getTables(InformationExtractorJdbcDatabaseMetaDataImpl.java:329)
at org.hibernate.tool.schema.extract.internal.DatabaseInformationImpl.getTablesInformation(DatabaseInformationImpl.java:120)
at org.hibernate.tool.schema.internal.GroupedSchemaMigratorImpl.performTablesMigration(GroupedSchemaMigratorImpl.java:65)
at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.performMigration(AbstractSchemaMigrator.java:207)
at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.doMigration(AbstractSchemaMigrator.java:114)
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:183)
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:72)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:310)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:467)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:708)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724)
at org.springframework.orm.hibernate5.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:615)
at org.springframework.orm.hibernate5.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:599)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741)
... 25 more
Caused by:     com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL client
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:353)
at com.mysql.jdbc.Util.getInstance(Util.java:336)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:985)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2938)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:855)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3337)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1217)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1930)
at com.mysql.jdbc.Connection.<init>(Connection.java:716)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
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:353)
at com.mysql.jdbc.Connection.getInstance(Connection.java:295)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:208)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:154)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:145)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:205)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:169)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:180)
at org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl.getIsolatedConnection(DdlTransactionIsolatorNonJtaImpl.java:43)
... 42 more

【问题讨论】：

您需要发布完整的异常堆栈跟踪，您显示的消息可能没有结束，因此可能有其他错误导致 JDBCConnectionException 【参考方案1】：

我遇到了同样的问题，我建议您通过查看配置（application.properties）来修改建立与数据库的连接的方式：

## Spring Datasource Configuration
spring.datasource.url=jdbc:mysql://localhost:3306/(package_name)?useSSL=false&serverTimezone=UTC&useLegacyDatetimeCode=false
spring.datasource.username=****
spring.datasource.password=****

## JPA Hibernate Properties
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.hibernate.ddl-auto=update

【讨论】：

【参考方案2】：

这对我有用

mysql>  CREATE USER 'scilla'@'172.17.0.1' IDENTIFIED BY 'password';
mysql>  GRANT ALL PRIVILEGES ON *.* TO 'scilla'@'172.17.0.1' WITH GRANT OPTION;
mysql> flush privileges; 
mysql> exit


spring:
  datasource:
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/scilla
    username: scilla
    password: password
  jpa:
    hibernate:
      ddl-auto: validate
    database: mysql
    show-sql: true
    database-platform: org.hibernate.dialect.MySQL5Dialect
    hibernate.ddl-auto: update

【讨论】：

【参考方案3】： 
Check you are hibernating configuration

spring.datasource.url=jdbc:mysql://localhost:3306/spring_boot_db
spring.datasource.username=root
spring.datasource.password=r00t
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto = update

【讨论】：

【参考方案4】：

在我的情况下，root 用户没有正确的 autentication 权限。 我知道，因为登录到数据库只是提示：

sudo mysql

所以，一旦登录 MySQL，我就输入了：

SELECT user,authentication_string,plugin,host FROM mysql.user;

并在root用户的plugin栏中看到了auth_socket的值。 所以，我输入了：

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

然后重启tomcat，问题就解决了。

以后，必须登录mysql输入：

mysql -u root -pPASSWORD

希望它可以帮助某人:)

【讨论】：

【参考方案5】：

我通过更正 src > main > application.properties 文件中的 mysql 凭据解决了这个问题

检查您的 mysql 凭据是否正确以及 mysql 服务器是否正在运行。

【讨论】：

【参考方案6】：

解决方案：

将 MySql 连接器 jar 从 5.1 升级到 8.0 解决了问题 - 我的代码不是问题。

【讨论】：

【参考方案7】：

您能否对您的代码进行以下更改。 

<property name="hibernateProperties">
     <props>
        <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
        <prop key="hibernate.hbm2ddl.auto">update</prop>
    </props>
</property>

并添加以下属性并从 sessionFactory 中删除 @Autowired

<bean id="employeeDAO" class="yourbasepackage.EmployeeRepositoryDAOImple"> 
  <property name="sessionFactory" ref="sessionFactory" />
</bean>

【讨论】：

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