Spring Boot-Maven構建錯誤

Question

在為簡單的springboot項目進行maven測試時出現錯誤。 我能夠運行Maven驗證和編譯。

源代碼如下：

 package com.example.demo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Microservice1Application { public static void main(String[] args) { SpringApplication.run(Microservice1Application.class, args); } } 

測試代碼如下：

 package com.example.demo; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; @RunWith(SpringRunner.class) @SpringBootTest public class Microservice1ApplicationTests { @Test public void contextLoads() { } } 

我得到的錯誤如下：

 ------------------------------------------------------------------------------- Test set: com.example.demo.Microservice1ApplicationTests ------------------------------------------------------------------------------- Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.895 sec <<< FAILURE! - in com.example.demo.Microservice1ApplicationTests contextLoads(com.example.demo.Microservice1ApplicationTests) Time elapsed: 0.011 sec <<< ERROR! java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1078) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:857) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:264) at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:228) Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:100) at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:54) 

你能幫忙嗎？

Answer 1

只需閱讀最新的“ Caused by”：

Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
    at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:100)
    at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:54)

因此，您需要在配置xml或yaml中的某處類似以下內容：

hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.connection.driver=com.mysql.jdbc.Driver

在使用MySQL語言的地方，我還指定了MySQL驅動程序（在這種情況下，您應該檢查數據庫是否正確）。

最后，Hibernate配置可能如下所示：

@Configuration
@EnableTransactionManagement
@PropertySource(value = { "classpath:hibernate.properties" })
public class HibernateConfiguration {

    @Autowired
    private Environment environment;

    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setHibernateProperties(hibernateProperties());
        return sessionFactory;
    }

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getRequiredProperty("hibernate.connection.driver"));
        dataSource.setUrl(environment.getRequiredProperty("hibernate.connection.url"));
        dataSource.setUsername(environment.getRequiredProperty("hibernate.connection.username"));
        dataSource.setPassword(environment.getRequiredProperty("hibernate.connection.password"));
        return dataSource;
    }

    private Properties hibernateProperties() {
        Properties properties = new Properties();
        properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
        properties.put("hibernate.hbm2ddl.auto", environment.getRequiredProperty("hibernate.hbm2ddl.auto"));
        return properties;
    }

    @Bean
    @Autowired
    public HibernateTransactionManager transactionManager(SessionFactory s) {
        HibernateTransactionManager txManager = new HibernateTransactionManager();
        txManager.setSessionFactory(s);
        return txManager;
    }

}

在那里，您可以看到我將“ hibernate.dialect”添加為屬性，並將“ hibernate.driver”添加為數據源的一部分