spring和hibernate配置使用注釋

Question

我試圖使用注釋（沒有xml）從外部屬性文件配置sessionfactory和數據源配置詳細信息，但我得到以下異常。

 @Value("${hibernate.dialect}")
    private String hibernateDialect;
    @Value("${hibernate.show_sql}")
    private String hibernateShowSql;
    @Value("${hibernate.hbm2ddl.auto}")
    private String hibernateHbm2ddlAuto;

    @Value("${hibernate.driverClassName}")
    private String driverClassName;
    @Value("${hibernate.url}")
    private String url;
    @Value("${hibernate.username}")
    private String username;
    @Value("${hibernate.password}")
    private String password;

  @Bean

    public PropertyPlaceholderConfigurer getPropertyPlaceholderConfigurer()
    {
        PropertyPlaceholderConfigurer propertyPlaceholderConfigurer = new PropertyPlaceholderConfigurer();
        propertyPlaceholderConfigurer.setLocation(new ClassPathResource("hibernate.properties"));
        propertyPlaceholderConfigurer.setIgnoreUnresolvablePlaceholders(true);
        return propertyPlaceholderConfigurer;
    }

    @Bean()
    public DataSource getDataSource() {
        System.out.println("**"+driverClassName+"&&"+url+"***"+username+"%%%"+password);
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(driverClassName);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);

        return dataSource;
    }

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

    @Bean
    @Autowired
    public HibernateTemplate getHibernateTemplate(SessionFactory sessionFactory)
    {
        HibernateTemplate hibernateTemplate = new HibernateTemplate(sessionFactory);
        return hibernateTemplate;
    }

    @Bean
    public LocalSessionFactoryBean sessionFactory()
    {
        LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
        localSessionFactoryBean.setDataSource(getDataSource());
        localSessionFactoryBean.setHibernateProperties(getHibernateProperties());
        localSessionFactoryBean.setPackagesToScan(new String[]{"com.foodeebuddee"});
        return localSessionFactoryBean;
    }



    @Bean
    public Properties getHibernateProperties()
    {
        System.out.println("**"+hibernateDialect+"&&"+hibernateShowSql+"***"+hibernateHbm2ddlAuto);
        Properties properties = new Properties();
        properties.put("hibernate.dialect", hibernateDialect);
        properties.put("hibernate.show_sql", hibernateShowSql);
        properties.put("hibernate.hbm2ddl.auto", hibernateHbm2ddlAuto);
        return properties;
    }

我得到的例外。

 Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [com/foodeebuddee/Application.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.orm.hibernate4.LocalSessionFactoryBean com.foodeebuddee.Application.sessionFactory()] threw exception; nested exception is java.lang.IllegalArgumentException: Property 'driverClassName' must not be empty
        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:584)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1089)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:984)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getSingletonFactoryBeanForTypeCheck(AbstractAutowireCapableBeanFactory.java:840)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryBean(AbstractAutowireCapableBeanFactory.java:771)
        at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:539)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:384)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:353)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:463)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:456)
        at org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration$EmbeddedServletContainerCustomizerBeanPostProcessorRegistrar.registerBeanDefinitions(EmbeddedServletContainerAutoConfiguration.java:110)
        at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromRegistrars(ConfigurationClassBeanDefinitionReader.java:317)
        at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:139)
        at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:116)
        at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:321)
        at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:240)
        at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:254)
        at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:94)
        at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:609)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:552)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:293)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:749)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:738)
        at com.foodeebuddee.Application.main(Application.java:191)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
    Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.orm.hibernate4.LocalSessionFactoryBean com.foodeebuddee.Application.sessionFactory()] threw exception; nested exception is java.lang.IllegalArgumentException: Property 'driverClassName' must not be empty
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:188)
        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:573)
        ... 30 more
    Caused by: java.lang.IllegalArgumentException: Property 'driverClassName' must not be empty
        at org.springframework.util.Assert.hasText(Assert.java:162)
        at org.springframework.jdbc.datasource.DriverManagerDataSource.setDriverClassName(DriverManagerDataSource.java:124)
        at com.foodeebuddee.Application.getDataSource(Application.java:111)
        at com.foodeebuddee.Application.sessionFactory(Application.java:140)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:166)
        ... 31 more

任何建議表示贊賞。

Answer 1

解決方案是錯誤本身::::

com.foodeebuddee.Application.sessionFactory（）]拋出異常; 嵌套異常是java.lang.IllegalArgumentException：在org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate（SimpleInstantiationStrategy.java:188）中，屬性'driverClassName'不能為空

提供合適的driverClassName，如com.mysql.jdbc.Driver

Answer 2

driverClassName對於在Spring中創建會話工廠是必不可少的，但它的值是空的，首先你可以做更多的日志記錄，看看為什么driverClassName的值不會到來。

Answer 3

getPropertyPlaceholderConfigurer()方法應該是靜態的。

更多細節可以在這里找到