spring – 尝试从xml config将应用程序切换到javaconfig时的BeanDefinitionStoreException异常

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我尝试从xml配置切换到javaconfig时遇到了一些配置问题.

这是有问题的配置类：

@Configuration
@EnableTransactionManagement(mode = AdviceMode.ASPECTJ)
@Profile({ "default", "cloud" })
public class DataConfiguration {

    @Value("${database.driverClassName}")
    private String driverClassName;

    @Value("${database.url}")
    private String url;

    @Value("${database.username}")
    private String username;

    @Value("${database.password}")
    private String password;

    @Value("${database.validationQuery}")
    private String validationQuery;

    @Bean
    public DataSource dataSource() {
        BasicDataSource dataSource = new BasicDataSource();
        dataSource.setDriverClassName(driverClassName);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        dataSource.setTestOnBorrow(Boolean.TRUE);
        dataSource.setTestOnReturn(Boolean.TRUE);
        dataSource.setTestWhileIdle(Boolean.TRUE);
        dataSource.setTimeBetweenEvictionRunsMillis(1800000);
        dataSource.setNumTestsPerEvictionRun(3);
        dataSource.setMinEvictableIdleTimeMillis(1800000);
        dataSource.setValidationQuery(validationQuery);
        dataSource.setMaxActive(5);
        dataSource.setLogAbandoned(Boolean.TRUE);
        dataSource.setRemoveAbandoned(Boolean.TRUE);
        dataSource.setRemoveAbandonedTimeout(10);
        return dataSource;
    }

    @Bean
    public JpaTransactionManager transactionManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory());
        return transactionManager;
    }

    @Bean
    public HibernateJpaVendorAdapter jpaVendorAdapter() {
        return new HibernateJpaVendorAdapter();
    }

    @Bean
    public HibernatePersistence persistenceProvider() {
        return new HibernatePersistence();
    }

    @Bean(name = "entityManagerFactory", destroyMethod = "close")
    public EntityManagerFactory entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setPackagesToScan("com.bignibou.domain");
        entityManagerFactoryBean.setDataSource(dataSource());
        entityManagerFactoryBean.setPersistenceProvider(persistenceProvider());
        entityManagerFactoryBean.setJpaVendorAdapter(jpaVendorAdapter());
        entityManagerFactoryBean.setJpaPropertyMap(propertiesMap());
        return entityManagerFactoryBean.getObject();
    }

    public Map<String, String> propertiesMap() {
        Map<String, String> propertiesMap = new HashMap<>();
        propertiesMap.put("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");
        propertiesMap.put("hibernate.hbm2ddl.auto", "update");
        propertiesMap.put("hibernate.ejb.naming_strategy", "org.hibernate.cfg.ImprovedNamingStrategy");
        propertiesMap.put("hibernate.connection.charSet", "UTF-8");
        propertiesMap.put("hibernate.show_sql", "true");
        propertiesMap.put("hibernate.format_sql", "true");
        propertiesMap.put("hibernate.use_sql_comments", "true");
        return propertiesMap;
    }

    @Bean
    public HibernateExceptionTranslator hibernateExceptionTranslator() {
        return new HibernateExceptionTranslator();
    }

}

这是我得到的例外：

Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public static javax.persistence.EntityManager org.springframework.orm.jpa.SharedEntityManagerCreator.createSharedEntityManager(javax.persistence.EntityManagerFactory)] threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:181)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:570)
    ... 121 more
Caused by: java.lang.NullPointerException
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.initProxyClassLoader(SharedEntityManagerCreator.java:151)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.<init>(SharedEntityManagerCreator.java:143)
    at org.springframework.orm.jpa.SharedEntityManagerCreator.createSharedEntityManager(SharedEntityManagerCreator.java:118)
    at org.springframework.orm.jpa.SharedEntityManagerCreator.createSharedEntityManager(SharedEntityManagerCreator.java:96)
    at org.springframework.orm.jpa.SharedEntityManagerCreator.createSharedEntityManager(SharedEntityManagerCreator.java:64)
    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:160)
    ... 122 more

似乎entityManagerFactory配置存在问题……我错了什么？

解决方法:

如果您未在java配置中的任何位置使用entityManagerFactory()方法,则可以返回LocalContainerEntityManagerFactoryBean对象.

LocalContainerEntityManagerFactoryBean既是InitializingBean又是FactoryBean.这些是Spring可用于初始化bean然后将其添加到上下文的特殊接口.

因此,您可以将方法更改为

@Bean(name = "entityManagerFactory", destroyMethod = "close")
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
    entityManagerFactoryBean.setPackagesToScan("com.bignibou.domain");
    entityManagerFactoryBean.setDataSource(dataSource());
    entityManagerFactoryBean.setPersistenceProvider(persistenceProvider());
    entityManagerFactoryBean.setJpaVendorAdapter(jpaVendorAdapter());
    entityManagerFactoryBean.setJpaPropertyMap(propertiesMap());
    return entityManagerFactoryBean;
}

Spring将负责在方法返回的对象上调用afterPropertiesSet()和getObject(),并将创建的EntityManagerFactory bean添加到上下文中.

This is detailed in the IoC chapter of the Spring documentation.

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