我使用Vaadin 7,Spring Data JPA 1.9.4.RELEASE和Vaadin-Spring 1.0.0,我有一些DI問題。Vaadin Spring沒有啓動:依賴注入問題
我選擇不使用Spring的引導,因爲它會自動做太多的事情,我不能「看」和我所遇到的章若干問題的是花了我太多的時間去了解,並找到原因,所以我寧願不開機。
我遇到的問題是DI在根用戶界面而不是根用戶界面的子窗口中工作。
RootUI.java
@SpringUI(path = "/")
public class RootUI extends UI {
@Autowired
private EntityManagerFactory entityManagerFactory; // this one works, but I cannot get EntityManager directly
@Autowired
private ClassService classService; // this one works
@Override
protected void init(VaadinRequest request) {
...
PersonForm form = new PersonForm();
CssLayout layout = new CssLayout();
layout.addComponent(form);
Window subWindow = new Window();
subWindow.setContent(layout);
...
}
}
PersonForm.java
public class PersonForm {
@Autowired
private ClassService classService; // this doesnot work,
public PersonForm(ClassService classService) {
classService.findByName();// since the @Autowired dosenot work, I have to pass the one from rootUI.
}
init() {
classService.findByName(); // null exception
}
}
DBConfig.java
@Configuration
@EnableVaadin
@EnableJpaRepositories(basePackages = {"com.example.person.repository"})
@EnableTransactionManagement
public class DBConfig {
@Bean
public DataSource dataSource() {
HikariConfig config = new HikariConfig();
config.setDriverClassName("com.mysql.jdbc.Driver");
config.setJdbcUrl("jdbc:mysql://localhost:3306/test?autoReconnect=true&useSSL=false");
config.setUsername("root");
config.setPassword("root");
config.setMaximumPoolSize(20);
HikariDataSource dataSource = new HikariDataSource(config);
return dataSource;
}
@Bean
public EntityManagerFactory entityManagerFactory() {
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
vendorAdapter.setGenerateDdl(true);
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setJpaVendorAdapter(vendorAdapter);
factory.setDataSource(dataSource());
factory.setPackagesToScan("com.example.person");
factory.setPersistenceProviderClass(HibernatePersistenceProvider.class);
Properties jpaProperties = new Properties();
jpaProperties.put("hibernate.dialect", "org.hibernate.dialect.MySQLInnoDBDialect");
jpaProperties.put("hibernate.hbm2ddl.auto", "update");
factory.setJpaProperties(jpaProperties);
factory.afterPropertiesSet();
return factory.getObject();
}
}
Spring可以爲它管理的組件自動裝入字段。如果你實例化這些對象,Spring將不會知道automagic將不會發生。你想要做的是告訴Spring'PersonForm'是它的一個組件,並且從它的初始化上下文中請求一個實例。 – Morfic