Question

我对春天不太熟悉，所以添加了与春天相关的一切。

我有一个spring 4 struts 1.x应用程序。

使用struts插件加载Spring上下文，该插件指向spring-context.xml

<plug-in className="org.springframework.web.struts.ContextLoaderPlugIn">
    <set-property property="contextConfigLocation"
    value="/WEB-INF/spring-context.xml"/>
</plug-in>

在spring-context.xml我已按照以下方式配置了Jpa的EntityManager：

<context:component-scan base-package="com.epam.testsystem" />

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="primary"/>
    </bean>
    <!-- Transactions -->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>

我还使用

集成了Spring Security

public class SecurityWebApplicationInitializer
        extends AbstractSecurityWebApplicationInitializer {

    public SecurityWebApplicationInitializer() {
        super(SecurityConfig.class);
    }
}

和

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(securedEnabled = true)
@ImportResource("/WEB-INF/spring-context.xml")
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    public void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService);
    }

    @Override
    public void configure(HttpSecurity http) throws Exception {
        http
                .authorizeRequests()
                    .antMatchers("/welcome.do").hasRole("ADMIN")
                    .and()
                .formLogin()
                    .loginPage("/login.do")
                    .loginProcessingUrl("/login")
                    .failureUrl("/login?error=1")
                    .permitAll()
                    .and()
                .csrf();
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

它的工作没有错误。

现在我决定将EntityManager的配置移到java Config。所以我从spring-context.xml中删除了bean定义，将这些bean添加到SecurityConfig

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
    em.setPersistenceUnitName("primary");
    return em;
}

@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory emf){
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(emf);
    return transactionManager;
}

但现在我得到了这个例外：

引起：org.springframework.beans.factory.BeanCurrentlyInCreationException：创建名为'entityManagerFactory'的bean时出错：请求的bean当前正在创建：是否存在无法解析的循环引用？“

我认为发生这种情况是因为我在UserDaoImpl中使用了@PersistenceContext注释，然后才将其导入Java Config。

那么处理这个问题最干净的方法是什么？

由于

Answer 1

建议的解决方案之一是

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {

    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
    em.setPersistenceUnitName("primary");
    return em;
}

    @Bean
    public PlatformTransactionManager transactionManager(){

        JpaTransactionManager transactionManager = new JpaTransactionManager();
                                                // SOlution below
        transactionManager.setEntityManagerFactory(entityManagerFactory());
        return transactionManager;
    }

这里我们通过entityManagerFactory（）传递依赖bean 如果这符合解决方案，请告诉我

Answer 2

我通过创建单独的PersistenceConfig

使其成功

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages="com.epam.testsystem.repository")
public class PersistenceConfig {
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);
        em.setPersistenceUnitName("primary");
        return em;
    }

    @Bean
    public PlatformTransactionManager transactionManager(EntityManagerFactory emf){
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(emf);
        return transactionManager;
    }
}

并将Java Config导入xml config（spring-context.xml）：

<bean class="com.epam.testsystem.config.PersistenceConfig" />

spring 4 struts 1.x混合xml和java配置

2 个答案: