java - Spring java配置EJB代理不工作

Question

在使用 Spring 的 java 配置类时，我在使 EJB bean 工作时遇到问题。具体来说，我有以下有效的方法:

@Configuration
@ComponentScan(basePackages = "com.company.web.config")
@ImportResource(value = {"classpath:spring-beans.xml"})
public class AppConfig {
}

@Configuration
@ComponentScan(basePackages = "com.company.web")
public class WebConfig extends WebMvcConfigurationSupport {
   // basic Spring MVC setup omitted
}

我的 spring-beans.xml 如下所示:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd">

    <jee:local-slsb id="fooService" jndi-name="java:app/model/FooServiceBean!com.company.ejb.FooService"
      business-interface="com.company.ejb.FooService" />
</beans>

有了这个配置，一切正常，我可以做到这一点:

@Controller
public class HomeController {
    private final FooService fooService;

    @Autowired
    public MyPageController(FooService fooService){
        this.fooService = fooService;
    }

    // request methods
}

现在我尝试删除 XML 文件。根据the documentation local-slsb 应该是等效的

<bean id="fooService"
        class="org.springframework.ejb.access.LocalStatelessSessionProxyFactoryBean">
    <property name="jndiName" value="java:app/model/FooServiceBean!com.company.ejb.FooService"/>
    <property name="businessInterface" value="com.company.ejb.FooService"/>
</bean>

但是，如果我从 AppConfig 中删除 @ImportResource 并改为使用此 @Bean 方法，则部署会失败，因为无法实例化 Controller (没有找到 FooService 的 Autowiring 候选项):

@Bean
    public LocalStatelessSessionProxyFactoryBean fooService(){
        LocalStatelessSessionProxyFactoryBean factory = new LocalStatelessSessionProxyFactoryBean();
        factory.setBusinessInterface(FooService.class);
        factory.setJndiName("java:app/model/FooServiceBean!com.company.ejb.FooService");
        return factory;
    }

有什么想法为什么这行不通吗？我使用的是 Spring 版本 4.0.2。

Answer 1

问题似乎与读取配置的顺序有关，并且可能与双重配置加载有关。

具体来说，引入一个单独的配置类并在 WebConfig 之前导入它似乎可以解决问题，如下所示:

@Configuration
@Import({EJBConfig.class, WebConfig.class})
public class AppConfig {
}

@Configuration
public class EJBConfig {
    @Bean
    public LocalStatelessSessionProxyFactoryBean fooService(){
        LocalStatelessSessionProxyFactoryBean factory = new LocalStatelessSessionProxyFactoryBean();
        factory.setBusinessInterface(FooService.class);
        factory.setJndiName("java:app/model/FooServiceBean!com.company.ejb.FooService");
        return factory;
    }
}

@Configuration
@ComponentScan(basePackages = "com.company.web")
public class WebConfig extends WebMvcConfigurationSupport {
   // basic Spring MVC setup omitted
}