从 Spring 4.xxx 迁移到 Spring 5，保留 EJB 和 Web 模块

Hi All

服务器：Websphere 9。

应用程序在 Spring 4 上运行良好。我们希望迁移到 Spring 5。

我们遇到了 DI（依赖注入）的问题。

Spring 4 中有 EJB 模块（带有消息驱动 Bean）和 Web 模块。

我已经知道他们建议完全迁移到 Spring 或使用一些 Spring CDI-Bridge。https://jira.spring.io/browse/SPR-15154

但我们希望避免改变项目的大部分结构（回归测试、少量时间等......）。

那么有什么方法可以保持结构并迁移到 Spring 5。

web.xml

<web-app id="WebAppId" version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>AppWebModule</display-name>

<context-param>
    <param-name>parentContextKey</param-name>
    <param-value>ear.context</param-value>
</context-param>

<context-param>
    <param-name>contextClass</param-name>
    <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
</context-param>

<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<listener>
    <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
</listener>

<listener>
    <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>

<!-- Start Spring MVC -->
<servlet>
    <servlet-name>Spring MVC Dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextClass</param-name>
        <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
    </init-param>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>com.organization.services.config.ServicesWebAppConfig</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

... rest of file

服务应用程序配置EJB 模块。

@Configuration
@EnableAspectJAutoProxy
@EnableTransactionManagement(proxyTargetClass = true)
@ComponentScan({ "com.organization.services.resources", "com.organizatio.services.jsf", "com.organizatio.services.snoop", "com.organizatio.services.version" })
public class ServicesWebAppConfig extends WebMvcConfigurationSupport {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        super.addDefaultHttpMessageConverters(converters); // Have to call this explicitly to register Default Message Converters.
        converters.add(new MappingJackson2HttpMessageConverter());
    }
}

beanRefContext。 XML

   "bean id='ear.context' 
   class='org.spring.....AnnotationConfigApplicationContext
     constructor-arg
        list         
            type="java.lang.Class">com.organization.services.config.ServicesAppConfig
        list
     constructor-arg

Error:

ERROR

   [6/18/18 12:30:57:980 CEST] 0000012c SystemOut     O [2018-06-18 12:30:57,976] 
   [WebContainer : 5] [ERROR] [] 
   [org.springframework.web.servlet.DispatcherServlet:initServletBean:503]: 
   Context initialization failed
   org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
   creating bean with name 'adminResource1': Unsatisfied dependency expressed 
   through field 'adminService'; nested exception is 
   org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying 
   bean of type 'com.organiazation.services.business.admin.xxxx.AdminService' 
   available: expected at least 1 bean which qualifies as autowire candidate. 
   Dependency annotations: {@javax.inject.Inject()}

之前的解决方案在 Spring 5 中不再适用。SpringBean自动装配拦截器支持已removed.

所以这是我的快速解决方案：

我使用 setter 手动将 Spring bean 注入到我的 EJB（此处为 MDB）中。我的 bean“注入”是一个静态 bean（它在 Spring 的初始化阶段设置一次且永久）。

这是我的EJB :

import javax.ejb.*;
import javax.jms.*;

@TransactionManagement(value = TransactionManagementType.CONTAINER)
@TransactionAttribute(value = TransactionAttributeType.NOT_SUPPORTED)
@MessageDriven(
        name = "messageListenerEJBInstance",
        activationConfig = {
                // configurations ...
        })
public class MessageListenerEJB implements MessageListener {
    // ...
    private static SpringBean springBean;

    @Override
    public void onMessage(Message message) {
        // ...
        
        springBean.someMethod();
        
        // ...
    }

    // ...

    // Setter -> to initialize my bean from the outside
    public void setSpringBean(SpringBean springBean) {
        MessageListenerEJB.springBean = springBean;
    }
}

事情是这样的已初始化 :

<?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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc" 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/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd">

    // ...

    <bean id="bean" class="your.package.SpringBean"/>
    <bean id="messageListenerEJBInstance" class="your.package.MessageListenerEJB">
        <property name="springBean" ref="bean"/>
    </bean>
    
    // ...
</beans>