Question

我有一个简单的春季启动应用程序，我正在努力让它运行起来。配置包含一个应用程序上下文（applicationContext.xml）XML，其中包含一堆bean。我有一个Spring应用程序类：

@SpringBootApplication
@Configuration
@ImportResource("classpath:applicationContext.xml")
public class WebCheckApplication {

    private static final Logger logger = Logger.getLogger(WebCheckApplication.class);

    public static void main(String[] args) {
        ApplicationContext ctx = SpringApplication.run(WebCheckApplication.class, args);

        if (logger.isDebugEnabled()) {
            logger.debug("Let's inspect the beans provided by Spring Boot:");

            String[] beanNames = ctx.getBeanDefinitionNames();
            Arrays.sort(beanNames);
            for (String beanName : beanNames) {
                logger.debug(beanName);
            }
        }
    }
}

我有一个@WebListener类，它从ServletContext中抓取WebContext中的一些bean：

@WebListener
public class SystemPropertiesContextInitializer extends SysPropsAlertsFetcher implements ServletContextListener {

    private static final Logger logger = Logger.getLogger(SystemPropertiesContextInitializer.class);

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        //remove the SystemProperties and alert types map object from context
        sce.getServletContext().removeAttribute(BaseAuthenticatedController.SYSPROPS_KEY);
        sce.getServletContext().removeAttribute(BaseAuthenticatedController.ALERT_TYPES_MAP_KEY);
    }

    @Override
    public void contextInitialized(ServletContextEvent sce) {

        SysPropsDataAccess = (SystemPropertiesDataAccess) WebApplicationContextUtils.getRequiredWebApplicationContext(sce.getServletContext()).getBean("SystemPropertiesDataAccess");
        AlertsDataAccess = (AlertDataAccess) WebApplicationContextUtils.getRequiredWebApplicationContext(sce.getServletContext()).getBean("AlertsDataAccess");
        fetchObjects(sce.getServletContext());
    }
}

当我尝试启动应用时，出现以下错误：

SEVERE: Exception sending context initialized event to listener instance of class web.SystemPropertiesContextInitializer
java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener registered?
    at org.springframework.web.context.support.WebApplicationContextUtils.getRequiredWebApplicationContext(WebApplicationContextUtils.java:83)
    at .web.SystemPropertiesContextInitializer.contextInitialized(SystemPropertiesContextInitializer.java:31)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4994)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5492)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

它出现在这一行：

SysPropsDataAccess = (SystemPropertiesDataAccess) WebApplicationContextUtils.getRequiredWebApplicationContext(sce.getServletContext()).getBean("SystemPropertiesDataAccess");

看起来Spring没有创建WebApplicationContext。

Answer 1

大于或等于1.3.0.RC1使用@ServletComponentScan

@ServletComponentScan // <-- This scans for EJB @WebFilter, @WebListener and @WebServlet 
@SpringBootApplication
@ImportResource("classpath:applicationContext.xml")
public class WebCheckApplication {

小于或等于1.2.x使用@Component来扫描侦听器

@Component // <-- This allows the component to be found by @ComponentScan inside of @SpringBootApplication
@WebListener
public class MojoSystemPropertiesContextInitializer extends MojoSysPropsAlertsFetcher implements ServletContextListener {

War Deploy扩展SpringBootServletInitializer

public class WebCheckApplication extends SpringBootServletInitializer {

在1.3.0.RC1中添加了@ServletComponentScan，因此只需注释您的主应用程序配置就应该允许这些内容被选中。否则，将@Component添加到ServletContextListener应该可以正常工作

这个链接讨论了他们当前如何处理@WebFilter他们如何决定处理@WebFilter，他们还讨论了SpringBootServletInitializer以及如果要使用两个项目，它将如何选择处理每个项目两次。还链接到实现新功能的提交。

https://github.com/spring-projects/spring-boot/issues/2290

如果您打算将应用程序部署为war文件，那么您的主配置也可以扩展为SpringBootServletInitializer

http://docs.spring.io/spring-boot/docs/current/reference/html/howto-traditional-deployment.html

Answer 2

所需的只是使Application类扩展SpringBootServletInitializer

Spring boot没有找到WebApplicationContext

2 个答案: