java springcloud项目在微服务中，在filter过滤器使用RedisTemplate，报错，请大佬帮我看下？

Question

java.lang.ClassCastException: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext cannot be cast to org.springframework.web.context.support.XmlWebApplicationContext
at com.knowind.inteBPM.config.AddAuthFilter.init(AddAuthFilter.java:30) ~[classes/:na]
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279) ~[tomcat-embed-core-8.5.14.jar:8.5.14]
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:109) ~[tomcat-embed-core-8.5.14.jar:8.5.14]
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4590) [tomcat-embed-core-8.5.14.jar:8.5.14]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5233) [tomcat-embed-core-8.5.14.jar:8.5.14]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [tomcat-embed-core-8.5.14.jar:8.5.14]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419) [tomcat-embed-core-8.5.14.jar:8.5.14]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409) [tomcat-embed-core-8.5.14.jar:8.5.14]
at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) [na:1.8.0_192]
at java.util.concurrent.FutureTask.run(FutureTask.java) [na:1.8.0_192]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_192]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_192]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_192]
在filter的init方法中加入了下面代码，启动就报错了

public class AddAuthFilter implements Filter {

    RedisTemplate redisTemplate;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        ServletContext sc = filterConfig.getServletContext();
        XmlWebApplicationContext ctx = (XmlWebApplicationContext) WebApplicationContextUtils.getWebApplicationContext(sc);
                if (ctx != null && ctx.getBean("redisTemplate") != null && redisTemplate == null) {
            redisTemplate = (RedisTemplate) ctx.getBean("redisTemplate");
        }
    }
    }

Answer 1

把
XmlWebApplicationContext ctx = (XmlWebApplicationContext) WebApplicationContextUtils.getWebApplicationContext(sc);
改成
ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(sc);