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spring-boot - CamelContext 必须指定在：HttpMessage@0x36ed8347

问题描述

我在 spring boot 应用程序中使用 camelServlet，camel kafka，我收到了这个我无法理解的错误

当我尝试调用配置为 REST DSL 路由的 get 端点时，出现以下错误

路线：

rest().get("/getBatchID")
                .to("direct:getBatchID");

我已将骆驼 servlet bean 定义如下：

  @Bean
    public ServletRegistrationBean camelServletRegistrationBean() {
        ServletRegistrationBean registration = new ServletRegistrationBean(new CamelHttpTransportServlet(), "/camel/*");
        registration.setName("CamelServlet");
        return registration;

堆栈跟踪：

2018-11-25 23:22:10,066|INFO |http-nio-9000-exec-2|o.a.c.c.s.CamelHttpTransportServlet - Initialized CamelHttpTransportServlet[name=CamelServlet, contextPath=]
2018-11-25 23:22:10,183|ERROR|http-nio-9000-exec-2|o.a.c.c.C.[.[.[.[CamelServlet] - Servlet.service() for servlet [CamelServlet] in context with path [] threw exception
java.lang.IllegalArgumentException: CamelContext must be specified on: HttpMessage@0x36ed8347
    at org.apache.camel.util.ObjectHelper.notNull(ObjectHelper.java:342)
    at org.apache.camel.impl.DefaultMessage.createHeaders(DefaultMessage.java:254)
    at org.apache.camel.impl.DefaultMessage.setHeader(DefaultMessage.java:171)
    at org.apache.camel.http.common.HttpMessage.<init>(HttpMessage.java:41)
    at org.apache.camel.http.common.CamelServlet.doService(CamelServlet.java:169)
    at org.apache.camel.http.common.CamelServlet.service(CamelServlet.java:74)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

发出获取请求时是否需要在标头中添加 camelContext ？

标签： spring-bootspring-camel

解决方案

这是因为 HTTPMessage 扩展了 DefaultMessage ，它存在于同一个包中，存在超过 1 个 jar 依赖项。

类org.apache.camel.impl.DefaultMessage存在于 2 个罐子中。

  1. 活动 MQ 全部
  2. 骆驼核心 JAR。

解决方案是您使用 activemq-client jar 或调整您的 .MF 文件

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