在application.yml的属性中找不到具有键[http-client.timers['http-get'].name]的属性

Question

我有一个Spring Boot应用程序，它使用Apache Camel来定义和控制数据的路由。这些路由是通过XML DSL定义的，并且具有属性占位符，以允许定义的路由的可变性。

当我试图定义和使用一个项目集合时，我得到了一个错误：

Caused by: java.lang.IllegalArgumentException: Property with key [http-client.timers['http-get'].name] not found in properties from text: timer:{{http-client.timers['http-get'].name}}?delay={{http-client.timers['http-get'].start-delay}}&fixedRate=true&period={{http-client.timers['http-get'].period}}&repeatCount={{http-client.timers['http-get'].repeat-count}}

application.yml：

---

camel:
  springboot:
    name: MissionServices
    main-run-controller: true

http-client:
  server:
    host: localhost
    port: 9100
  endpoint: chars?size=500
  timers:
    - http-get:
      name: http-get
      start-delay: 0
      period: 1000
      repeat-count: 5
    - http-post:
      name: http-post
      start-delay: 0
      period: 5000
      repeat-count: 5

camel-context.xml：

...
  <camelContext id="camel-context"
    xmlns="http://camel.apache.org/schema/spring">

    <route id="http-get">
      <from
        uri="timer:{{http-client.timers['http-get'].name}}?delay={{http-client.timers['http-get'].start-delay}}&amp;fixedRate=true&amp;period={{http-client.timers['http-get'].period}}&amp;repeatCount={{http-client.timers['http-get'].repeat-count}}" />
      <log loggingLevel="INFO" message="start - http-get" />
      <setHeader name="HTTP_METHOD">
        <constant>GET</constant>
      </setHeader>
      <to
        uri="http:{{http-client.server.host}}:{{http-client.server.port}}/{{http-client.endpoint}}" />
      <log loggingLevel="INFO" message="end - http-get" />
    </route>

    <route id="http-post">
      <from uri="direct:start-http-post" />
      <log loggingLevel="INFO" message="start - http-post" />
      <setHeader name="HTTP_METHOD">
        <constant>POST</constant>
      </setHeader>
      <setHeader name="CONTENT_TYPE">
        <constant>application/json</constant>
      </setHeader>
      <to
        uri="http:{{http-client.server.host}}:{{http-client.server.port}}/{{http-client.endpoint}}" />
      <log loggingLevel="INFO" message="end - http-post" />
    </route>

  </camelContext>
...

是YAML的结构不正确，还是我在路由定义中使用了错误的语法来访问属性？

Answer 1

首先，yml中的缩进是不正确的。

其次，结构不太正确。您正在寻找的是一个对象映射，其中包含字段name、start-delay、period和repeat-count。但您已将其声明为列表。

您正在尝试通过键(http-get)查找对象。您不能使用key搜索列表。你可以用索引搜索列表。你需要的是一张地图。

正确的yaml结构应为

http-client:
  server:
    host: localhost
    port: 9100
  endpoint: chars?size=500
  timers:
     http-get:
        name: http-get
        start-delay: 0
        period: 1000
        repeat-count: 5
     http-post:
        name: http-post
        start-delay: 0
        period: 5000
        repeat-count: 5

要访问您正在查找的值，应该如下所示

{{http-client.timers.http-get.name}}

Answer 2

嗯，http-client.timers['http-get'].name声明name嵌套在http-get中，而您的YAML中：

  timers:
    - http-get:
      name: http-get
      start-delay: 0
      period: 1000
      repeat-count: 5

name:是http-get:的兄弟(它们共享相同的缩进级别，有关这种情况下的缩进处理的详细信息，请使用see this answer )。此外，您在这里启动了一个序列(使用-)，但是路径没有对序列进行任何索引。你可能想要

  timers:
    http-get:
      name: http-get
      start-delay: 0
      period: 1000
      repeat-count: 5