卡拉夫：从我自己的罐子里漏课

Question

$ jar tvf myproject-1.0-SNAPSHOT.jar
   455 Tue Jul 26 11:25:10 UTC 2016 META-INF/MANIFEST.MF
     0 Tue Jul 26 11:25:10 UTC 2016 META-INF/
     0 Tue Jul 26 11:25:10 UTC 2016 META-INF/maven/
     0 Tue Jul 26 11:25:10 UTC 2016 META-INF/maven/com.petewall/
     0 Tue Jul 26 11:25:10 UTC 2016 META-INF/maven/com.petewall/myproject/
   143 Tue Jul 26 11:25:10 UTC 2016 META-INF/maven/com.petewall/myproject/pom.properties
  3418 Tue Jul 26 11:25:06 UTC 2016 META-INF/maven/com.petewall/myproject/pom.xml
     0 Tue Jul 26 11:25:10 UTC 2016 OSGI-INF/
     0 Tue Jul 26 11:25:10 UTC 2016 OSGI-INF/blueprint/
  1376 Tue Jul 26 11:20:12 UTC 2016 OSGI-INF/blueprint/blueprint-bean.xml
   961 Tue Jul 26 11:20:12 UTC 2016 OSGI-INF/blueprint/blueprint-service.xml
     0 Tue Jul 26 11:25:10 UTC 2016 com/
     0 Tue Jul 26 11:25:10 UTC 2016 com/petewall/
   143 Tue Jul 26 11:24:56 UTC 2016 com/petewall/Hello.class
  1022 Tue Jul 26 11:24:56 UTC 2016 com/petewall/HelloBean.class
   676 Tue Jul 26 11:20:12 UTC 2016 log4j.properties

karaf@root()> bundle:diag  98
Camel Blueprint Route (98)
--------------------------
Status: GracePeriod
Blueprint
7/26/16 6:26 PM
Missing dependencies:
(objectClass=com.petewall.Hello)

但是，甚至可以使用Karaf的exports命令找到这些类：

karaf@root()> exports
Package Name                     | Version        | ID | Bundle Name
-----------------------------------------------------------------------------
...
com.petewall                     | 1.0.0.SNAPSHOT | 98 | myproject
...

和classs命令：

karaf@root()> classes
...
com/petewall/Hello.class
com/petewall/HelloBean.class

我对所有这些技术（Karaf,Camel,OSGi,等等）都很陌生，所以我肯定我遗漏了一些东西。拜托，谁能给我指点一下这里的正确方向吗？

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="..." xmlns:xsi="..." xmlns:cm="..." xsi:schemaLocation="...">
  <cm:property-placeholder persistent-id="HelloBean" update-strategy="reload">
    <cm:default-properties>
      <cm:property name="greeting" value="Hi from Camel" />
    </cm:default-properties>
  </cm:property-placeholder>

  <bean id="helloBean" class="com.petewall.HelloBean">
    <property name="say" value="${greeting}"/>
  </bean>

  <camelContext id="blueprint-bean-context" xmlns="http://camel.apache.org/schema/blueprint">
    <route id="timerToLog">
      <from uri="timer:foo?period=5000"/>
      <setBody>
        <method ref="helloBean" method="hello"/>
      </setBody>
      <log message="The message contains ${body}"/>
      <to uri="mock:result"/>
    </route>
  </camelContext>
</blueprint>

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="..." xmlns:xsi="..." xmlns:cm="..." xsi:schemaLocation="...">
  <reference id="helloService" interface="com.petewall.Hello" />
  <camelContext id="blueprint-service-context" xmlns="http://camel.apache.org/schema/blueprint">
    <route id="timerToLog">
      <from uri="timer:foo?period=5000"/>
      <setBody>
        <method ref="helloService" method="hello"/>
      </setBody>
      <log message="The message contains ${body}"/>
      <to uri="mock:result"/>
    </route>
  </camelContext>
</blueprint>

Answer 1

Blueprint报告的“缺失依赖项”实际上是缺失的OSGi服务。

很难确定，因为您还没有发布蓝图XML，但错误消息强烈暗示了这一点。您可能有一个 元素，它引用了com.petewall.hellow服务。

是否有任何包提供com.petewall.hellow的实例作为服务？请注意，包中是否存在具有此名称的类文件是不相关的。也许你搞错了，你的包应该提供服务？你能从更高的层面解释一下你想做什么吗？