如何在osgi插件项目中启动camelcontext？

【问题标题】：How to start camelcontext in osgi plugin project?如何在osgi插件项目中启动camelcontext？
【发布时间】：2013-02-03 07:49:17
【问题描述】：

我无法让我的 Camel 路由分别在 OSGI(Equinox)-Bundle 和插件项目中工作。

路线如下：

public class Example2Routes extends RouteBuilder {
    @Override
    public void configure() throws Exception {
        this.from("cxf:http://localhost:8080/exampleWS?wsdlURL=META-INF/exampleWS.wsdl&dataFormat=PAYLOAD").to("stream:out");
    }
}

应该启动 Camel 上下文的我的测试类：

public class Test {
    public static void run() throws Exception {

        DefaultCamelContext camelContext = new DefaultCamelContext();
        camelContext.addRoutes(new Example2Routes());
        camelContext.start();
            }
    }

捆绑包在 Eclipse 中使用 OSGI Framework Run 配置启动。

控制台：

osgi> 19:53:17.712  DEBUG  org.apache.cxf.common.logging.LogUtils:140     Using org.apache.cxf.common.logging.Slf4jLogger for logging.
19:53:17.728  INFO   org.apache.cxf.bus.osgi.CXFActivator:88        Adding the extensions from bundle org.apache.camel.camel-cxf-transport (64) [org.apache.camel.component.cxf.transport.CamelTransportFactory]
19:53:17.743  INFO   org.apache.camel.impl.osgi.Activator:84        Camel activator starting
19:53:17.743  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: InvokerInf
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.eclipse.osgi.services
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.eclipse.equinox.util
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: InvokerImpl
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: ch.qos.logback.core
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: ch.qos.logback.classic
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: wsdl4j
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.commons.logging
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: com.springsource.javax.activation
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: javax.mail
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.ws.xmlschema.core
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.cxf.bundle
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.springframework.transaction
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.camel.camel-cxf
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/cxf in bundle org.apache.camel.camel-cxf
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/cxfbean in bundle org.apache.camel.camel-cxf
19:53:17.760  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/cxfrs in bundle org.apache.camel.camel-cxf
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.neethi
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: slf4j.api
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: com.springsource.org.apache.xml.resolver
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: javax.ws.rs.javax.ws.rs-api
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.camel.camel-spring
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/spring-event in bundle org.apache.camel.camel-spring
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/spel in bundle org.apache.camel.camel-spring
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.springframework.beans
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.commons.codec
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: target
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: log4j
19:53:17.775  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.springframework.core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.springframework.expression
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.eclipse.equinox.ds
19:53:17.791  INFO   org.apache.camel.impl.osgi.Activator:87        Camel activator started
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/bean in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/browse in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/class in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/dataset in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/direct in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/direct-vm in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/file in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/language in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/log in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/mock in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/properties in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/ref in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/seda in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/stub in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/test in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/timer in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/validator in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/vm in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/xslt in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/bean in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/constant in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/file in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/header in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/property in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/ref in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/simple in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/tokenize in bundle org.apache.camel.camel-core
19:53:17.791  DEBUG  org.apache.camel.impl.osgi.Activator:143       Found entry: META-INF/services/org/apache/camel/language/xpath in bundle org.apache.camel.camel-core
19:53:17.807  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.camel.camel-cxf-transport
19:53:17.807  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.springframework.context
19:53:17.807  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: CamelOSGIExample
19:53:17.807  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.eclipse.osgi

但是现在如何“启动” CamelContext？没有 osgi，作为标准的 java 应用程序，这个例子可以工作；但是我有一个包含骆驼上下文的主要方法。

我尝试使用 Activator 来启动骆驼上下文：

public class Activator implements BundleActivator {

    @Override
    public void start(BundleContext arg0) throws Exception {

         Test.run();

                }
    }

但这会导致类似

的错误 
Failed to resolve endpoint: cxf://http://localhost:8081/exampleWS?dataFormat=PAYLOAD&wsdlURL=META-INF%2FexampleWS.wsdl due to: No component found with scheme: cxf

虽然控制台说：

20:13:04.319  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.ws.xmlschema.core
20:13:04.319  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.cxf.bundle
20:13:04.319  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.springframework.transaction
20:13:04.319  DEBUG  org.apache.camel.impl.osgi.Activator:97        Bundle started: org.apache.camel.camel-cxf
20:13:04.319  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/cxf in bundle org.apache.camel.camel-cxf
20:13:04.319  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/cxfbean in bundle org.apache.camel.camel-cxf
20:13:04.319  DEBUG  org.apache.camel.impl.osgi.Activator:128       Found entry: META-INF/services/org/apache/camel/component/cxfrs in bundle org.apache.camel.camel-cxf

可能是因为在启动所有需要的包/组件之前调用了 run 方法，所以 Activator 中的 Test.run() 出现问题？ 但是如何启动骆驼上下文呢？

更新 1

更改为 OsgiDefaultCamelContext。做了一些进口。现在我得到了：

The bundle "org.apache.httpcomponents.httpclient_4.2.0 [119]" could not be resolved. Reason: Missing Constraint: Import-Package: org.apache.http; version="4.2.0"

&

 The bundle "CamelOSGIExample_1.0.0.qualifier [120]" could not be resolved. Reason: Missing Constraint: Import-Package: org.apache.http.nio.conn; version="4.0.0.beta3"

但是找不到这个包..

更新 2：

原因

java.lang.ClassNotFoundException: org.apache.http.nio.conn.ClientAsyncConnectionManager

我下载了 httpasyncclient-osgi-4.0-beta3.jar 并将 org.apache.http.nio.conn 添加到导入中。

在那之后我遇到了问题，以前的捆绑包需要例如org.apache.http.client 或 org.apache.http.auth。 所以我下载了 httpclient-osgi-4.2.1.jar 和 httpclient-osgi-4.2.2.jar （因为有些导入需要 4.2.1 版和一些4.2.2），其中包含所需的类。但是尽管将此捆绑包添加到午餐配置中，我还是得到了

org.osgi.framework.BundleException: Exception in siServer.Activator.start() of bundle CamleOSGIExample.
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:734)
...
Caused by: java.lang.NoClassDefFoundError: org/apache/http/nio/conn/ClientAsyncConnectionManager
    at java.lang.Class.getDeclaredConstructors0(Native Method)
...
Caused by: java.lang.ClassNotFoundException: org.apache.http.nio.conn.ClientAsyncConnectionManager
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)
...
Root exception:
java.lang.NoClassDefFoundError: org/apache/http/nio/conn/ClientAsyncConnectionManager
    at java.lang.Class.getDeclaredConstructors0(Native Method)
...
Caused by: java.lang.ClassNotFoundException: org.apache.http.nio.conn.ClientAsyncConnectionManager
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)

我不明白这个异常，因为我在导入中添加了 org.apache.http.nio.conn。

搜索需要 org.apache.http.nio.conn 的包并找到 cxf-2.7.3.jar。但我认为使用骆驼的 cfx 组件我也需要这个包..

【问题讨论】：

  • 您需要安装导入所需的这些捆绑包。您可以在 maven Central 上使用高级搜索来查找包含这些包的 JAR：search.maven.org
  • 顺便说一句，如果您使用 Apache Karaf / ServiceMix，那么在该容器中部署和使用 Camel 会更容易，使用特性和 spring-dm 或蓝图 xml 文件来引导您的应用程序。那么你就不需要摆弄 OSGi Activator 之类的了。
  • 很遗憾，这不是我的决定。
  • 查看 Apache Camel 的 features.xml 文件，你可以看到所有需要的 osgi 包 camel-cxf 等需要 - 很多。 repo2.maven.org/maven2/org/apache/camel/karaf/apache-camel/…
  • 哇。有没有简单的方法来获取它们？

标签： osgi apache-camel


【解决方案1】：

使用 OSGi 时需要使用 OsgiDefaultCamelContext。这个类应该在camel-core-osgi中。

【讨论】：

  • 嗯，也遇到了一些错误。我需要从 Activator 的 start() 方法中调用 Test.run() 吗？
  • 易卜生先生，如何在 karaf 4 中安装 camel-core-osgi 功能？
【解决方案2】：

你可以试试为什么惰性实例化。如果一个包的启动策略设置为'lazy'，它只会加载类并在它的一个类被另一个包加载时启动。 http://www.osgi.org/Design/LazyStart

【讨论】：

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