Question

我应该先说明我使用的是Camel 2.10.3和GAE SDK 1.7.1。

我刚将以下代码打包到我的CamelServlet中，并将WAR部署到GAE的本地开发者应用服务器实例：

public class CamelServlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        RouteBuilder routeBuilder = new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from("direct:start").process(new Processor() {
                    @Override
                    public void process(Exchange arg0) throws Exception {
                        logger.warning("I am inside a Camel route!");
                    }
                }).to("direct:end");
            }
        };

        CamelContext camelContext = new DefaultCamelContext();

        try {
            camelContext.addRoutes(routeBuilder);
            camelContext.start();
            Thread.sleep(10000);
            camelContext.stop();
        }
        catch(Exception e) {
            logger.warning("Error: " + e.getMessage());
        }
    }
}

当我转到http://localhost:8888/camel（这是我映射CamelServlet的地方）时，我得到了一个堆栈跟踪：

java.lang.NoClassDefFoundError: java.lang.management.ManagementFactory is a restricted class. Please see the Google  App Engine developer's guide for more details.
    at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
    at org.apache.camel.management.DefaultManagementAgent.findOrCreateMBeanServer(DefaultManagementAgent.java:364)
    at org.apache.camel.management.DefaultManagementAgent.createMBeanServer(DefaultManagementAgent.java:348)
    at org.apache.camel.management.DefaultManagementAgent.doStart(DefaultManagementAgent.java:253)
    at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:60)
    at org.apache.camel.management.DefaultManagementStrategy.start(DefaultManagementStrategy.java:209)
    at org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:62)
    at org.apache.camel.management.ManagementStrategyFactory.create(ManagementStrategyFactory.java:40)
    at org.apache.camel.impl.DefaultCamelContext.createManagementStrategy(DefaultCamelContext.java:2490)
    at org.apache.camel.impl.DefaultCamelContext.getManagementStrategy(DefaultCamelContext.java:2310)
    at org.apache.camel.impl.DefaultCamelContext.doStartCamel(DefaultCamelContext.java:1499)
    at org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:1444)
    at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:60)
    at org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:1412)
    at com.myapp.server.servlets.CamelServlet.doGet(Unknown Source)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

受限的？！？！骆驼路线/公共汽车不应该在GAE上运行吗？！？ Camel有一个GAE组件（Camel-GAE），我认为是一种验证形式，你实际上可以在GAE上运行Camel。但是现在我担心这只是为了从GAE端点消费，而实际上并不意味着在GAE上运行......

因此要么无法在GAE上运行/启动Camel路由，要么我需要一种特殊的方式来配置路由对象（DefaultCamelContext等）以避免违反GAE限制类。或者，正在发生一些完全不同的事情。有什么想法吗？提前谢谢！

更新

通过camelContext.disableJMX();对JMX进行诽谤后，我得到一个新的（非常相似的）异常：

java.lang.NoClassDefFoundError: javax.naming.InitialContext is a restricted class. Please see the Google  App Engine developer's guide for more details.
    at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
    at org.apache.camel.impl.JndiRegistry.createContext(JndiRegistry.java:103)
    at org.apache.camel.impl.JndiRegistry.getContext(JndiRegistry.java:92)
    at org.apache.camel.impl.JndiRegistry.lookup(JndiRegistry.java:65)
    at org.apache.camel.impl.JndiRegistry.lookup(JndiRegistry.java:47)
    at org.apache.camel.impl.PropertyPlaceholderDelegateRegistry.lookup(PropertyPlaceholderDelegateRegistry.java:62)
    at org.apache.camel.impl.DefaultCamelContext.doStartCamel(DefaultCamelContext.java:1557)
    at org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:1444)
    at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:60)
    at org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:1412)
    at com.myapp.server.servlets.CamelServlet.doGet(Unknown Source)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

Answer 1

关闭JMX，你应该没问题。

// spring xml
<camel:camelContext id="camelContext">
   <!-- JMX is not supported in GAE -->
   <camel:jmxAgent id="agent" disabled="true"/>
   ...

// or in your case, java DSL
CamelContext camelContext = new DefaultCamelContext(new SimpleRegistry());
camelContext.disableJMX();

<强>更新如果您使用的是DefaultCamelContext，则可能希望避免使用默认的JNDI注册表。而是在创建上下文时创建SimpleRegistry（请参阅上面的代码）。 spring config camel context没有默认值，因为它使用spring注册表。

证明有效： http://camelcloud.appspot.com/

Camel路线不能在Google App Engine上运行吗？

1 个答案: