How to create a Servlet component?

[janylj]

Hello,

Camel is pretty new to me. This might be a simple question but I cannot find
the answer in the web. 

I am following Servlet Component page
(http://camel.apache.org/servlet.html). However, when I start Tomcat, there
are repeating warning message said,

Aug 10, 2009 3:44:03 PM
org.apache.camel.impl.DefaultPollingConsumerPollStrategy rollback
WARNING: Consumer Consumer[servlet:/hello] could not poll endpoint:
servlet:/hello caused by: unsupported protocol: 'servlet'
java.lang.IllegalStateException: unsupported protocol: 'servlet'
        at
org.apache.commons.httpclient.protocol.Protocol.lazyRegisterProtocol(Protocol.java:149)
        at
org.apache.commons.httpclient.protocol.Protocol.getProtocol(Protocol.java:117)
        at org.apache.commons.httpclient.HttpHost.<init>(HttpHost.java:107)
        at
org.apache.commons.httpclient.HttpMethodBase.setURI(HttpMethodBase.java:280)
        at
org.apache.commons.httpclient.HttpMethodBase.<init>(HttpMethodBase.java:220)
        at
org.apache.commons.httpclient.methods.GetMethod.<init>(GetMethod.java:89)
        at
org.apache.camel.component.http.HttpPollingConsumer.createMethod(HttpPollingConsumer.java:110)
        at
org.apache.camel.component.http.HttpPollingConsumer.receiveNoWait(HttpPollingConsumer.java:60)
        at
org.apache.camel.impl.DefaultScheduledPollConsumer.poll(DefaultScheduledPollConsumer.java:45)
        at
org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:98)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
        at
java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:280)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:135)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:65)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:142)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:166)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
        at java.lang.Thread.run(Thread.java:595)

My web.xml has:

        <!-- location of spring xml files -->
        <context-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:camel-config.xml</param-value>
        </context-param>

        <!-- the listener that kick-starts Spring -->
        <listener>
        
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
        
        <servlet>
                <servlet-name>CamelServlet</servlet-name>
                <servlet-class>
                        
org.apache.camel.component.servlet.CamelHttpTransportServlet 
                </servlet-class>
                <init-param>
                        <param-name>matchOnUriPrefix</param-name>
                        <param-value>true</param-value>
                </init-param>
        </servlet>
        
        <servlet-mapping>
                <servlet-name>CamelServlet</servlet-name>
                <url-pattern>/services/*</url-pattern>
        </servlet-mapping>

The camel-context.xml has:

    <!-- create a camel context as to start Camel -->
        <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring";>
                <package>package.has.routebuilderl</package>
        </camelContext>
        <bean id="servlet" 
class="org.apache.camel.component.http.HttpComponent">
                <property name="camelContext" ref="camel" />
        </bean>

The RouteBuilder is exactly what lists in the web page.

from("servlet:///hello").process(new Processor() { 
    public void process(Exchange exchange) throws Exception { 
        String contentType =
exchange.getIn().getHeader(Exchange.CONTENT_TYPE, String.class); 
        String path = exchange.getIn().getHeader(Exchange.HTTP_PATH,
String.class); 
        assertEquals("Get a wrong content type", CONTENT_TYPE, contentType); 
        String charsetEncoding =
exchange.getIn().getHeader(Exchange.HTTP_CHARACTER_ENCODING, String.class); 
        assertEquals("Get a wrong charset name", "UTF-8", charsetEncoding); 
        exchange.getOut().setHeader(Exchange.CONTENT_TYPE, contentType + ";
charset=UTF-8");                         
        exchange.getOut().setHeader("PATH", path); 
        exchange.getOut().setBody("Hello World"); 
    } 
}); 




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