The camel example for using Spring and XML DSL routing has the following config
file:
<beans
xmlns="http://www.springframework.org/schema/beans";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:camel="http://camel.apache.org/schema/spring";
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://camel.apache.org/schema/spring
http://camel.apache.org/schema/spring/camel-spring.xsd";
>
<camelContext xmlns="http://camel.apache.org/schema/spring";>
<route id="helloRoute">
<!-- incoming requests from the servlet is routed -->
<from uri="servlet:hello"/>
<choice>
<when>
<!-- is there a header with the key name? -->
<header>name</header>
<!-- yes so return back a message to the user -->
<transform>
<simple>Hi I am ${sysenv.HOSTNAME}. Hello ${header.name}
how are you today?</simple>
</transform>
</when>
<otherwise>
<!-- if no name parameter then output a syntax to the user -->
<transform>
<constant>Add a name parameter to uri, eg
?name=foo</constant>
</transform>
</otherwise>
</choice>
</route>
</camelContext>
</beans>
I have this running; it puts the designated string on the browser page as a
result after the user enters the correct URL in the browser address bar.
As an exercise, I'm attempting to do this in Java. I have the following
configuration:
<beans
xmlns="http://www.springframework.org/schema/beans";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:camel="http://camel.apache.org/schema/spring";
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://camel.apache.org/schema/spring
http://camel.apache.org/schema/spring/camel-spring.xsd";
>
<camelContext xmlns="http://camel.apache.org/schema/spring";>
<packageScan>
<package>com.api.cameltwo.camelroutes</package>
</packageScan>
</camelContext>
</beans>
and the following Java file:
package com.api.cameltwo.camelroutes;
import org.apache.camel.Expression;
import org.apache.camel.spring.SpringRouteBuilder;
public class IncomingUrlRouteBuilder extends SpringRouteBuilder {
Expression e;
public void configure() {
from("servlet:hello")
.choice()
.when(header("name"))
.transform().simple("Hi ${header.name}")
.to("file:target/messages?fileName=messageOne.txt")
.otherwise()
.transform().constant("no name")
.to("file:target/messages?fileName=messageEmpty.txt")
;
}
}
This works; the indicated string goes back to the browser screen, and gets
written to the file. The thing I don't understand yet is the requirement for
the '.to("file...")' clauses/calls in the Java version. I put in "file..." as
an experiment; it seems that something is required after
'.transform().simple()', but I don't know what. If I don't put that there, the
compiler gives the error:
cannot find symbol
symbol: method otherwise()
location: class ProcessorDefinition<ChoiceDefinition>
So what is it I need to put after the '.when()' to indicate that this route is
done? I gather the .transform().simple() already puts the required output where
it needs to go to get back to the browser result page.
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