Apache Camel box component file dowload, how do I use the output parameter? - apache-camel

Question

I have been trying to download a file from Box using the Apache Camel Box component. I cannot seem to unserstand how to use the required parameter output with the uri box://files/downloadFile.
I am able to upload files fine (code not listed), so I am confident that this is a problem configure this particular endpoint and not with, for example, my org.apache.camel.component.box.BoxConfiguration.
How do I use camel-box and box://files/downloadFile to download a file? Specifically what I am expected to pass as the output parameter of the endpoint uri?
I've been referring to this documentation:
https://github.com/apache/camel/blob/master/components/camel-box/camel-box-component/src/main/docs/box-component.adoc
Here's what I am working with:
camel-core 2.19.3,camel-box 2.19.3,camel-spring-javaconfig 2.19.3
Here's the route, BoxRoute.java that I cant figure out:
package [REDACTED];
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
#Component
public class BoxRoute extends RouteBuilder{
private static final Logger LOG = LoggerFactory.getLogger(BoxRoute.class);
#Override
public void configure() throws Exception {
from("box://files/downloadFile?fileId=[REDACTED]&output=#outputStream") //I expect this to refer to the outputStream #Bean
.process(new Processor() {
#Override
public void process(Exchange exchange) throws Exception {
for(String key: exchange.getProperties().keySet()){
LOG.debug("ex prop {} = {}", key, exchange.getProperty(key));
}
for(String key: exchange.getIn().getHeaders().keySet()){
LOG.debug("he prop {} = {}", key, exchange.getIn().getHeader(key));
}
}
})
.to("file:c:/_/dat/camel/out");
}
}
So I think I'm giving this uri what it needs. Namely, a reference to my outputStream been which is an OutputStream, defined in the next listing.
My application's main method is in BoxApplication.java:
package [REDACTED];
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import org.apache.camel.spring.javaconfig.CamelConfiguration;
import org.apache.camel.spring.javaconfig.Main;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
#Configuration
#ComponentScan
#ImportResource("classpath:/META-INF/spring/box-context.xml")
public class BoxApplication extends CamelConfiguration{
public static void main(String[] args) throws Exception {
Main main = new Main();
main.setConfigClass(BoxApplication.class);
main.setDuration(10);
main.run();
}
#Bean()
public OutputStream outputStream(){
System.out.println("I AM GETTING REGISTERED"); // I see this in stdout, so this bean is available to Camel (right?)
return new ByteArrayOutputStream();
}
}
The contents of box-context.xml are (I can use camel box to upload, so I doubt my problems is here):
?xml version="1.0" encoding="UTF-8"?>
beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<bean id="box" class="org.apache.camel.component.box.BoxComponent">
<property name="configuration">
<bean class="org.apache.camel.component.box.BoxConfiguration">
<property name="userName" value="[REDACTED]" />
<property name="userPassword" value="[REDACTED]" />
<property name="clientId" value="[REDACTED]" />
<property name="clientSecret" value="[REDACTED]" />
<property name="authenticationType" value="STANDARD_AUTHENTICATION" />
</bean>
</property>
</bean>
Alas, I get this error, and I am stumped. Any help would be appreciated.
2017-10-07 18:05:00.128 [main] INFO o.s.c.a.AnnotationConfigApplicationContext(583) - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext#bd8db5a: startup date [Sat Oct 07 18:05:00 EDT 2017]; root of context hierarchy
2017-10-07 18:05:00.216 [main] INFO o.s.b.f.xml.XmlBeanDefinitionReader(317) - Loading XML bean definitions from class path resource [META-INF/spring/box-context.xml]
2017-10-07 18:05:00.500 [main] INFO o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker(325) - Bean 'boxApplication' of type [com.hqcllc.box.BoxApplication$$EnhancerBySpringCGLIB$$4e7e4dfa] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
I AM GETTING REGISTERED
Exception in thread "main" org.apache.camel.spring.javaconfig.CamelSpringJavaconfigInitializationException: org.apache.camel.RuntimeCamelException: Error invoking downloadFile with {output=, listener=Consumer[box://files/downloadFile?fileId=[REDACTED]&output=%23outputStream], fileId=[REDACTED]}: object is not an instance of declaring class
at org.apache.camel.spring.javaconfig.RoutesCollector.onApplicationEvent(RoutesCollector.java:88)
at org.apache.camel.spring.javaconfig.RoutesCollector.onApplicationEvent(RoutesCollector.java:33)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:883)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
at org.apache.camel.spring.javaconfig.Main.createDefaultApplicationContext(Main.java:148)
at org.apache.camel.spring.Main.doStart(Main.java:154)
at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
at org.apache.camel.main.MainSupport.run(MainSupport.java:168)
at com.hqcllc.box.BoxApplication.main(BoxApplication.java:22)
Caused by: org.apache.camel.RuntimeCamelException: Error invoking downloadFile with {output=, listener=Consumer[box://files/downloadFile?fileId=[REDACTED]&output=%23outputStream], fileId=[REDACTED]}: object is not an instance of declaring class
at org.apache.camel.util.component.ApiMethodHelper.invokeMethod(ApiMethodHelper.java:514)
at org.apache.camel.component.box.BoxConsumer.doStart(BoxConsumer.java:98)
at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
at org.apache.camel.impl.DefaultCamelContext.startService(DefaultCamelContext.java:3514)
at org.apache.camel.impl.DefaultCamelContext.doStartOrResumeRouteConsumers(DefaultCamelContext.java:3831)
at org.apache.camel.impl.DefaultCamelContext.doStartRouteConsumers(DefaultCamelContext.java:3767)
at org.apache.camel.impl.DefaultCamelContext.safelyStartRouteServices(DefaultCamelContext.java:3687)
at org.apache.camel.impl.DefaultCamelContext.doStartOrResumeRoutes(DefaultCamelContext.java:3451)
at org.apache.camel.impl.DefaultCamelContext.doStartCamel(DefaultCamelContext.java:3305)
at org.apache.camel.impl.DefaultCamelContext.access$000(DefaultCamelContext.java:202)
at org.apache.camel.impl.DefaultCamelContext$2.call(DefaultCamelContext.java:3089)
at org.apache.camel.impl.DefaultCamelContext$2.call(DefaultCamelContext.java:3085)
at org.apache.camel.impl.DefaultCamelContext.doWithDefinedClassLoader(DefaultCamelContext.java:3108)
at org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:3085)
at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
at org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:3022)
at org.apache.camel.spring.javaconfig.RoutesCollector.onApplicationEvent(RoutesCollector.java:84)
... 12 more
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.camel.util.component.ApiMethodHelper.invokeMethod(ApiMethodHelper.java:506)
... 28 more
This is my first Camel project fyi.