Re: Cannot write null body to file error !

Marco Westermann Mon, 25 Mar 2013 08:12:16 -0700

Hi,

first you need a basic understanding of the route parts (endpoints) youare using. If I understand you correct you have files in your sourcedirectory which you want to move to a destination directory at a giventime?! Then you have three alternatives how to archive this.


1.
poll a directory with the file consumer  endpoint

<from uri="file://src/data"/>

<to uri="file:C:\Data\FuseJars\messages"/>

That would move all files which appears in the src folder to themessages folder. If you now want to move the files on a specified time,you can only start the route at that time. For that have a look at:http://camel.apache.org/how-can-i-stop-a-route-from-a-route.html

2. Your problem is, that the body of the message has to contain the filecontent you want to move. The quartz consumer endpoint you use justsends out an empty body like Christian already explained.To set the content of the messagebody to the filecontent you can use apollenrich. Have a look here: http://camel.apache.org/content-enricher.html


then your route would look similar to:

<from uri="quartz://myQuarzJob?cron=0+16+*+*+*+?"/>
  <log message="Writing message to Folder"/>
  <pollEnrich uri="file://src/data?fileName=data.txt"/>
  <to uri="file:C:\Data\FuseJars\messages"/>

3. Use a java bean which moves the files with pure java code

<from uri="quartz://myQuarzJob?cron=0+16+*+*+*+?"/>

    <to uri="bean:fileMover"/>

For how to use beans in camel have a look here:http://camel.apache.org/bean.html

I hope this helps understanding how camel works. I also can recommendthe book "camel in action" which gives a good overview of how camelworks and dives you into the different aspects of using camel.


regards, Marco




Am 25.03.2013 15:34, schrieb bru1900:

Christian,

So in this case, a new file is being written into the target folder with
the Content "Camel Rocks".

But am looking to move a file from the source folder to the destination...
how can i do that? using quartz schedule !

Thank you,
Remya


On Fri, Mar 22, 2013 at 5:56 PM, Christian Mueller [via Camel] <
ml-node+s465427n5729705...@n5.nabble.com> wrote:

<route id="simple">
   <from uri="quartz://src/data?cron=0+16+*+*+*+?"/>
   <log message="Writing message to Folder"/>
   <setBody><constant>Camel rocks</constant></setBody>
   <to uri="file:C:\Data\FuseJars\messages"/>
</route>

Best,
Christian

On Fri, Mar 22, 2013 at 10:15 PM, bru1900 <[hidden 
email]<http://user/SendEmail.jtp?type=node&node=5729705&i=0>>
wrote:

Am sorry about my lack of understanding.

But by adding <setBody><constant>Camel rocks</constant></setBody> to the
file endpoint you mean? which file?

This is my context file(that am executing) and the other is my msg file

present in src/data)


On Fri, Mar 22, 2013 at 5:07 PM, Christian Mueller [via Camel] <
[hidden email] <http://user/SendEmail.jtp?type=node&node=5729705&i=1>>

wrote:

By using "quartz://src/data" it looks like you want route messages

from

the
src/data folder. But in this case "src" is the timer group name and

"data"

is the timer name.
And the quartz component sends an empty message (with a null body).

That's

what the file component complians. If you add something like:
<setBody><constant>Camel rocks</constant></setBody>

before your file endpoint, it should work...

Best,
Christian

On Fri, Mar 22, 2013 at 9:50 PM, bru1900 <[hidden email]<

http://user/SendEmail.jtp?type=node&node=5729701&i=0>>

wrote:

I did look at these documents, in one of the examples, the suggested

was

from("quartz://myGroup/myTimerName?cron=0+0/5+12-18+?+*+MON-FRI").

i am trying to do a similar thing in xml configuration. Where am i

going

wrong?



On Fri, Mar 22, 2013 at 4:47 PM, Christian Mueller [via Camel] <
[hidden email] <http://user/SendEmail.jtp?type=node&node=5729701&i=1>>

wrote:

Your Quartz URI is not valid. You can read more about it at [1].
I think you are looking for the cron scheduled route policy [2].

[1] http://camel.apache.org/quartz.html
[2] http://camel.apache.org/cronscheduledroutepolicy.html

Best,
Christian

On Fri, Mar 22, 2013 at 8:45 PM, bru1900 <[hidden email]<

http://user/SendEmail.jtp?type=node&node=5729698&i=0>>

wrote:

I am newly learning how to set up routes in camel, and Quartz

schedule

them.

I wrote a simple xml config,
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans";
        xmlns:camel="http://camel.apache.org/schema/spring";
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
        xsi:schemaLocation="

http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://camel.apache.org/schema/spring
http://camel.apache.org/schema/spring/camel-spring.xsd";>

   <camelContext trace="false" xmlns="

http://camel.apache.org/schema/spring

">
     <route id="simple">

                  <from

uri="quartz://src/data?cron=0+16+*+*+*+?"/>

              <log message="Moving message to Folder"/>
         <to uri="file:C:\Data\FuseJars\messages"/>
     </route>
</camelContext>

</beans>

The simple file transfer works, but when i added the scheduling

part

am

getting the following error.
Any help will be highly appreciated.

[artzScheduler-camel-1_Worker-5] QuartzEndpoint

ERROR

Error

processing exchange. Exchange[Message: [Body is null]]. Caused

by:

[org.quartz.JobExecutionException -

org.apache.camel.component.file.GenericFileOperationFailedException:

Cannot

write null body to file:

C:\Data\FuseJars\messages\ID-CGL-R8Y2AEZ-64638-1363878882438-0-29]

[artzScheduler-camel-1_Worker-5] JobRunShell

  INFO

Job

DEFAULT.quartz-endpoint1 threw a JobExecutionException:
org.quartz.JobExecutionException:

org.apache.camel.component.file.GenericFileOperationFailedException:

Cannot

write null body to file:

C:\Data\FuseJars\messages\ID-CGL-R8Y2AEZ-64638-1363878882438-0-29

[See

nested exception:

org.apache.camel.component.file.GenericFileOperationFailedException:

Cannot

write null body to file:

C:\Data\FuseJars\messages\ID-CGL-R8Y2AEZ-64638-1363878882438-0-29]

at

org.apache.camel.component.quartz.QuartzEndpoint.onJobExecute(QuartzEndpoint.java:117)[camel-quartz-2.10.0.fuse-71-047.jar:2.10.0.fuse-71-047]

at

org.apache.camel.component.quartz.CamelJob.execute(CamelJob.java:54)[camel-quartz-2.10.0.fuse-71-047.jar:2.10.0.fuse-71-047]

at

org.quartz.core.JobRunShell.run(JobRunShell.java:216)[quartz-1.8.5.jar:]

at

org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)[quartz-1.8.5.jar:]

[artzScheduler-camel-1_Worker-6] simple

INFO

  Moving
message to Folder
[



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camelContext.xml (1K) <
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Re: Cannot write null body to file error !

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