Re: Exception when using JavaScript expression in Camel routes

Fri, 02 Sep 2011 05:55:06 -0700 

Hi,
Absolutely camel-script should work without sevicemix-scripting feature get installed, create CAMEL-4407[1], will fix it there. 

Thanks for pointing out this issue.
[1]https://issues.apache.org/jira/browse/CAMEL-4407

Freeman
On 2011-9-2, at 下午7:59, metatech wrote:


Hi Freeman,

I found the cause of my exception :

My ServiceMix installation was not really "vanilla" : I anticipated
the future "light" packaging (SMX4-883) and removed all "servicemix-*"
features, including "servicemix-scripting", because I use only OSGI
components and no JBI components (they are planned to be removed in
ServiceMix 5.x anyway).

After reinstalling the JavaScript engine with the following commands,
it worked !


osgi:install mvn:org.apache.servicemix.bundles/ 
org.apache.servicemix.bundles.rhino/1.7R1_3
osgi:install mvn:com.google.code.scriptengines/scriptengines- 
javascript/1.1

osgi:start 147
osgi:start 148

By debugging step-by-step, I see that the implementation used is

"com 
.google.code.scriptengines.js.javascript.RhinoScriptEngineFactory".


I find it strange however that the "camel-script" relies on the
presence of the "servicemix-scripting" to work properly. Is it really
intended to work this way ? Maybe the enhancements in Camel 2.8 will
make this prerequisite unnecessary anymore.
It is nevertheless worth checking that it works with Service 4.4 (or
4.5) without JBI.


Next time I will certainly try to reproduce on a "full vanilla  
installation" :-)


Thanks again for your help !

metatech


On 2 September 2011 12:38, Freeman-2 [via ServiceMix]
<[email protected]> wrote:

Hi,


I'm testing it with Apache Servicemix 4.3, exactly same version as  
you

use.
When I try to access URL  :http://localhost:8888/javascriptClassCast

 From the $SMX_HOME/etc/servicemix.log I see  log like

18:25:24,880 | INFO  | Thread-37        |
Tracer                           | 68 - org.apache.camel.camel-core -
2.6.0 | ID-Freeman-Mac-55497-1314959007814-0-6 >>> (route1)
from(http://0.0.0.0:8888/javascriptClassCast
) --> choice <<< Pattern:InOut, Headers:
{org.restlet.startTime=1314959124878, org.restlet.http.version=HTTP/
1.1, org.restlet.http.headers=[Host: localhost:8888, User-Agent:
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2.21)
Gecko/20110830 Firefox/3.6.21, Accept: text/html,application/xhtml

+xml,application/xml;q=0.9,*/*;q=0.8, Accept-Language: en- 
us,en;q=0.5,

Accept-Encoding: gzip,deflate, Accept-Charset:
ISO-8859-1,utf-8;q=0.7,*;q=0.7, Keep-Alive: 115, Connection: keep-
alive], CamelHttpMethod=GET,
CamelHttpUri=http://localhost:8888/javascriptClassCast
}, BodyType:null, Body:null
18:25:24,887 | INFO  | Thread-37        |
Tracer                           | 68 - org.apache.camel.camel-core -

2.6.0 | ID-Freeman-Mac-55497-1314959007814-0-6 >>> (route1) choice  
-->

log://output <<< Pattern:InOut, Headers:
{org.restlet.startTime=1314959124878, org.restlet.http.version=HTTP/
1.1, org.restlet.http.headers=[Host: localhost:8888, User-Agent:
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2.21)
Gecko/20110830 Firefox/3.6.21, Accept: text/html,application/xhtml

+xml,application/xml;q=0.9,*/*;q=0.8, Accept-Language: en- 
us,en;q=0.5,

Accept-Encoding: gzip,deflate, Accept-Charset:
ISO-8859-1,utf-8;q=0.7,*;q=0.7, Keep-Alive: 115, Connection: keep-
alive], CamelHttpMethod=GET,
CamelHttpUri=http://localhost:8888/javascriptClassCast
}, BodyType:null, Body:null
18:25:24,888 | INFO  | Thread-37        |
output                           | 68 - org.apache.camel.camel-core -
2.6.0 | Exchange[ExchangePattern:InOut, BodyType:null, Body:null]
18:25:24,889 | INFO  | Thread-37        |
LogService                       |  -  -  | 2011-09-02 18:25:24
0:0:0:0:0:0:0:1%0 8888 GET /javascriptClassCast - 200 - - 10
http://localhost:8888

        Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv: 
1.9.2.21)


Gecko/20110830 Firefox/3.6.21 -



So I assume for this simple camel router it should also work in  
SMX4.3.


Of course you can expect SMX 4.4(which will be release soon) which

will use Camel 2.8.x for better camel-script support in OSGi  
container.


Btw, you may need check if you install camel-restlet and camel-script
feature successfully.

Freeman
On 2011-9-2, at 下午3:24, metatech wrote:


Hi Freeman,

I DID install camel-restlet and camel-script.


The bundle is deployed successfully, but I see the exception in my  
web

browser when I try to access its URL  :
http://localhost:8888/javascriptClassCast

I also tried to add the file

/META-INF/services/javax.script.ScriptEngineFactory in my bundle,  
but

Camel fails in a different code path : ClassCastException in
ScriptEngineManager:131:
ScriptEngineFactory f = factoryClass.newInstance();

Following to Claus' answer, I found the following bug :
https://issues.apache.org/jira/browse/CAMEL-3481

When I uninstall camel-script, I see a different exception during
deployment (see below).
I have a "vanilla" ServiceMix 4.3, which contains Camel 2.6
components.
Which version do you have ?

Thanks,

metatech
=============
Caused by: org.apache.camel.FailedToCreateRouteException: Failed to
create route route3 at: >>>

Choice[[When[js{request.headers.get('CamelHttpQuery') == '_wadl2'}  
->

[To[log:output]]]] Otherwise[[To[log:output]]]] <<< in route:
Route[[From[restlet:http://0.0.0.0:8888/javascriptClassCast?...
because of No language could be found for: js
at
org
.apache.camel.model.RouteDefinition.addRoutes(RouteDefinition.java:
759)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache.camel.model.RouteDefinition.addRoutes(RouteDefinition.java:
160)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel.impl.DefaultCamelContext.startRoute(DefaultCamelContext.java:
701)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel
.impl
.DefaultCamelContext.startRouteDefinitions(DefaultCamelContext.java:
1623)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel

.impl.DefaultCamelContext.doStartCamel(DefaultCamelContext.java: 
1412)

[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:
1321)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache

.camel.spring.SpringCamelContext.doStart(SpringCamelContext.java: 
164)

[79:org.apache.camel.camel-spring:2.6.0]
at org.apache.camel.impl.ServiceSupport.start(ServiceSupport.java:
65)[72:org.apache.camel.camel-core:2.6.0]
at org.apache.camel.impl.ServiceSupport.start(ServiceSupport.java:
52)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:1299)
[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel.spring.SpringCamelContext.maybeStart(SpringCamelContext.java:
203)[79:org.apache.camel.camel-spring:2.6.0]
at
org
.apache
.camel
.spring
.SpringCamelContext.onApplicationEvent(SpringCamelContext.java:101)
[79:org.apache.camel.camel-spring:2.6.0]
... 10 more

Caused by: org.apache.camel.NoSuchLanguageException: No language  
could

be found for: js
at
org
.apache
.camel
.core

.osgi 
.OsgiLanguageResolver.resolveLanguage(OsgiLanguageResolver.java:

62)[79:org.apache.camel.camel-spring:2.6.0]
at
org
.apache
.camel
.impl.DefaultCamelContext.resolveLanguage(DefaultCamelContext.java:
922)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel
.model
.language
.ExpressionDefinition.createPredicate(ExpressionDefinition.java:152)
[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel
.model
.language
.ExpressionDefinition.createPredicate(ExpressionDefinition.java:141)
[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel
.model.ExpressionNode.createFilterProcessor(ExpressionNode.java:97)
[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel.model.WhenDefinition.createProcessor(WhenDefinition.java:69)
[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel.model.ChoiceDefinition.createProcessor(ChoiceDefinition.java:
69)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel
.model.ProcessorDefinition.makeProcessor(ProcessorDefinition.java:
403)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache
.camel.model.ProcessorDefinition.addRoutes(ProcessorDefinition.java:
174)[72:org.apache.camel.camel-core:2.6.0]
at
org
.apache.camel.model.RouteDefinition.addRoutes(RouteDefinition.java:
756)[72:org.apache.camel.camel-core:2.6.0]
... 21 more


On 2 September 2011 02:53, Freeman-2 [via ServiceMix]
<[hidden email]> wrote:

Hi,

After install install camel-restlet and camel-script, I can deploy
this test bundle successfully with Apache Servicemix 4.3.
But without the camel-script feature, I can see exactly same
exception
you encounter.
You need ensure your machine have internet connection and ensure
there's no exception when you install camel features.

Freeman
On 2011-9-1, at 下午11:25, metatech wrote:


Freeman,

I did install camel-restlet and camel-script.
You can see classes from both bundles in my stack trace.
Does the sample projet work for you on SMX 4.3 ?

Thanks,

metatech

On 1 September 2011 17:19, Freeman-2 [via ServiceMix]
<[hidden email]> wrote:

Hi,


Ensure you already install camel-restlet and camel-script  
feature,

then you can deploy your bundle in SMX4.3.

Freeman
On 2011-9-1, at 下午11:03, metatech wrote:


Freeman,

Here is a sample project.
It is really a basic OSGI-based project with only 2 files :
pom.xml
and camel-config.xml
Can I make it work with ServiceMix 4.3 or do have I have to wait
for
the release of 4.4 ?

Thanks,
Regards,

metatech


On 1 September 2011 14:54, Freeman-2 [via ServiceMix]
<[hidden email]> wrote:

Hi,

This generally means
com.sun.script.javascript.RhinoScriptEngineFactory and
ScriptEngineFactory are loaded by different classloader.

You need elaborate how you package your customer bundle,   
such as

how
is the OSGi metadata header looks like? you're using JBI
package or
OSGi package? Did you embed jar into your bundle? A test
project(with
pom.xml which we can build and deploy)  would be more helpful
here.

Freeman
On 2011-9-1, at 下午8:39, metatech wrote:


Hello,


With ServiceMix 4.3, I am trying to use a JavaScript  
expression

in a
Camel
route as described here :
http://camel.apache.org/javascript.html
<choice>
<when>
<javaScript>request.headers.get('myheader') == 'myvalue'</
javaScript>
<to uri="log:output"/>
</when>
</choice>


The routed worked fine with a "Simple" expression, but  
raises an

exception
when using the JavaScript expression, at the moment that a
message
is sent
through the route :
java.lang.IllegalArgumentException: No script engine could be
created for:
js
at



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---------------------------------------------
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FuseSource
Email:[hidden email]
Web: fusesource.com
Twitter: freemanfang
Blog: http://freemanfang.blogspot.com











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FuseSource
Email:[email protected]
Web: fusesource.com
Twitter: freemanfang
Blog: http://freemanfang.blogspot.com































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