Rule Parsing error while adding cutom object information in

[vsahni]

Hi All,
I am trying to add a custom object such as ErrorList to a JBOSS-ESB message so that as the rules are excuted by rule engine I can update the message with some information such as errors. On following the steps listed below and deploying a rule parser error is thrown.


1) Action Processor:
ErrorList errorList = new ErrorList();

where ErrorList is a class containing ArrayList and a property to add a value to errorlist.
1) Setup Action Processor:
ErrorList errorList = new ErrorList();
message.getBody().add("TheErrorList",errorList);
2) Updating Message in .drl file as below:
rule "TEST"
when
errors : ErrorList()
then
errors.setError("ERROR1");
Log : test log";
end
3) jboss-xml definition where .drl file gets loaded:

<object-path esb="body.TheErrorList" />



Error:
:50:57,130 INFO [STDOUT] Message Property org.jboss.soa.esb.actions.current.a
er: [B@bf0023
:50:57,146 WARN [ActionProcessingPipeline] Unexpected exception caught while
ocessing the action pipeline
g.jboss.soa.esb.actions.ActionProcessingException: Could not parse the rules.
g.drools.lang.ExpanderException@116832f
at org.jboss.soa.esb.actions.ContentBasedWiretap.process(ContentBasedWir
ap.java:103)
at org.jboss.soa.esb.actions.ContentBasedRouter.process(ContentBasedRout
.java:50)
at org.jboss.soa.esb.listeners.message.ActionProcessingPipeline.process(
tionProcessingPipeline.java:265)
at org.jboss.soa.esb.listeners.message.MessageAwareListener$1.run(Messag
wareListener.java:297)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExec
or.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
ava:675)
at java.lang.Thread.run(Thread.java:595)
used by: org.jboss.soa.esb.services.routing.MessageRouterException: Could not
rse the rules. org.drools.lang.ExpanderException@116832f
at org.jboss.internal.soa.esb.services.routing.cbr.JBossRulesRouter.rout
JBossRulesRouter.java:155)
at org.jboss.soa.esb.actions.ContentBasedWiretap.routeMessage(ContentBas
Wiretap.java:132)
at org.jboss.soa.esb.actions.ContentBasedWiretap.process(ContentBasedWir
ap.java:98)
... 6 more
used by: org.jboss.soa.esb.services.routing.cbr.CBRException: org.drools.lang.
panderException@116832f
at org.jboss.internal.soa.esb.services.routing.cbr.JBossRulesRouter.read
leBase(JBossRulesRouter.java:208)
at org.jboss.internal.soa.esb.services.routing.cbr.JBossRulesRouter.rout
JBossRulesRouter.java:126)
... 8 more
used by: org.drools.rule.InvalidRulePackage: org.drools.lang.ExpanderException
16832f
at org.drools.rule.Package.checkValidity(Package.java:419)
at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:2
)
at org.jboss.internal.soa.esb.services.routing.cbr.JBossRulesRouter.read
leBase(JBossRulesRouter.java:205)
... 9 more
:50:57,161 WARN [MessageAwareListener] Error processing courier, backing off
r 1000 milliseconds

[kurtstam]

Did you also add an import statement for the ErrorList Object on the drl file?

[kurtstam]

BTW, can you move this topic to the user forum?

http://www.jboss.com/index.html?module=bb&op=viewforum&f=246

thx,

--Kurt

[marklittle]

Moved.

[vsahni]

Kurt,
Thanks for responding to my issue. Yes I did include the import statement.

However I am not sure if rule engine is picking up the definition correctly. To validate I tried both statements listed below see if engine detects ErrorList definition or not.

import com.oldlane.esb.util.ErrorList;
when
 e : junknnmnnErrorList()
or
when
 e : ErrorList()

In both cases it did not make a difference.

[vsahni]

Even a simple syntax such as the one below produces the ExpandException.

rule "Missing TradeId Ref "
when
m : Message ()
then
Log : "~~~~ Missing TradeId";
end

Thanks for your help.

[kurtstam]

Did you deploy this class so Drools can find it? It should be no different then the 'Order' object in most junit and quickstart examples.

[kurtstam]

Note that 'Log' is not standard Drools language, it is defined in the XPathLanguage.dsl.

Also I don't think there is an 'or' construct.

[jeffdelong]

Can you include the entire contents of the rule file?

[vsahni]

I am including both rule and dsl file. I am not sure where did you se'or' construct.

package com.jboss.soa.esb.routing.cbr;

import org.jboss.soa.esb.message.Message;
import org.jboss.soa.esb.message.format.MessageType;
import com.oldlane.esb.util.ErrorList;

#declare any global variables here
global java.util.List destinations;
expander OLXPathLanguage.dsl

rule "Missing TradeId Ref "
 when
 m : Message ()
 then
 Log("Missing Data");
end

OLXPathLanguage.dsl definition is:
#JBossESB Content Based Routing using XPath DSL
[when]xpathMatch "{xpath}"=msg : Message( type == MessageType.JBOSS_XML ) and eval( org.jboss.internal.soa.esb.services.routing.cbr.DslHelper.xmlContentMatches(msg, "{xpath}") )
[when]xpathEquals "{xpath}", "{value}"=msg : Message( type == MessageType.JBOSS_XML ) and eval( org.jboss.internal.soa.esb.services.routing.cbr.DslHelper.xmlContentEquals(msg, "{xpath}", "{value}") )
[when]xpathGreaterThan "{xpath}", "{value}"=msg : Message( type == MessageType.JBOSS_XML ) and eval( org.jboss.internal.soa.esb.services.routing.cbr.DslHelper.xmlContentGreaterThan(msg, "{xpath}", "{value}") )
[when]xpathLessThan "{xpath}", "{value}"=msg : Message( type == MessageType.JBOSS_XML ) and eval( org.jboss.internal.soa.esb.services.routing.cbr.DslHelper.xmlContentLessThan(msg, "{xpath}", "{value}") )
[when]xpathDateAfter "{xpath1}", "{xpath2}"=msg : Message( type == MessageType.JBOSS_XML ) and eval( com.oldlane.esb.util.OLDSLHelper.xmlDateAfter(msg, "{xpath1}", "{xpath2}") )
[when]xpathDateBefore "{xpath1}", "{xpath2}"=msg : Message( type == MessageType.JBOSS_XML ) and eval( com.oldlane.esb.util.OLDSLHelper.xmlDateBefore(msg, "{xpath1}", "{xpath2}") )
[when]xpathEmpty "{xpath}"=msg : Message( type == MessageType.JBOSS_XML ) and eval( com.oldlane.esb.util.OLDSLHelper.xmlContentEmpty(msg, "{xpath}") )
[when]xpathValidateAllotment "{xpath}"=msg : Message( type == MessageType.JBOSS_XML ) and eval( com.oldlane.esb.util.OLDSLHelper.validateAllotment(msg, "{xpath}") )
[then]Log : "{message}"=System.out.println("{message}");
[then]Destination : "{message}"=destinations.add("{message}");

[jeffdelong]

Could you also post the relevant portion of the jboss-esb.xml, i.e., the contents of the action element for the content based router.

[vsahni]

Please see the CORRECTED rule file!!! By the way if I comment m : Message() syntax below and uncomment the Xpath line then it works fine.

But the goal here is to use syntax such as
m : Message() or e : ErrorList() so that a custom object data can be updated in the message.

package com.jboss.soa.esb.routing.cbr;

import org.jboss.soa.esb.message.Message;
import org.jboss.soa.esb.message.format.MessageType;
import com.oldlane.esb.util.ErrorList;

#declare any global variables here
global java.util.List destinations;

expander OLXPathLanguage.dsl

rule "Missing TradeId Ref "
when
m : Message()
#xpathEmpty "/olcmf/olcmfMessage/messageData/dataRecord/tradeRecord/tradeIDs/tradeID"
then
Log : "~~~~ Missing TRADE ID";
end

[jeffdelong]

In these examples, you are not writing your rules in the the DSL, you are writing them in native DRL. But your rule file is "expanding" them with the OLXPathLanguage.dsl

You would need to add your additional rules mappings to the DSL. For example:

[when]There is an ErrorList=errors : ErrorList()
[then]Add error to ErrorList= errors.setError("ERROR1");

You would then write the rule

when
 There is an ErrorList
then
 Add error to ErrorList

The DSL also needs to be referenced in the action:

 <action class="org.jboss.soa.esb.actions.ContentBasedRouter" name="ContentBasedRouter">
 <property name="ruleSet" value="YourRules.drl"/>
 <property name="ruleLanguage" value="OLXPathLanguage.dsl"/>

[vsahni]

Sure here is the relevant portion of the esb xml.

<action name="tradeOrSecurityRouter"
 class="org.jboss.soa.esb.actions.ContentBasedRouter">
 <property name="ruleSet"
 value="filename.drl" />
 <property name="ruleReload" value="true" />
 <property name="ruleLanguage"
 value="OLXPathLanguage.dsl" />
 <property name="destinations">

 ---- route to some destinations here ......

 </property>
 <property name="object-paths">
 <object-path esb="body.TheErrorList" />
 </property>

[jeffdelong]

Also, I would be careful about using 'or' between facts. It will make it harder to write your DSL, but also can lead to issues in the consequence of the rule. If you say:

when
 m: Message() or e : ErrorList
then
 m.doSomething();
 e.doSomethingElse();

You will get an error when either Message or ErrorList does not exist.