Ruletemplate declaration in kmodule.xml

[Alex Vincent]

Hi,

I'm trying to use rule templates with Drools 6.4 Beta by specifying it in my kmodule.xml.

However when I start the engine the template does not seem to get loaded and the rules don't seem to get generated.

I don't get any error and I also noticed that no matter what values I specify in dtable and template attributes in my kmodule.xml the engine will not complain. I tried to set the log level to trace but it does not seem to give any information as to whether those files are loaded.

I have some other rules on my classpath that work fine. 

kmodule.xml:

<?xml version="1.0" encoding="UTF-8"?>

<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">

    <kbase name="KBase1" packages="process, rules">

    <ruleTemplate dtable="/C:/Users/alex/Documents/Git/DroolsParser/src/main/resources/decision tables/DuplicateFacts.xls"

                  template="/C:/Users/alex/Documents/Git/DroolsParser/src/main/resources/rule templates/tpl_duplicate_facts.drt"

                  row="2" col="2"/>

        <ksession name="KSession1"/>

    </kbase>

</kmodule>

Java code to create the session:

KieServices ks = KieServices.Factory.get()

KieContainer kContainer = ks.getKieClasspathContainer()

kSession = kContainer.newKieSession("KSession1")

Is there any way to make it work? Otherwise how can I generate my rules based on a rule template and a decision table using the API? I found some examples but with the old deprecated API (i.e. KnowledgeBase...)

Thanks a lot

Alex

[Michael Anstis]

There are numerous unit tests for kmodule based templates and decision tables (sorry I forget which module they're in - and I'm out on my phone)... so they definitely *can* be used.

The paths in your kmodule look a bit duff (for Windows). Try removing the leading slash.

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[Michael Anstis]

SimpleRuleTemplateExample in drools/drools-examples shows use of templates. There's a similar test in the decisiontables package.

[Jeff Jensen]

There are a few potential issues with your kmodule config.  To start, try these changes:

* spaces in your dir names: Java and Drools may or may not handle that correctly depending on code used to load the file in that path; may need to remove them or use %20 (URL encoding)

* change the file paths from fully qualified to classpath packages, such as:

dtable="decision tables/DuplicateFacts.xls"

template="rule templates/tpl_duplicate_facts.drt"

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[Alex Vincent]

Thanks Michael.

I will adjust my code based on that and let you know.

It would be nice if we can get a warning message if the template file or the decision table file could not be found. Also what are the row and col attributes? Do I have to modify the row value whenever I add new data to my decision table?

[Alex Vincent]

Thanks Jeff.

I'll try your suggestions.

[Michael Anstis]

I agree some form of error would be better than none - can you please create a new DROOLS JIRA? As far as I understand the row and column attributes point to the column and first row containing your data; so provided you append additional rows you should not need to change those values.

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[Alex Vincent]

Works better now. I also forgot to add the directories to the packages attribute of the kbase element. This works for me:

<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">

    <kbase name="KBase1" packages="process, rules, decisiontables, ruletemplates">

    <ruleTemplate dtable="decisiontables/dt_duplicate_facts.xls"

                  template="ruletemplates/tpl_duplicate_facts.drt"

                  row="2" col="2"/>

        <ksession name="KSession1"/>

    </kbase>

</kmodule>

I will create the JIRA ticket to request the improvement.