[rules-users] Understanding "no viable alternative ..." errors

[Pritam]

Ah, that was an oversight. After fixing that, I now get ...

mismatched input '"type"' expecting ']' in rule "filter content if
advertisement" in pattern properties

Is something wrong with this mvel syntax?
properties["type"]=="ad" from content


Pritam wrote:
> 
> While executing the following rule,
> 
> dialect "mvel"  
> import xxx.*
> import java.util.*
> global HashMap filter
> 
> rule "filter content if advertisement"
> 	when 
> 	    point: Point(page == "home", region ="center-content")
> 	    content: Content(id=="adslot")
> 	    properties["type"]=="ad" from content
> 	then     
> 	    filter.put(content.id, true); 
> end
> 
> I get the following error:
> [ERR 101] Line 16:46 no viable alternative at input 'EQUALS' in rule
> "filter content if advertisement" in pattern Point[18,16]: [ERR 102] Line
> 18:16 mismatched input '"type"' expecting ']' in rule "filter content if
> advertisement" in pattern properties
> 
> The documentation explains that this is the most common error but I still
> struggle to understand the correct grammar for writing rules. Can anyone
> point me to a good resource (I even read the book "Drools 5" by Packt) for
> writing the following rule in a drl format?
> 
> " If a Point has a page, "home" and region, "center-content" and the
> Content id is "adslot" with a property, type as "ad" then filter the
> Content (using a global map and passing a boolean flag)
> 
> Thanks
> 

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