Hi Felipe,

thank you for bearing with me.

actually I put an eval() there just to have something as simple as possible(but couldn't be sure it it worked). 

I actually found a hello world example which works fine without being template and which I will now try to transform it into template form. I suspect I'm not passing parameter correctly, somehow.

I will unfortunately be away for the next 10 days, so will revert only later and hopefully on a better example than my original.

Thanks. Stefan

2010/4/27 Felipe Piccolini <felipe.piccolini@gmail.com>
Im not sure if you can find a complete standalone example for this, but I think your problem now is with eval().

Can you copy your stackTrace here?

I think you can not do eval( literal == literal),
but you could make a function to test that if you wanna use eval and give the function the value of @{symbol}


2010/4/27 Stefan Marconi <stefan.marconi@gmail.com>

Hi Felipe,

thank you for your reply. I have now added the extra quotes but to no avail. I still get the same errors.

Is there somewhere a stand-alone example with the compile instructions to check that everything works? I have the impression that I'm having troubles with the whole eclipse config and plugin.

Thanks! Stefan


2010/4/26 Felipe Piccolini <felipe.piccolini@gmail.com>

Using template you will see that the @{} is replaced "just as is" from the data (for example from a spreadsheet), so
if you have a value in the example will be replaced as text in the rule and you will have something like this:

if @{symbol} == "THE_SYMBOL"

==>

rule "A stand alone rule THE_SYMBOL"
dialect "mvel"
when
eval(THE_SYMBOL == "AAA")
then 
System.out.println("this symbol is" + THE_SYMBOL)
end
----------

So as you can see, the variable is no more a variable in the generated rule, just text, so if you wanna use it as a string, you should add double-quote
(")

your rule template should be something like this:


rule "A stand alone rule @{symbol}"
dialect "mvel"
when
eval("@{symbol}" == "AAA")
then 
System.out.println("this symbol is" + "@{symbol}")
end




2010/4/22 Stefan Marconi <stefan.marconi@gmail.com>
Hi,

just starting using drools and need to use templates but having error messages (described in comments in the code below). 
I checked the meaning of the error messages but still can't figure it out.
I modified an simple rule according to the template section of the drools manual: btw I use the eclipse with the drools-core plugin.

Thanks for your help. Stefan

template header
symbol

package com.test.processor; # [ERR 102] Line 4:26 mismatched input ';' expecting 'identifier' in template header
template "test"
rule "A stand alone rule @{symbol}"
dialect "mvel"
when
eval(@{symbol} == "AAA")
then 
System.out.println("this symbol is" + @{symbol})
end
end template # Multiple markers at this line
# - [ERR 103] Line 13:0 rule 'rule_key' failed predicate: {(validateIdentifierKey(DroolsSoftKeywords.RULE))}? in rule
# - [ERR 101] Line 13:4 no viable alternative at input 'template' in rule end


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-----------------------------
Felipe Piccolini
felipe.piccolini@gmail.com

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-----------------------------
Felipe Piccolini
felipe.piccolini@gmail.com

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