Hi all,

I am writing rules using Drools Templates and I noticed strange problems (ocurring when I slightly modify a DRT that works well):

1. the template instanciation depends on the declarations order of the parameters in the template header
2. if the rule template does not contain a package declaration (default package) the instanciation of the template fails

I am working with Drools 5.1.1 but those problems occur in 5.2.0.Final and in 5.3.0.Final as well.
Do you think it is worth posting a JIRA?

Anyway let me tell you that Drools Templates are great! Our users like that feature a lot! They start writing a rule in DRL format and, once it works, they transform it into a DRT and put data into a tsv file. It is quite a natural way of working. The general perception here is that it is easier to "templatize" an existing DRL than to write a decision table from scratch.

Best regards,

Bruno.

PS:

DRT that works well:

template header
name
message

package templates;

import org.drools.bug.Entity;

template "TestTemplate"
rule "Test1 @{row.rowNumber}"
    dialect "mvel"
    when
        Entity( $name : name == "@{name}" )
    then
        System.out.println("@{message}" + $name);
        insert($name);
end
end template

DRT that does not work (first case):

template header
message
name

package templates;

import org.drools.bug.Entity;

template "TestTemplate"
rule "Test1 @{row.rowNumber}"
    dialect "mvel"
    when
        Entity( $name : name == "@{name}" )
    then
        System.out.println("@{message}" + $name);
        insert($name);
end
end template


DRT that does not work (second case):

template header
name
message

import org.drools.bug.Entity;

template "TestTemplate"
rule "Test1 @{row.rowNumber}"
    dialect "mvel"
    when
        Entity( $name : name == "@{name}" )
    then
        System.out.println("@{message}" + $name);
        insert($name);
end
end template