java - Drools function access

Question

I have a .drl file which serves as a common file for functions for my various rule files.

This .drl file which holds my common functions is in package com.sample.common. (file: a_common.drl)

I have a rule file which is also in package com.sample.common and the rules execute just fine. (file: rule1.drl)

I have a rule file which is in package com.sample.common.anotherpackage and the rules fail due to the function call not being available. (file: rule2.drl)

If I have read the various posts on this subject correctly, there is no easy way to make both of my rule files ( rule1.drl & rule2.drl ) access the common rule file a_common.drl unless I change the package name of rule2.drl to com.sample.common...

I am aware that I could do something by adjusting Java code outside of the .drl files; however, in my case I need to stick to working with functions in .drl files.

File: a_common.drl

package com.sample.common

function boolean getFirstX(String string, int x){
    ...somecode
    return (string != null);
}

function boolean getNextX(String string, int x){
    ...somecode
    return (string != null);
}

File: rule1.drl ( function getFirstX works fine )

package com.sample.common

rule "Hello World"
    
    when
        
        eval( getFirstX("somevalue") )
        
    then
       ....do something

end

File: rule2.drl ( function getFirstX is not found )

package com.sample.common.anotherpackage

rule "Hello World"
    
    when
        
        eval( getFirstX("somevalue") )
        
    then
       ....do something

end

question from:https://stackoverflow.com/questions/65924085/drools-function-access

Answer 1

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