Hi there,

 

Error message:

(null: 5, 77): schema_reference.4: Failed to read schema document 'drools.org/drools-5.0.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

 

I ran into this issue when experimenting a project that transforming the rules back and forth from DRL to XML with utility classes as documented in following link:

 

http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/html/ch04.html#d0e5750

 

My code:

…

XmlPackageReader xmlReader = new XmlPackageReader(null);

StringReader sr = new StringReader(rulesInXml);

try {

                PackageDescr  packageDescr = xmlReader.read(sr);

DrlDumper drlDumper = new DrlDumper();

String drlString = drlDumper.dump(packageDescr);

}

catch (Exception ex) {

                System.out.println(ex);

}

…

 

where string “rulesInXml” is the result xml string transformed from a valid .drl file. It looks like:

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

<package name="com.sample" 

      xmlns="http://drools.org/drools-5.0"

      xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"

      xs:schemaLocation="http://drools.org/drools-5.0 drools.org/drools-5.0.xsd">

<import name="com.sample.DroolsTest.Message" />

 

<rule name="Hello World">

<lhs><pattern identifier="m" object-type="Message" >

<field-constraint field-name="status">

<qualified-identifier-restriction evaluator="==">Message.HELLO </qualified-identifier-restriction>

</field-constraint>

<field-binding field-name="message" identifier="myMessage" />

</pattern>

</lhs>

 

<rhs>       System.out.println( myMessage );

            m.setMessage( "Goodbye cruel world" );

            m.setStatus( Message.GOODBYE );

            update( m );

</rhs>

</rule>

 

<rule name="GoodBye">

<lhs><pattern object-type="Message" >

<field-constraint field-name="status">

<qualified-identifier-restriction evaluator="==">Message.GOODBYE </qualified-identifier-restriction>

 

</field-constraint>

<field-binding field-name="message" identifier="myMessage" />

</pattern>

</lhs>

 

<rhs>       System.out.println( myMessage );

</rhs>

</rule>

</package>

 

What did I miss here?

 

Moreover, the Drools 5.0 API’s for XML support are poorly-documented. For example, the constructors of class “XmlPackageReader” has an arg of “SemanticModules” type which is not documented. L

 

Any help would be highly appreciated!

 

Thanks,

Chang