There's also a quirk regarding the class resolution:-

Given Person class:-

package com.guvnor.domain;

import java.math.BigDecimal;

public class Person {

    private BigDecimal salary;

    public BigDecimal getSalary() {
        return salary;
    }

    public void setSalary(BigDecimal salary) {
        this.salary = salary;
    }

}


The following compiles OK:-

package com.sample
 
import com.guvnor.domain.Person

declare Person
end

However the following does not (without explicitly importing java.math.BigDecimal - which is a field type in Person):-

package com.sample
 
import com.guvnor.domain.Person
import com.guvnor.domain.Address

declare Person
end

declare Person2 extends Person
    flange : String
end

Error being "Unknown DroolsError class org.drools.compiler.TypeDeclarationError: Unable to find class 'BigDecimal' ".

With kind regards,

Mike

On 11 July 2011 08:41, Wolfgang Laun <wolfgang.laun@gmail.com> wrote:

Subsection 5.7.7 discusses 'extends' and describes how it is done for types declared in Java.

One finesse is apparently not documented: Java types must be proper JavaBeans; otherwise the construction of the accessors will fail. (Try, for instance, a property with a getter but no matching setter.)

HTH
-W

On 10 July 2011 22:29, Michael Anstis <michael.anstis@gmail.com> wrote:

What's the rules around declared types extending another (declared) type?

I've been asked to provide for declared type extension in Guvnor (by Prakash) but the Expert user-guide doesn't say it exists at the engine level.

I tried "declare MyType extends java.util.ArrayList" and received a parser\compiler error stating "java.util.ArrayList was not a declared type" (or words to that effect) so some form of extension appears possible.

Thanks,

Mike

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