Groovy objects trying to override final methods

Using a java framework that defines a class like this

public class FrameworkComponent {
// lots of fields
// lots of methods
public final Object getProperty(String name)

// lots of other fields
// lots of other methods
}

If one tries to create a Groovy class that extends this
FrameworkComponent like the following:

class MyComponent extends FrameworkComponent {
def size = 10
}

the groovy compiler raises an error saying that MyComponent
overrides final method getProperty(String name) from
FrameworkComponent.

Attached to this issue follows bug.zip containing a mockup of this
framework and a Groovy class that extends the framework class.

To reproduce the error just unzip the file, navigate to the unzipped folder
and fire:

groovyc -cp framework.jar MyComponent.groovy

it will raise the following error lines

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed, MyComponent.groovy: -1: You are not allowed to overwrite the final method getProperty(java.lang.String) from class 'FrameworkComponent'.
@ line -1, column -1.
1 error