Dzmitry Kazimirchyk created CAY-2064:
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Summary: Issue with BeanAccessor for classes with complex
inheritance
Key: CAY-2064
URL: https://issues.apache.org/jira/browse/CAY-2064
Project: Cayenne
Issue Type: Bug
Affects Versions: 4.0.M3
Reporter: Dzmitry Kazimirchyk
As reported on github per [https://github.com/apache/cayenne/pull/87]:
In certain cases, simply adding an interface to a class with no other changes
can break PropertyUtils.setProperty.
For example, consider a HasName interface and a Person entity with a name
attribute:
{code:java}
public interface HasName {
CharSequence getName();
}
public class _Person extends CayenneDataObject {
public void setName(String name) {
writeProperty(NAME_KEY, name);
}
public String getName() {
return (String) readProperty(NAME_KEY);
}
}
public class Person extends _Person implements HasName {
}
{code}
My only change from the generated classes is to make Person implement HasName.
Now, when I call PropertyUtils.setProperty(person, Person.NAME_KEY, newName), I
get a PropertyException: Property "name" is not writable.
What's happening is that the compiler is generating a synthetic, no-arg method
in Person.class named "getName" that returns a CharSequence. Since that's the
only no-arg method named "getName" in the class, that's the method returned by
Class.getMethod. (It finds a method in the class and so never checks the super
class, per the documentation.) When BeanAccessor looks for the write method, it
looks for setName(CharSequence) instead of setName(String) and comes up empty.
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