[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2901) Repeating method declaration in interface hierarchy causes faulty method lookup in proxies

[Wouter Lievens (JIRA)]

Repeating method declaration in interface hierarchy causes faulty method lookup in proxies
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                 Key: HHH-2901
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2901
             Project: Hibernate3
          Issue Type: Bug
    Affects Versions: 3.2.5
         Environment: Hibernate 3.2.5
DBMS: MySQL (probably irrelevant)
            Reporter: Wouter Lievens


Consider the following two interfaces

interface A
{
  public abstract void b();
}

interface B extends A
{
  public abstract void b();
}

Note that B repeats the definition of "b", which is perfectly legal java code.

Now consider these two classes:

abstract class AImpl implements A
{
}

public class BImpl extends AImpl implements B
{
    public final void b()
    {
        // implementation is irrelevant
    }
}

Now consider that mappings have been created where interfaces A and B are given as the "proxy" type for mapped entity types AImpl and BImpl, respectively, and that the BImpl mapping "extends" the AImpl mapping.

Now, when an object is loaded by refering to the base type (AImpl), then invocations of the method "b" will raise the following exception:

java.lang.IllegalArgumentException: object is not an instance of declaring class

A short time spent debugging suggested to me that the method that the proxy (a proxy for A, not B!) selected to delegate the call to the "wrong" method somehow, causing this error. The problem can be remedied by removing the declaration for "b" in the B interface.

So, there is a workaround: don't repeat declarations. But still I would prefer to see this issue solved.

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