Bugs item #886544, was opened at 2004-01-28 16:42
Message generated for change (Comment added) made by jhaynie
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Category: JBossMX
Group: v3.2
Status: Closed
Resolution: Invalid
Priority: 5
Submitted By: Jeff Haynie (jhaynie)
Assigned to: Scott M Stark (starksm)
Summary: serialized ObjectName canonical value not equal
Initial Comment:
If you serialize an ObjectName and de-serialize it, the
canonical name (and toString()) are not equal - although
the object equality is true.
Example to program illustrate problem:
public class foo
{
public static void main (String args[])
{
try
{
ObjectName obj=new ObjectName
("vocalos:type=Service,foo=bar,bar=foo");
System.out.println(obj);
ByteArrayOutputStream bos=new
ByteArrayOutputStream();
ObjectOutputStream oos=new
ObjectOutputStream(bos);
oos.writeObject(obj);
ByteArrayInputStream bis=new
ByteArrayInputStream(bos.toByteArray());
ObjectInputStream ois=new ObjectInputStream
(bis);
ObjectName obj2 = (ObjectName)ois.readObject
();
// obj1 != obj2 (from a string value sense)
System.out.println(obj2);
System.out.println(obj.equals(obj2));
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
}
----------------------------------------------------------------------
>Comment By: Jeff Haynie (jhaynie)
Date: 2004-01-28 21:15
Message:
Logged In: YES
user_id=4529
>From a practical standpoint.
If you do a toString() on an object you expect that after
serialization toString() returns the same value, as should
hashCode() and equals().
There is no harm in fixing this such that this is the case
since the fix will service both purposes - it will return
the same value and continue to work as-is from a canonical
representation.
----------------------------------------------------------------------
Comment By: Scott M Stark (starksm)
Date: 2004-01-28 18:26
Message:
Logged In: YES
user_id=175228
There are N! ways to write the toString() representation of
an ObjectName with N properties and only one ordered
representation, that given by ObjectName.getCanonicalName().
getCanonicalName() is used in the implementation of equals
which is why the given example works from the
obj.equals(obj2) perspective.
obj.toString().equals(obj2.toString()) has no guarentee of
equality while
obj.getCanonicalName().equals(obj2.getCanonicalName()) does.
Further, the jmx 1.2 javadocs for toString state:
<p>Returns a string representation of the object name. The
format of this string is not specified, but users can expect
that two ObjectNames return the same string if and only if they
are equal.
</p>
This does not imply that two ObjectNames which are equal
must return the same toString value.
----------------------------------------------------------------------
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