[jboss-jira] [JBoss JIRA] Created: (JBSER-120) Can't add field to class as the Java Serialization says is compatible
Can't add field to class as the Java Serialization says is compatible
---------------------------------------------------------------------
Key: JBSER-120
URL: https://jira.jboss.org/jira/browse/JBSER-120
Project: JBoss Serialization
Issue Type: Bug
Affects Versions: 1.0.3 GA
Environment: WIndows 2003 server 64-bit
Reporter: Tom Saulpaugh
Assignee: Clebert Suconic
Fix For: 1.1.0 Beta
I traced through this in jboss-serialization and it appears to be a basic coding bug.
Look at this code in StreamingClass.readStream(), which includes the exception being
thrown:
short numberofFields=inp.readShort();
keyfields[slotIndex] = new short[numberofFields];
ClassMetadataField fields[] = slots[slotIndex].getFields();
if (numberofFields>fields.length)
{
throw new IOException("Current classpath has lesser fields on "
+ className + " than its original version");
}
for (short fieldIndex=0;fieldIndex<fields.length;fieldIndex++)
{
long hashfield = inp.readLong();
ClassMetadataField fieldOnHash = slots[slotIndex].getField(hashfield);
if (fieldOnHash==null)
{
throw new IOException ("Field hash " + fieldOnHash + "
is not available on current classPath for class " + className);
}
keyfields[slotIndex][fieldIndex] = fieldOnHash.getOrder();
}
Note that there are numberOfFields fields on the serialized prior version of the object,
while there are fields.length fields in the new version of the class being deserialized
to. The code reads the serialized fields and looks up the correspondent fields on the new
class by hash.
However, note that it reads fields.length fields from the file instead of numberofFields
fields!!!
That is the problem. It reads a long from the file that is not even a hash code of a
field and so can't find it in the hash array, whence the null.
This really does mean that the latest version of JBoss serialization has a bug that causes
it to fail to handle field additions on new versions of classes.
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
https://jira.jboss.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira