Assistance Needed for XStream Conversion Issue with Policy Object - Invalid Reference Error.

[rani111agrawal]

am encountering an error while converting a Policy object into XML using XStream, and I require assistance to resolve it. The conversion process fails with an Invalid reference error. Below are the error details:

Error Stack Trace:

com.thoughtworks.xstream.converters.ConversionException: Invalid reference
---- Debugging information ----
message : Invalid reference
reference : ../../storedSnapshot/com.csc.pt.svc.data.relational.entity.ClientNameBasicContract
referenced-type : com.csc.pt.svc.data.relational.entity.ClientNameBasicContract
referenceable : true
class : java.util.HashSet
required-type : java.util.HashSet
converter-type : com.thoughtworks.xstream.converters.collections.CollectionConverter
path : /com.csc.pt.svc.data.relational.entity.Policy/clientNameBasicContract/set/com.csc.pt.svc.data.relational.entity.ClientNameBasicContract
line number : 1
class[1] : org.hibernate.collection.spi.PersistentSet
required-type[1] : org.hibernate.collection.spi.PersistentSet
converter-type[1] : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
class[2] : com.csc.pt.svc.data.relational.entity.Policy
required-type[2] : com.csc.pt.svc.data.relational.entity.Policy
version : not available

Potential Cause: The error appears related to the clientNameBasicContract node, specifically with the PersistentSet collection type used by Hibernate. It seems that XStream may be struggling with the PersistentSet conversion, particularly when referencing stored snapshots.

false true -1 com.csc.pt.svc.data.relational.entity.Policy.clientNameBasicContract false false 192 1 INSURED PMSIPP05 dbo 2024-11-11 03:03:07 00 05 WCV 4343485 00 false ** ** Environment Details:

Hibernate version: 6.5.2
XStream version: [Version here]
Java version: 17
Could you please provide guidance on how to handle this reference error? Specifically, I’m interested in understanding:

If a specific configuration or XStream version would avoid these reference issues.
Any suggestions on customizing the conversion to handle PersistentSet or storedSnapshot differently.
Whether removing or altering the node is advisable in this context.
Thank you for your assistance.

[rani111agrawal]

@joehni could you please help?

[joehni]

XStream's Hibernate support in version 1.4.x is very old. Have a look at pull request #346 to support version 6.x.

[rani111agrawal]

Thank you @joehni for your support. It is working fine now! :)