[lworld] RFR: 8340409: [lworld] Simple serialization and deserialization of core migrated classes [v2]

[Viktor Klang]

On Tue, 8 Oct 2024 19:34:00 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Serialization and deerialization of value classes. 
>> For java.base value classes migrated from identity classes:
>>   - Must be annotated with jdk.internal.MigratedValueClass (in tests too)
>>   - Must have a constructor or static factory method:
>>     - annotated with jdk.internal.value.DeserializeConstrucctor
>>     - constructor parameters must match order and types of serializable fields of the class
>>   - Value class must not have superclass with fields; only Object or abstract w/o fields
>>   - Uses same technique as for Records to extract and concat values from stream to invoke constructor
>>   - Migrated value classes are serialized using the same format/fields as the identity class
>> 
>> Non-migrated value classes throw InvalidClassException
>> 
>> Along the way, refactored code to break out different modes of deserialization: full custom deserialization with custom data, default deserialization only, externalizable, no local class, record, and then added mode to deserialize a value class.
>> 
>> Updates to value class tests and added a combo test to check many combinations of value and identity classes with different parameters.
>
> Roger Riggs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - Merge branch 'lworld' into 8340409-simple-value-deserialize
>  - Merge branch 'lworld' into 8340409-simple-value-deserialize
>  - 8340409: [lworld] Simple serialization and deserialization of core migrated classes
>    
>    Serialization and deerialization of value classes.
>    For java.base value classes being migrated from identity classes:
>      - Must be annotated with jdk.internal.MigratedValueClass (in tests too)
>      - Must have a constructor or static factory method:
>        - annotated with jdk.internal.value.DeserializeConstrucctor
>        - constructor parameters must match order and types of serializable fields of the class
>      - Value class must not have superclass with fields; only Object or abstract w/o fields
>      - Uses same technique as for Records to extract and concat values from stream to invoke constructor
>      - Migrated value classes are serialized using the same format/fields as the identity class
>    
>    Non-migrated value classes throw InvalidClassException
>    
>    Along the way, refactored code to break out different modes of deserialization:
>    full custom deserialization with custom data, default deserialization only,
>    externalizable, no local class, record, and then added mode to deserialize a value class.
>    
>    Updates to value class tests and added a combo test to check many combinations
>    of value and identity classes with different parameters.

src/java.base/share/classes/java/io/ObjectStreamClass.java line 1591:

> 1589:                         return null;
> 1590:                     }})
> 1591:                 .filter(m -> matchFactoryParamTypes(clazz, m, fields))

`m` can be null here, so `matchFactoryParamTypes` needs to check that.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1248#discussion_r1792519912