julianhowarth commented on issue #2275:
URL: https://github.com/apache/fory/issues/2275#issuecomment-3196447957
thanks @chaokunyang , I can now debug through. It's the section after the
one you suggested that is problematic (note that the ids are different to the
initially posted class as I've simplified the test slightly):
```
if ((memoryBuffer1.readByte() != ((byte)-3))) {
Object object2 = classResolver.readClassInfo(memoryBuffer1,
contentIdClassInfo).getSerializer().read(memoryBuffer1);
Platform.putObject(video1, 16L,
((com.endeavorstreaming.vesper.content_engine.common.domain.content.ContentId)object2));
} else {
Platform.putObject(video1, 16L, null);
}
```
Tracing the call down, I see the following:
- `readClassInfo` calls down to `readClassInfoWithMetaShare(buffer,
fory.getSerializationContext().getMetaContext())` (as `metaContextShareEnabled`
is `true)
- which calls down to `readClassInfoWithMetaShare`
- in `readClassInfoWithMetaShare` we do `int header =
buffer.readVarUint32Small14()` and `header` is set to `0`
- and then
```
if ((header & 0b1) == 0) {
return getOrUpdateClassInfo((short) id);
}
```
is called and that method is what results in the NPE.
`contentId` itself is a trivial class, though generated by the
[Immutables](https://immutables.github.io/) lib (as are many of the classes
involved here):
```
public final class ContentId
implements
com.endeavorstreaming.vesper.content_engine.common.domain.content._ContentId {
private final String value;
private final int hashCode;
...
}
```
However, what may be of interest is that it does have a `readResolve` which
is generated by Immutables.
```
private Object readResolve() throws ObjectStreamException {
return new ContentId(this, this.value);
}
```
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