julianhowarth commented on issue #2275:
URL: https://github.com/apache/fory/issues/2275#issuecomment-3183408493
I'm hitting this same error case, let me provide some details in case it
provides some clues - I have a object model of around 150 classes (so not easy
to provide a reproducer) but nothing too complex, no cycles and no custom
serializers etc.
If I use:
```java
Fory.builder()
.withLanguage(Language.JAVA)
.requireClassRegistration(false)
.build();
```
then I can serialize and deserialize my object graph perfectly. However,
once I switch to:
```java
Fory.builder()
.withLanguage(Language.JAVA)
.requireClassRegistration(false)
.withCompatibleMode(CompatibleMode.COMPATIBLE)
.build();
```
then I see the error above, though with a slightly different stack:
```
java.lang.NullPointerException: Cannot read field "serializer" because
"classInfo" is null
at
org.apache.fory.resolver.ClassResolver.getOrUpdateClassInfo(ClassResolver.java:1322)
at
org.apache.fory.resolver.ClassResolver.readClassInfoWithMetaShare(ClassResolver.java:1568)
at
org.apache.fory.resolver.ClassResolver.readClassInfo(ClassResolver.java:1879)
at
com.endeavorstreaming.vesper.content_engine.common.domain.video.VideoForyCodecMetaShared1_0.readFields1$(VideoForyCodecMetaShared1_0.java:169)
at
com.endeavorstreaming.vesper.content_engine.common.domain.video.VideoForyCodecMetaShared1_0.read(VideoForyCodecMetaShared1_0.java:766)
at
com.endeavorstreaming.vesper.content_engine.common.load.RealmContentItemForyCodecMetaShared0_0.read(RealmContentItemForyCodecMetaShared0_0.java:48)
at org.apache.fory.Fory.readDataInternal(Fory.java:1055)
at org.apache.fory.Fory.readNonRef(Fory.java:978)
```
Digging in a bit with a debugger I see that `registeredId2ClassInfo` array
in `ClassResolver` has 190 elements, of which 29 are `null`. The `classId`
supplied to `getOrUpdateClassInfo` is `0` which is one of the null elements.
I'm using Fory `0.11.2` on Java 21.0.8 on Fedora linux.
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