Scala 3 lazy vals break FieldSerializer (original) (raw)

Scala 3 changed the implementation of lazy vals. Classes containing a lazy val end up with a field called 0bitmap$1:

Compiled from "Test.scala"
public class Test implements scala.Product,java.io.Serializable {
  public static final long OFFSET$0;
  public long 0bitmap$1;
  private final byte a;
  ...

Trying to serialize an instance of such a class fails with

Cause: java.lang.ClassFormatError: Illegal field name "0bitmap$1" in class io/altoo/akka/serialization/kryo/TestFieldAccess
    at java.base/java.lang.ClassLoader.defineClass1(Native Method)
    at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
    at com.esotericsoftware.reflectasm.AccessClassLoader.defineClass(AccessClassLoader.java:78)
    at com.esotericsoftware.reflectasm.AccessClassLoader.defineAccessClass(AccessClassLoader.java:57)
    at com.esotericsoftware.reflectasm.FieldAccess.get(FieldAccess.java:173)
    at com.esotericsoftware.kryo.serializers.CachedFields.addField(CachedFields.java:147)
    at com.esotericsoftware.kryo.serializers.CachedFields.rebuild(CachedFields.java:99)
    at com.esotericsoftware.kryo.serializers.FieldSerializer.<init>(FieldSerializer.java:82)
    at com.esotericsoftware.kryo.serializers.FieldSerializer.<init>(FieldSerializer.java:68)
    at jdk.internal.reflect.GeneratedConstructorAccessor27.newInstance(Unknown Source)