kryo序列化-Java序列化期间发生错误

Question

我的应用程序有许多域对象，这些对象通过spring-session序列化到Redis存储中。 我正在尝试使用Kryo（4.0.0）进行自动序列化，而无需使对象明确可序列化。

尝试序列化尚未实现Serializable对象时出现以下错误。

com.esotericsoftware.kryo.KryoException: Error during Java serialization.
    com.esotericsoftware.kryo.serializers.JavaSerializer.write(JavaSerializer.java:51)
    com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651)
    org.springframework.session.data.redis.KryoObjectSerializer.serialize(KryoObjectSerializer.java:51)
    org.springframework.data.redis.core.AbstractOperations.rawHashValue(AbstractOperations.java:168)
    org.springframework.data.redis.core.DefaultHashOperations.putAll(DefaultHashOperations.java:129)
    org.springframework.data.redis.core.DefaultBoundHashOperations.putAll(DefaultBoundHashOperations.java:86)
    org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.saveDelta(RedisOperationsSessionRepository.java:778)
    org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.access$000(RedisOperationsSessionRepository.java:670)
    org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:388)
    org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:245)
    org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.commitSession(SessionRepositoryFilter.java:245)
    org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.access$100(SessionRepositoryFilter.java:217)
    org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:170)
    org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
    org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
JBWEB000071: root cause

java.io.NotSerializableException: mypck.UserDomain
    java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
    java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
    java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
    java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
    java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
    java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
    java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
    java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
    java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
    java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
    java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
    java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
    java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
    java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    com.esotericsoftware.kryo.serializers.JavaSerializer.write(JavaSerializer.java:48)
    com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651)
    org.springframework.session.data.redis.KryoObjectSerializer.serialize(KryoObjectSerializer.java:51)
    org.springframework.data.redis.core.AbstractOperations.rawHashValue(AbstractOperations.java:168)
    org.springframework.data.redis.core.DefaultHashOperations.putAll(DefaultHashOperations.java:129)
    org.springframework.data.redis.core.DefaultBoundHashOperations.putAll(DefaultBoundHashOperations.java:86)
    org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.saveDelta(RedisOperationsSessionRepository.java:778)
    org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.access$000(RedisOperationsSessionRepository.java:670)
    org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:388)
    org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:245)
    org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.commitSession(SessionRepositoryFilter.java:245)
    org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.access$100(SessionRepositoryFilter.java:217)
    org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:170)
    org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
    org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)

我的Kryo初始值设定项：

private Kryo getInstance() {
    Kryo kryo = new Kryo() { 
            @Override 
            public Serializer<?> getDefaultSerializer( final Class type ) { 
              if (AbstractPersistentCollection.class.isAssignableFrom( type )) { 
                  return new BeanSerializer( this, type );
              } else if (Serializable.class.isAssignableFrom( type )) {
                  return new JavaSerializer();
              } 

              return super.getDefaultSerializer( type ); 
            } 
          }; 

          kryo.setInstantiatorStrategy(new SerializingInstantiatorStrategy());

    return kryo;
}

更新1：

com.esotericsoftware.kryo.KryoException: Error during Java serialization.
Serialization trace:
authentication (org.springframework.security.core.context.SecurityContextImpl)
    com.esotericsoftware.kryo.serializers.JavaSerializer.write(JavaSerializer.java:51)
    com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575)
    com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)
    com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:505)
    com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651)
    org.springframework.session.data.redis.KryoObjectSerializer.serialize(KryoObjectSerializer.java:52)
    org.springframework.data.redis.core.AbstractOperations.rawHashValue(AbstractOperations.java:168)
    org.springframework.data.redis.core.DefaultHashOperations.putAll(DefaultHashOperations.java:129)
    org.springframework.data.redis.core.DefaultBoundHashOperations.putAll(DefaultBoundHashOperations.java:86)
    org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.saveDelta(RedisOperationsSessionRepository.java:778)
    org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.access$000(RedisOperationsSessionRepository.java:670)
    org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:388)
    org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:245)
    org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.commitSession(SessionRepositoryFilter.java:245)
    org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.access$100(SessionRepositoryFilter.java:217)
    org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:170)
    org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
    org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
JBWEB000071: root cause

java.io.NotSerializableException: mypkg.UserDomain
    java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
    java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
    java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
    java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
    java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
    java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
    java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)

Answer 1

由于您正在使用Java serializer （已从异常中清除），因此您的类mypck.UserDomain必须实现serializable或Externalizable 。

从文档

Kryo的JavaSerializer并使用标准Java序列化。 这种方法将与通常的Java序列化一样慢，但是只要Java序列化能够对其进行序列化，就可以使您的类序列化。 当然，您的类应实现通常的Java序列化所需的Serializable或Externalizable接口。

出现异常的原因是

您可能一直在研究composite object ，在该composite object中container class是可serializable但是至少其中一个contained class是不可serializable 。

Kyro采用了将您的对象传递给Kryo.writeObject(...) API的类的序列化器。

另外，移除

ryo.setInstantiatorStrategy(new SerializingInstantiatorStrategy()); 如果您在Kryo.readObject(...)中传递其对象的对象类未实现可serializable ， Kryo.readObject(...)不起作用

更好的是，删除它，现在所有序列化将由Kryo （统一）完成

  public Serializer<?> getDefaultSerializer( final Class type ) { 
       if (AbstractPersistentCollection.class.isAssignableFrom( type )) { 
             return new BeanSerializer( this, type );
          } else if (Serializable.class.isAssignableFrom( type )) {
             return new JavaSerializer();
      } 
   }