NotSerializableException：java.io.FileInputStream

Question

我的应用程序抛出此错误：

java.rmi.UnmarshalException: error unmarshalling return; nested exception is: 
    java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: java.io.FileInputStream
    at java.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:194)
    at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:209)
    at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:161)
    at com.sun.proxy.$Proxy40.getEntityBlob(Unknown Source)
    at com.mycompany.backend.repository.EntityRepositoryImpl.getEntityBlob(EntityRepositoryImpl.java:260)

RMI 方法的“客户端”是这样的：

Registry registry = LocateRegistry.getRegistry();
EntityRepository repository =
    (EntityRepository) registry.lookup(EntityRepository.class.getName());
return repository.getEntityBlob(appId, namespace, entityType, entityId, blobKey);

“服务器”端是这样的

  public InputStream getEntityBlob(
      String appId,
      String namespace,
      String entityType,
      final String entityId,
      final String blobKey) throws RemoteException {
    final InputStream[] inputStream = new InputStream[1];
    manager.transactPersistentEntityStore(xodusRoot, appId, true, txn -> {
      EntityId idOfEntity = txn.toEntityId(entityId);
      final Entity entity = txn.getEntity(idOfEntity);
      inputStream[0] = entity.getBlob(blobKey);
    });
    return inputStream[0];
  }

这是否意味着 FileInputStream 不能与 RMI 一起工作？或者它应该可以工作，只是我的代码有问题？

Answer 1

无法通过 RMI

传输 InputStream

参见：Strategy to transmit a stream over RMI