NotSerializableException: java.io.FileInputStream [英] NotSerializableException: java.io.FileInputStream

问题描述

我的应用程序抛出此错误:

java.rmi.UnmarshalException:错误解组返回；嵌套异常是:java.io.WriteAbortedException:写入中止；java.io.NotSerializableException: java.io.FileInputStream在 java.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:194)在 java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:209)在 java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:161)在 com.sun.proxy.$Proxy40.getEntityBlob(来源不明)在 com.mycompany.backend.repository.EntityRepositoryImpl.getEntityBlob(EntityRepositoryImpl.java:260)

客户"RMI 方法的一面是这样的:

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

还有服务器"这边是这个

 public InputStream getEntityBlob(字符串应用程序ID，字符串命名空间，字符串实体类型，最终字符串 entityId，final String blobKey) 抛出 RemoteException {final InputStream[] inputStream = new InputStream[1];manager.transactPersistentEntityStore(xodusRoot, appId, true, txn -> {EntityId idOfEntity = txn.toEntityId(entityId);最终实体实体 = txn.getEntity(idOfEntity);inputStream[0] = entity.getBlob(blobKey);});返回输入流[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?

解决方案

不可能通过 RMI 传输 InputStream

参见:通过 RMI 传输流的策略

My app is throwing this error:

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)

The "client" side of the RMI method is this:

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

And the "server" side is this

  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];
  }

Does it mean that FileInputStream cannot work with RMI? Or it should work and there's just a problem with my code?

解决方案

It's not possible to transmit an InputStream over RMI

See: Strategy to transmit a stream over RMI

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