serializable | 易学教程

Does adding [Serializable] to the class have any performance implications?

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I need to add the [Serializable] attribute to a class that is extremely performance sensitive. Will this attribute have any performance implications on the operation of the class? Instances of attribute classes are only created when they're first accessed. If you don't do any serialization on that particular class, the SerializableAttribute() constructor will never be called, hence it won't cause any performance issues. Here's an interesting article about attribute constructors: http://www.codingonthetrain.com/2008/10/attribute-constructors.html Attributes are a metadata annotations so they

Redis Serialization and Deserialization

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问题 I have noticed that some of my serialized objects stored in Redis have problems deserializing. This typically occurs when I make changes to the object class being stored in Redis. I want to understand the problem so that I can have a clear design for a solution. My question is, what causes deserialization problems? Would a removal of a public/private property cause a problem? Adding new properties, perhaps? Would a adding a new function to the class create problems? How about more

Can you override the stream writers in scala @serializable objects?

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问题 I now understand that scala @serializable objects can be used the same as a Java Serializable object. In a Java Serializable object there are methods you can override to change how the object streams: writeObject(ObjectOutputStream) / readObject(ObjectOutputStream). Can you override or inject methods into a scala @serializable object allowing you to change how the object serializes? 回答1: Yes, you can use the same methods in Scala as in Java: @throws(classOf[IOException]) private def

Who actually implements serializable methods?

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问题 I've been learning how to use Serializable . I know if I create a class 'A' with different variables who implements Serializable and I add Serializable to my class, it's also Serializable . But, who is actually implementing those two methods to serialize? Does Object take care of everything or different classes overloads them when necessary? 回答1: The serialization is actually implemented in java.io.ObjectOutputStream (and java.io.ObjectInputStream) and some of its helper classes. In many

File extension for a Serialized object

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What file extension would be most suitable when saving a Serializable object to disk? FileOutputStream fos = null; ObjectOutputStream out = null; try { fos = new FileOutputStream(filename); out = new ObjectOutputStream(fos); out.writeObject(mySerializableObject); } catch (IOException ex) { ex.printStackTrace(); } finally { IOUtils.closeQuietly(out); } ".ser" is a reasonable choice for the file suffix - http://www.file-extensions.org/ser-file-extension However, you could argue that it make little difference what suffix you use ... provided that is doesn't clash other commonly used application

GWT - occasional com.google.gwt.user.client.rpc.SerializationException

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we are haunted by occasional occurences of exceptions such as: com.google.gwt.user.client.rpc.SerializationException: Type 'xxx' was not assignable to 'com.google.gwt.user.client.rpc.IsSerializable' and did not have a custom field serializer.For security purposes, this type will not be serialized.: instance = xxx at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:610) at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:129) at com.google.gwt.user.server.rpc

What is the penalty for unnecessarily implementing Serializable?

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I need to develop a Java RMI application for my distributed systems class. During the lecture, the professor was stressing to only let classes implement Serializable that have to be passed by value over the network. This implies that there is some downside or penalty to letting too many classes implement Serializable . Classes that don't require to be sent over the network. I don't see how there could be any downside since the serialization/deserialization would never happen if you never actually send it over the network. What is the penalty for unnecessarily implementing Serializable? There

How to use Spring services in JSF-managed beans?

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问题 JSF is very popular technology in Java world, however, cooperation with Spring is still painfull and requires 'nasty' hacks. I have currently the problem with one of this 'hacks'. Spring services are injected using the SpringBeanFacesELResolver . It is configured in faces-config.xml : <application> <el-resolver> org.springframework.web.jsf.el.SpringBeanFacesELResolver </el-resolver> </application> The injection of Spring services is very ugly, but it is working: @ManagedProperty(value="#

Portable class library: recommended replacement for [Serializable]

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I am porting a .NET Framework C# class library to a Portable Class Library. One recurring problem is how to deal with classes decorated with the [Serializable] attribute, since this attribute is not part of the Portable Class Library subset. Serialization functionality in the Portable Class Library subset instead appears to be covered by DataContractAttribute . To preserve as much of functionality as possible in the Portable Class Library, is it sufficient to replace [Serializable] with the [DataContract] attribute (with the implication that all fields and properties subject to serialization

Socket program to send and receive user defined objects not working

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问题 I have a user defined class Message, whose object I would like to pass between the client and the server. The Message class is as follows: import java.io.Serializable; public class Message implements Serializable { String CorS; int data_id; int status_id; Integer value; boolean withdraw; public Message() { CorS = null; data_id = 0; status_id = 0; value = 0; withdraw = false; } public Message(String CorS, int data_id, int status_id, Integer value) { this.CorS = CorS; this.data_id = data_id;