What is the difference between Serializable and Externalizable in Java?
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?
This morning my boss and I had a long and ultimately fruitless discussion about this, in the context of trying to diagnose performance problems with a web application. We didn't really come to any conclusions.
I think we're right in thinking that Serializable non-static inner classes have issues, but we're not sure precisely what the issues are or what exactly to avoid (we reasoned that we co...
I have a problem regarding Java custom serialization. I have a graph of objects and want to configure where to stop when I serialize a root object from client to server.
Let's make it a bit concrete, clear by giving a sample scenario. I have Classes of type
Company
Employee (abstract)
Manager extends Employee
Secretary extends Employee
Analyst extends Employee
Project
Here are the relations:...
I'm using Berkeley DB Java edition, via the DPL interface.
I want to ask if someone knows about any GUI library that could make it easy to browse the data saved in the database.
I know that BDB documentation says that the metadata about the stored entities is not saved in any place and therefore only the person who have written the data can know what are the types of the classes that would b...
I haven't tried this yet, but it seems risky. The case I'm thinking of is instrumenting simple VO classes with JiBX. These VOs are going to be serialized over AMF and possibly other schemes. Can anyone confirm or deny my suspicions that doing behind-the-back stuff like bytecode enhancement might mess something up in general, and provide some background information as to why? Also, I'm inter...
In not so technical way, what is object serialization and the purpose of it? When should it be used?
(any analogies exampls welcome)
Thank You
I have a question about Java serialization in scenarios where you may need to modify your serializable class and maintain backward compatibility.
I come from deep C# experience, so please allow me to compare Java with .NET.
In my Java scenario, I need to serialize an object with Java's runtime serialization mechanism, and store the binary data in permanent storage to reuse the objects in futu...
I have a class that implements java.io.Serializable interface.So all the variables in that class is serilaizable. But i want to make some of the variables are should not serializable. Is it possible?
thanks,
Ravi
I am trying to transmit objects of a particular class from one server to another.
The options I'm looking at are:
Serialize the data as JSON and send
it over the wire using HTTP, and
de-serialize at the other end.
Serialize the data into some binary form and transmit using TCP
sockets.
What are the best practices in this area? What are the gotchas?
Ideally I would like the interface to ...
If I serialize an object in Java, and then later add an extra field to the java class, I can't deserialize the object into the modified class.
Is there a serialization library or some way that I can have deserialization be less strict, like if there is an extra field added to the class then it just fills that with null upon deserialization of the old version of the class?
I have a graph structure in java, ("graph" as in "edges and nodes") and I'm attempting to serialise it. However, I get "StackOverflowException", despite significantly increasing the JVM stack size. I did some googling, and apparently this is a well known limitation of java serialisation: that it doesn't work for deeply nested object graphs such as long linked lists - it uses a stack record f...
I have the following class
class UserAccount implements Serializable
{
public String username;
public String password;
public UserAccount()
{
username = "defaultUsername";
password = "defaultPassword";
}
public UserAccount(String u, String p)
{
username = u;
password = p;
}
private void readObject(ObjectInputStream o)
...
I was going through a blog and one question came to my head. Is it possible to overwrite the way ObjectOutputStream is writing.
Let's say i am writing to a file out.dat i.e.
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(new File("C:\\out.dat")));
out.writeObject(o);
When i opened the file out.dat in Notepad++, i saw the binary data. Which makes sense. What if, I woul...
I am currently working on a videogame, and i want to have the user be able to save their character to a new file. I know how to use the file io (for the most part), but i have been using the 'serialize' to serialize a whole object (that contains all the variables for the character) and save it to a file. The problem is that i am constantly updating the object and making changes to it, so when i...
I have a class that is something like the following:
public class Foo {
static byte[] convertToArray(Foo f);
static Foo convertToFoo(byte[] ba);
}
How can I use convertToArray and convertToFoo to allow Foo to implement java.io.Serializable? The default serialization procedure doesn't seem like a good solution for my class because it would require changing a lot of other classes to implem...
I need a list of classes that implement Serializable.
Could you also tell me what kind of classes implement that interface?
I receive an error:
`IOException on socket listen: java.io.NotSerializableException:` java.net.Socket"`
i try to send an object via socket with this code :
ObjectOutputStream outObjects = new ObjectOutputStream(socket.getOutputStream());
outObjects.writeObject(currentPlayer);
output.flush();
second line gives error.... but i have serialized ( implements Serializable) the class Playe...
I am working in a highly distributed environment. A lot of network access and a lot of db access.
I have some classes that are send over and over the network , and are serialized and de-serialized.
Most of the classes are quite simple in their nature , like :
class A{
long a;
long b;
}
And some are more complex ,( Compound - Collections ).
There are some people in the company I work tha...
I am programming towards the Bloomberg Desktop Java API where I subscribe to and recieve market data in Message objects, containing different fields and corresponding values of different types, through the API. I want to 'record' a sequence of messages so that I can conduct testing of my code that processes these objects by replaying a known sequence of messages. Ideally, I would like to subscr...
Possible Duplicate:
What is the difference between Serializable and Externalizable in Java?
what is the difference between serialization and externalization in java?
