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Questions tagged [objectoutputstream]

The Java ObjectOutputStream serialization class from the Java standard library.

ObjectOutputStream is a class from the Java standard library that can be used to serialize and write objects previously that can later be read and deserialized by an ObjectInputStream instance.

566 questions
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How to better debug nullpointer exceptions in Java

I'm creating a Client/Server program that will send a serializable object back and forth. i have no idea how that nullpointer exception occurs it points to the line where the btnSave responds to the Click event, and the OutputStream object tries to…
joe
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GetFieldID: unable to find field Ljava/util/HashMap;.loadFactor:F

My Android app serializes objects (with ObjectOutputStream). Each time I deserialice one (with ObjectInputStream), I get lots of debug messages like this: 01-20 06:44:22.274: D/dalvikvm(2204): GetFieldID: unable to find field…
hpique
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Object sent via ObjectStreams do not keep their field values?

I've been developping a chat client/server to get familiar with java, and I've run into a logic bug I don't understand. I'm sending an object through a ObjectOutputStream (Message object, see ref), which contains fields and another object, which has…
Thomas P
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Sending Java object of an unknown class

searching for a long time, but didn't find any answer on that one: I have a server and I have a client. The server should receive an object via ObjectInputStream and ObjectOutputStream. That already works for any class, known on the server. Now I…
manima
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Exception catch on ObjectOutputStream

In my software i need to send messages between client and server through an ObjectOutputStream. The core of the sender method is the following: .... try { objWriter.writeUnshared(bean); objWriter.flush(); } catch (Exception e) { …
Matteo Gatto
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Store the actual class logic/blueprint and load it again

If I have a class like this: class Foo implements HasBarMethod { public double bar(double x) { return x*x; } } Now I have Foo foo = new Foo(); someObjectOutputStreamToSomeFile.writeObject(foo); which is executed. Later I decide to change…
Herbert
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IKVM.NET object serialization with ObjectOutputStream differences

I have a java program (jar) that serialize a class to file with ObjectOutputStream. I need to use this part of the program inside a .NET project and to do so i have converted the jar to a .NET dll with ikvmc.exe. Everything works fine but the…
Luca Looz
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Java - Sending byte object over socket

I'm using an ObjectOutputStream over my socket because I created a new class that needs to be transported between the client and the server. I also created a unique thread that sends one byte every one second over the stream to the server in order…
Onca
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(objectinputstream) ObjectInput.readObject() is giving me an empty object

I have this class: public class SaveState implements Serializable { private static final long serialVersionUID = 1L; public List downloadedMagazinesIds = new ArrayList();//id's de revistas descargadas public List…
NullPointerException
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OutputStream delete file contents JAVA

I have files in who I need to record serialized object. I open ObjectOutputStream for writing in files. If I didn't wrote nothing in file, file content get deleted. I don't want content to be deleted when I make ObjectOutputStream. My code (I use…
QBox
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Closing the stream only if it's opened

Consider this code: FileOutputStream stream=null; ObjectOutputStream objStr=null; try { stream=new FileOutputStream(defaultFile); objStr=new ObjectOutputStream(stream); objStr.writeObject(obj); …
Ramy Al Zuhouri
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InputStream object method close() crashes on real device

I am programming a simple I/O system to store data needed by my Android application. I use an ObjectInputStream with the following initialization ("context" is the object obtained with getApplicationContext(): ObjectInputStream ois = new…
user1267776
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unable to transfer transferring image via Bluetooth android

I am developing an application on android that share contact info + picture I have class Stuff that contains whole info. import java.io.Serializable; public class Stuff implements Serializable { private String name; private String…
Ahmed
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ObjectInputStream.readObject() hangs forever during the process of socket communication

I have encountered a problem of socket communication on linux system, the communication process is like below: client send a message to ask the server to do a compute task, and wait for the result message from server after the task completes. But…
Shawn Lee
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Android and ObjectOutputStream to resource file

I'm really new to Android development, and my first project was a simple game which has a display and a logic part. I would like to add a save feature to the game, but I'm having trouble with the implementation. I would like to do it this way, with…
Balázs Édes
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