Serialization Section Index | Page 5
Can I use an arbitrary long value for serialVersionUID when I declare it in my class?
If you don't have any previously serialized objects of that class
around, you can initialize serialVersionUID to any long
value you want. However, if you do have older versions of your class
and ...more
I keep getting an InvalidClassException when I read in my serialized objects. What am I doing wrong?
An InvalidClassException is thrown if the serial
version of the object read from the stream does not match
that of the loaded class. What probably happened is you
changed your class definition s...more
Is there a maximum size of a serialized object tree graph?
There are limits, but it's difficult to quantify most of them.
For example, the JVM stack size affects the graph serialization,
since the tree walking is done depth-first, recursively. (This is
c...more
When trying to serialize large strings, or pass large strings as parameters to remote methods, I keep getting a java.io.EOFException. This only happens for trings, not for other large objects. What is the problem?
When trying to serialize large strings, or pass large strings as parameters to remote methods,
I keep getting a java.io.EOFException. This only happens for strings, not for other
large objects. W...more
If an object is serialized by a 1.1.x VM, can it be de-serialized by a 1.2.x VM?
Yes. No special steps are needed for this to work.
Using ObjectOutputStream, how can I use writeObject() to write the same object twice, so on the other end readObject() will read two separate objects, not two references to the same object?
Java's serialization mechanism keeps track of which objects were written to
an ObjectOutputStream; when an object is written for the
second time a object handle is sent in place of the actual obj...more
I want to have complete control of the binary file format generated by ObjectOutputStream, so I implemented Externalizable in my objects and extended ObjectOutputStream so that I could overwrite the writeStreamHeader() and readStreamHeader() methods.
I want to have complete control of the binary file format
generated by ObjectOutputStream, so I
implemented Externalizable in my objects and
extended ObjectOutputStream so that I could
overwrite t...more
How do I load a serialized applet?
Instead of specifying the CODE attribute of an <APPLET> tag, you use the OBJECT attribute, as in:
<APPLET
OBJECT=TheApplet.ser
WIDTH=300
HEIGHT=300
>
</APPLET>
This allow...more
What is UTF that Serialization uses to write strings?
The Java programming language was designed from the ground up
to be compatible with multiple character sets from multiple
languages. This entails using a non-ASCII character and string
representa...more
Can an application running in a version 1.1.x JVM read an object that was serialized by an application running in a version 1.2.x JVM?
Changes were made to the default serialization stream format
between version 1.1.x and version 1.2.x of the JDK. As a
result, if you are writing objects with one version and reading
them with an...more
What resources are available to read Java serialized output in C++ programs?
Tools.h++ Professional by RogueWave
http://www.roguewave.com/products/toolspro/
How can I validate what I've just deserialized?
When an object is deserialized, its internal state is
restored to what it was at the time of serialization.
So if you serialized a good object, you will get a good
object back or an exception will...more
Can I use a BufferedOutputStream with an ObjectOutputStream to serialize an object?
Yes. In fact, it is recommended that
you buffer all your input and
output unless you have a good reason
not to.
Here's an example of how to do this:
...
String myobject = new String("my...more
Does serialization depend on the browser, platform, or VM?
The serialization format is independent
of browser, independent of JVM vendor,
and independent of platform. So
serialization should work with any
combination of the above.
For example, a serializ...more
What are the advantages and disadvantags of serialization?
The advantages of serialization are:
It is easy to use and can be customized.
The serialized stream can be encrypted, authenticated and compressed, supporting the needs of secure Java comput...more
