The serialPersistentFields feature described later can be used to overcome this limitation in Java

Making ANSI/AIM Code 39 in Java The serialPersistentFields feature described later can be used to overcome this limitation
The serialPersistentFields feature described later can be used to overcome this limitation
Print Code 39 Extended In Java
Using Barcode generator for Java Control to generate, create Code 39 image in Java applications.
the class's base class cannot be changed the type of a primitive field cannot be changed the class cannot be changed from Serializable to Externalizable or vice versa, or from either to neither the class's readObject, readResolve, writeObject and writeReplace methods if any cannot be added, altered, or removed so as to create incompatibilities between the data streams which they decode or encode and data streams decoded or encoded by earlier versions the design is not intended to cope with version branching where a class evolves along two or more independent paths; class versioning under serialization is only designed to cope with linear evolution of a class[7]
Barcode Printer In Java
Using Barcode drawer for Java Control to generate, create bar code image in Java applications.
In other words, the case of class A1 evolving into A2 and then A3 is handled, so
Scanning Bar Code In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
that any of A1, A2, or A3 can be located at either the sender or the receiver, but not the case where A1 evolves into A2 and also, independently, into A3, where no evolution relation exists between A2 and A3 Consider the latter case in a configuration where A2 is located at the sender and A3 at the receiver That's what you can't do What's left These rules do permit rearranging existing fields, and adding new fields In addition, the types of non primitive members can be changed in type compatible ways:
Code 3 Of 9 Maker In Visual C#
Using Barcode encoder for .NET framework Control to generate, create ANSI/AIM Code 39 image in VS .NET applications.
for example, the type of a String member can be changed to Object, because objects of type String can be assigned to objects of type object[8]
Create Code-39 In .NET Framework
Using Barcode printer for ASP.NET Control to generate, create Code 39 image in ASP.NET applications.
Note however that this may break the code of the class in other ways We are only concerned in this section with compatibility under serialization 392 Adding and rearrang ing fields Under serialization, fields are written and read by name, not by position This is why merely rearranging the order of fields is entirely benign When fields are added, there are two cases of interest to consider 1 If an object is written by an older version of the class and then read by an evolved version with additional fields, those fields are set to their default values: false, 0, or null, according to type 2 If an object is written by an evolved version of the class and subsequently read by an earlier version of the class without the additional fields, the additional data written by the evolved version is silently ignored Fields can be rearranged and new fields added in a single evolution of the class All this is handled automatically by Java serialization, without intervention by the programmer You can also do all this yourself: you can design and write the writeObject and readObject methods of a serializable class to cope with class versioning, using optional data as described in 362 to serialize fields added since the first version of the class Why would you bother 393 Limitations RMI/IIOP RMI over IIOP (see 14) does not use default serialization as a lower level object transport Its versioning properties are not specified by Sun Of the relevant specifications, the CORBA 23 specification 1062[9] merely states: "When an orb run time receives a value [which has been versioned], it is free to raise a bad_param exception It may also try to resolve the incompatibility by some means If it is not successful, then it shall raise the bad_param exception" (emphasis added)
Painting Code39 In Visual Studio .NET
Using Barcode maker for VS .NET Control to generate, create ANSI/AIM Code 39 image in .NET framework applications.
http://cgiomgorg/cgi bin/doc formal/98 12 01
Printing Code39 In Visual Basic .NET
Using Barcode generation for VS .NET Control to generate, create Code 3 of 9 image in Visual Studio .NET applications.
However, the CORBA 23 Java to IDL Language Mapping specification 28356 states: "If the class does not implement javaioExternalizable but does have a writeObject method, then all the semantics of javaioObjectOutputStream and javaioObjectInputStream supported by RMI over jrmp are supported over IIOP"[10]
Painting EAN / UCC - 13 In Java
Using Barcode creation for Java Control to generate, create EAN-13 image in Java applications.
[10]
EAN / UCC - 14 Generator In Java
Using Barcode creator for Java Control to generate, create UCC-128 image in Java applications.
http://wwwomgorg/cgi bin/doc orbos/98 03 10
Barcode Drawer In Java
Using Barcode creator for Java Control to generate, create bar code image in Java applications.
In other words, you will get automatic versioning of a class over IIOP if the class (a) implements Serializable but not Externalizable and (b) provides an writeObject method Normally this would be the trivial implementation:
Print Data Matrix In Java
Using Barcode creation for Java Control to generate, create DataMatrix image in Java applications.
private void writeObject(ObjectOutputStream out) throwsIOException {
Barcode Creator In Java
Using Barcode encoder for Java Control to generate, create bar code image in Java applications.
outdefaultWriteObject(); }
USPS Confirm Service Barcode Encoder In Java
Using Barcode generator for Java Control to generate, create USPS Confirm Service Barcode image in Java applications.
Both the Sun and the IBM Java ORBs are intended to support class versioning even without a writeObject method, although this fact was not documented at the time of writiing[11] However, a simple experiment with the JDK 13 RMI/IIOP implementation shows that, without a writeObject method, the only versioning feature supported by RMI/IIOP is rearrangement of fields; sending a class version with added or deleted fields causes an exception to be thrown at the receiver JDK 131 contains a correction to this problem, although "there will be interoperability problems when J2SDK 131 tries to send any evolved classes to J2SDK 13"[12] See Bug Id 4365188 in the Java Developer Connection Bug Parade for details You should test your own version of the JDK before relying on any form of class versioning over IIOP
Data Matrix 2d Barcode Encoder In VS .NET
Using Barcode creation for .NET Control to generate, create DataMatrix image in VS .NET applications.
[11]
Making ANSI/AIM Code 128 In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create Code 128 Code Set B image in ASP.NET applications.
Technology Architect, IBM Java Technology Centre, private communications, 13 15 December, 2000
Paint ANSI/AIM Code 39 In .NET Framework
Using Barcode encoder for .NET Control to generate, create Code-39 image in .NET framework applications.
[12]
Decode Data Matrix In VS .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
UPCA Encoder In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create UPCA image in ASP.NET applications.
Creating Code-128 In VB.NET
Using Barcode encoder for .NET framework Control to generate, create Code 128 image in VS .NET applications.