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[FWD]C#4JavaErs - Ch1 - Platform Migrati
[版面:窗口里的风景][首篇作者:Gerdo] , 2003年10月18日20:55:44 ,199次阅读,0次回复
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发信人: Gerdo (魔石之主), 信区: DotNet
标  题: [FWD]C#4JavaErs - Ch1 - Platform Migrati
发信站: Unknown Space - 未名空间 (Sat Oct 18 20:55:44 2003) WWW-POST

Platform Migration and Integration
The strength of a technology is rarely the deciding factor in a strategic IT
decision of a large organization. There are companies that will never use a
Microsoft product as a matter of principle, just as there are companies that
will never use anything but Microsoft products. Most companies are more
pragmatic and make their strategic IT decisions based on a more complex set of
criteria.

Many organizations will choose either .NET or Java as their standard
enterprise platform. However, through either good or bad planning, some
organizations will end up with both .NET and Java platforms. This could be to
harness the power of the best technologies from each platform, or simply
because too little control is exercised over the individual departments of an
organization. Often companies will want to integrate their IT infrastructures
and systems closely with their partners, suppliers, and customers who use a
different platform.

Whatever the situation, various options exist for integrating the Java and
.NET platforms, and some for performing Java to .NET migration. While we have
not seen any .NET-to-Java migration tools, we are sure they will appear over
the next few years.

Web Services and Open Standards
A current focus of both Java and .NET is the use of open communication
standards, XML for data representation, and XML Web services as a means of
system integration. This loosely coupled integration capability provides
promising, yet unproven, capabilities to bridge the gap between the two
competing platforms.

Java User Migration Path to Microsoft .NET
The Java User Migration Path to Microsoft.NET (JUMP to .NET) is a set of
technologies designed to simplify the short-term integration and long-term
migration of Java applications and skills to the .NET platform.

JUMP to .NET currently contains two components, Microsoft Visual J# .NET and
the Microsoft Java Language Conversion Assistant (JCA). Both tools are
currently in beta release and are freely available for download from the
Microsoft Web site.

Visual J# .NET
Visual J# .NET is an implementation of Java language syntax, corresponding to
the Java Development Kit (JDK) 1.1.4, that targets the .NET Framework. Visual
J# .NET is fully integrated with the Visual Studio .NET IDE and provides
complete access to the features of the .NET Framework, including
cross-language integration.

Visual J# .NET enables customers with applications written in Microsoft Visual
J++ to migrate them to .NET as painlessly as possible. Although Java
programmers can use Visual J# .NET to develop new applications, it isn't
compatible with J2SE and lacks many of the features a Java programmer would
expect.

Java Language Conversion Assistant
The purpose of the JCA is to convert applications developed using Microsoft
Visual J++ to C# and so only works against JDK 1.1.4ñlevel code.
Currently the JCA will convert most Java language constructs but only about 20
percent of the class library.

It's expected that future releases of the JCA will increase the class library
coverage, but no indication has been made of updating the JCA to convert Java
code developed based on later versions of Java.

Third-Party Products
Other alternatives for cross-platform integration include third-party
middleware products that span both platforms-for example, messaging systems.
In addition, there have been numerous announcements about new products
designed to execute components from both platforms. We anticipate that many of
the predominant J2EE application servers will eventually provide .NET
integration capabilities.

Skills Transfer
Java programmers will have little trouble learning the C# language. The
difficulty in learning to develop for the .NET platform is in learning the
APIs contained in the .NET class libraries. The quickest way for Java
programmers to become proficient in C# and .NET is to read this book and write
code, code, and more code.


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