By Stuart Dabbs Halloway
If you are thinking about writing elements in Java, this publication specializes in the part prone you must grasp. DevelopMentor leader Scientist Stuart Halloway provides unheard of, in-depth insurance of writing, deploying, and preserving Java parts. Halloway starts by way of displaying tips on how to use, regulate, and troubleshoot elements. He deals real-world suggestions in retrospect functionality, and demonstrates how mirrored image is used to construct the Java serialization structure. He additionally bargains specified insurance of utilizing the Java local Interface (JNI) to regulate the limits among Java code and elements written in different environments. partially II, Halloway provides a pragmatic imaginative and prescient for utilizing part providers to develop into a more advantageous Java developer. via examples and pattern code, he introduces generative programming strategies that leverage Java into excessive functionality. eventually, construction on those options, he indicates the best way to build powerful interoperability among Java and Win32/COM.
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Additional info for Component Development for the Java Platform
Fm Page 33 Friday, November 9, 2001 3:43 PM Point at 1, 0 MOVE1, RELOAD, or EXIT MOVE1 Point at 2, 0 MOVE1, RELOAD, or EXIT The move implementation is broken; although the PointClient is trying to increment both x and y, only x is changing. Simply reloading the class doesn’t fix the problem. Even though the PointServer is loading a new version of PointImpl, it contains the same defective code as the original. You need to repair the bug in Java and then recompile the fixed version. Make sure that you leave the PointClient process running while you make these changes.
Unfortunately, most of the details of class loading are hidden from view during application development, and some key services are disabled by default. As a result, many application designs do not make effective use of class loaders. Instead, they rely on abstractions such as the classpath to hide the details of deployment. This approach to deployment leads to applications that cannot evolve and adapt at runtime. Worse yet, they do not even fail gracefully; instead, they terminate with exceptions that are far removed from the actual deployment problems.
3. The visibility rule: Classes can only “see” other classes loaded by their class loader’s delegation, the recursive set of a class’s loader and all its parent loaders. In combination, these three rules provide a workable solution to all of the design problems listed above. 1 The Consistency Rule The consistency rule is the easiest to understand. fm Page 24 Friday, November 9, 2001 3:43 PM the already-loaded class. This rule is necessary to prevent nasty surprises for developers and for the virtual machine.