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Easy Learn Java: Programming Articles, Examples and Tips - Page 286


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PHP To Challenge J2EE and .NET

Go to all tips in General Java

Sun doesn't have enough problems.

Zend Technologies Inc, the keeper of PHP, a constituent of LAMP, the multi-headed god of open source, is taking on J2EE, one of the last remaining places where Sun still shines, seeking to replace it.

PHP is also a rival of Microsoft's .NET, but Microsoft shops tend to be more dyed-in-the-wool, across-the-board Microsoft adherents and so harder to dislodge, according to Zend marketing VP Pamela Roussos.

According to Forrester Research, by 2006 22% of all enterprise apps will probably be written in J2EE, 13% in .NET, 56% in both and 9% in something else. Zend is aiming to be that 9% and more and whatever progress it makes is likely to come out of Sun's hide, with Zend feeding off of J2EE's overweening complexity

Zend says...



3 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Wednesday, January 12, 2005 (00:00:00) (2531 reads)

Unbreakable Java: A Java Server That Never Goes Down

Go to all tips in Networking

Developers using Java on clients or in small projects may not believe that there is a fundamental problem with Java's robustness. People working with huge applications and application servers written in Java know about the problem but may doubt that it's possible to build something like an unbreakable Java architecture. Some may even remember the White Star Line promising that their ocean liner Titanic was unsinkable; an iceberg in the North Atlantic proved them wrong and demonstrated that there is no such thing as an unsinkable ship. Is it really possible to build a Java application server that never goes down?

It's All About Isolation
The key to understanding robust Java is isolation, isolation, and isolation. Robust applications, especially robust application servers, require a high level of isolation between users. It's not acceptable that an error occurring while processing one user's request may affect all users connected to the system. The complexity of software systems makes it impossible to develop software that is completely free of errors, so errors will always happen. Only isolation can provide real robustness by limiting the impact of errors.

The design of the Java Virtual Machine ignores the painful lessons operating system vendors have learned in the past 40 years. The concepts of processes, virtual memory management, and different protection modes for kernel and user code can be found in all modern operating systems. They focus on the question of isolation and therefore robustness: an application with errors cannot affect the other applications running in the system.

In contrast, Java follows the all-in-one-VM paradigm: everything is processed inside one virtual machine running in one operating system process. Inside the VM, parallelism is implemented using threads with no separation regarding memory or other resources. In this respect Java has not changed since its invention in the early nineties. The fact that Java was originally invented as a programming language for embedded devices may explain this approach.

There Is No Isolation in Java

Why and what can be done read more here



1 comment | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Tuesday, January 11, 2005 (00:00:00) (2838 reads)

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