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JBoss AOP and Spring AOP provide a mechanism known as mix-in for introducing code elements into an application. With this mechanism, the fields and methods defined in the mixin class are appended to the classes that are the target of the mix-in. Well-formed mix-ins should implement an interface that declares the introduced methods. Under the hood, the AOP framework will use bytecode manipulation to make the target class implement the mix-in interfaces. Then, when invoking a mix-in method, programmers must cast the target object to the interface declaring the method. This mechanism is not type-safe either, since Java does not implement any strong type checks on the interfaces (dynamic binding). However, it has the advantage of being far more efficient than reflection. Besides, once the cast is done on the target object, the IDE will be able to provide some support, such as contextual help and code completion. To summarize the introduction mechanism, only the AspectJ language approach is typesafe regarding this feature, since some type-checking mechanism is implemented by the compiler. Tools that follow the framework approach cannot be type-safe, since they remain pure Java, which does not support such a feature. However, the mix-in approach implemented by JBoss and Spring seems to be a good trade-off. Indeed, most programmers would argue that it is more natural to cast an object to a given interface to be allowed to call an introduced method. With AspectJ, the code can sometimes be difficult to read and understand since it can refer to methods that do not exist in any classes or interfaces supported by the target objects.

to enterprise resources (such as corporate databases, message queues, user information, etc.) because the servlet runs in a more secure server-side environment. The JVM and language evolved to become a server-side implementation and a great replacement for CGI applications on the server. In addition to this, web browsers continued to evolve and became even more flexible with the introduction of the Document Object Model (DOM) and Dynamic HTML (DHTML) support. Scripting support was added to the browser with the development of JavaScript (unrelated to Java despite its name) and VBScript. To handle these scripting languages, interpreters were plugged into the browser. An extensible browser architecture proved to be a powerful feature. Thanks to extensibility, applications such as Macromedia Flash added a new virtual machine on top of the browser, allowing for even more flexible and intense applications. The extensible browser then brought about ActiveX technology on the Windows platform, whereby Windows application functionality could be run within the browser when using Microsoft browsers (or alternative ones with a plug-in that supported ActiveX). This powerful solution enabled native functionality to be accessible from networked applications (see Figure 1-2). This got around the restrictions imposed by the security sandbox and lowest common denominator approach of the JVM, but ultimately, this led to problems in the same vein as distributing client-only applications; specifically, a heavy configuration of the desktop, was necessary to get them to work. Although this configuration could be automated to a certain degree, it resulted in two show-stopping points for many.

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This section compares the various advanced features implemented by AspectJ, JAC, JBoss AOP, and Spring AOP. Specifically, we cover aspect instantiation, ordering, and reuse.

First, it didn t always work, as the nature of the configuration, changing the Windows registry, often failed or worse, broke other applications ActiveX controls were rarely self-contained and usually installed runtime support files Different versions of these support files could easily be installed on top of each other a common occurrence leading to broken applications (called DLL Hell) The second problem was security A user s computer, when connected to the Internet, could effectively allow code, written by anybody, to run The ActiveX technology was fully native, not restricted by the Java or HTML sandboxes (more about these in a moment); therefore, users could innocently go to a web page that downloaded an ActiveX control and wrought havoc or stole vital information from their systems As such, many users refused to use them, and many corporate administrators even disallowed them from use within the enterprise.

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