Damir Murat's Library tagged spring → View Popular

Spring is still very much a valid technology in today's environment, but the frontiers have shifted.
One shift is in the increasing recognition of the shortcomings of the Java language itself, and the need for an eventual replacement as the premier JVM language. Another shift is the increasing awareness of the need for modularity in application development. My view is that without the backing of a truly modular framework, it is almost impossible to build a large enterprise application which does not end up becoming unwieldy, difficult to manage, and slow to build and deploy. This more than anything else leads to the perception that Java is unproductive to work with.
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- The reason for this stems from Impala's dynamic reloading capability.
- With Impala and other dynamic modularity frameworks, modularity is achieved through a separation of interface and implementation
- With Impala, modularity is enforced at the class loader level.
- Impala makes it simple to deploy multiple flavours of the same application simply by choosing which modules to deploy. Impala gives you mechanisms for configuring individual modules, so that you can support different deployment options in a clean and simple way.
- Impala works "out of the box"
- With Impala, Spring integration testing is a doddle
- With Impala, all you need to do in a typical integration test is to specify which modules you want to include (dependent modules get included automatically), and use Impala's API to access beans either from the root or one of the module application contexts.
- With Impala you can write truly multi-module web applications
- A big barrier to truly modular web applications is the reliance on web.xml, because changes to web.xml require a full application reload. The forthcoming release of Impala allows you to define servlets and filters within the modules themselves, with their life cycle tied to that of the containing module. It also allows you to map requests with arbitrary URL path prefixes to individual modules. Once within a module, requests can be mapped to filters and servlets based on file extension.
- Impala does not reinvent the Spring programming model
- Impala does not reinvent the Spring programming module - within modules you will recognise all the artifacts familiar to Spring applications: collaborators wired together via dependency injection, configured using XML configuration files, annotations, etc. The big difference is that Impala gives you a well defined way for expressing relationships between modules within the application, allowing for simpler implementations of - and clear boundaries between - the constituent parts of a bigger application.
- Impala fundamentally simpler to use than OSGi-based alternatives
- OSGi is a powerful technology, a very complete modularity solution. It is also quite a complex technology, requiring a non-trivial investment in time and energy to understand it, both conceptually and in its effect on the application environment.
- From a practical point of view, applying OSGi to enterprise environments is far from trivial, and involves solving a number of challenging technical problems. For example, many common Java libraries do not ship out the box in an OSGi-friendly way. Also, the use of the thread context class loader in many libraries poses a problem for OSGi-based applications.
- Where Impala differs from traditional applications is the way that you manage application modules. In a WAR file, these will be bundled in a the modules directory under /WEB-INF.
- The relationship between modules can be hierarchical, or even in the form of a graph of dependencies. The important point is that modularity is applied to your application's code. That is in my opinion the part which needs it most because that's the part of your application which changes frequently.
- Impala is a practical solution for practical problems
- Impala did not evolve from an ivory tower view of how Java enteprise applications are supposed to be written. Instead, it was borne around two years ago out of the need to solve practical real world problems which were harming the productivity and maintainability of a large Java project. The most notable of these were the lack of any first class modularity in traditional Spring-based application development, and the slow build/deploy/test cycles arising from unwieldy integration tests.
- Impala has been designed and refactored to be simple and intuitive to work with, once you've grasped the basic concepts. It allows you to get the benefits of a modular approach to application development without many of the costs, and without being swamped by technobabble.

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With the Spring Security Kerberos Extension, your users are authenticated against your web application just by opening the URL. There is no need to enter a username/password and no need to install additional software.
Kerberos is a standardized network authentication protocol, which is designed to provide strong authentication for client/server application, like web applications where the Browser is the client. It is also the recommended way to authenticate users in a Windows network and it replaces the outdated and relatively insecure NTLM. Besides this, it is widely used in *NIX environments and there are implementations for every major platform.
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- your user just enters the URL and he is automatically authenticated with his domain username, for example mikewiesner@SPRINGSOURCE.COM. You can then find out this username via Spring Security or even with request.getRemoteUser().
- The Browser sends a GET request to your web application (1), which then returns that "negotiate" authentication is required (2). The Browser will then ask the Kerberos Server to get a so called service ticket (3). The Browser then send this service ticket, which proves the identity of the caller, and some additional things to the web application (5). After validating the ticket, based on some shared secret between your web application and the Kerberos server, you get back the username.
- For this to work, every web applications needs to be registered at the Kerberos server and gets a service prinicipal and a shared secret assigned. For web applications, the service principal must be "HTTP/<full qualified domain name>@DOMAIN". For example "HTTP/web.springsource.com@SPRINGSOURCE.COM", if your app runs on web.springsource.com. You then need to export the credentials of this principal to a keytab file (shared secret) and make this available to your application. Every Kerberos based system will work this way, but the creation of this service principal and the keytab is different between the systems.

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