Open source portals(选择)

本文探讨了企业门户服务器领域中标准支持的重要性,并介绍了多个开源项目,如ExoPlatform、Liferay Portal、JetSpeed、JBoss Portal和GridSphere,它们均支持JSR168和WSRP等标准。

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Standards support is an important criterion for most corporate development projects. In the area of enterprise portal servers, that means a J2EE-compliant engine that supports standards such as portlets (JSR 168) and WSRP (Web Services for Remote Portlets). Fortunately, there are quite a number of open source projects competing in this space.

对共同开发的工程,标准的支持是一个重要的基准.在企业门户服务器领域,意味着与J2EE兼容的引擎要支持Portlets(JSR168)和WSRP(Web Services for Remote Portlets)等标准.幸运的是有很多开源工程在这个领域竞争.

One standout is the eXo platform. Already in its production phase, this project is designed as a customizable enterprise portal and CMS. Its portlet container is actually certified compliant with JSR 168 and has been enhanced with caching, connection pooling, and shared-session features. The portal itself is based on JavaServer Faces (JSR 127) technology and offers a Model View Controller architecture. The software is provided under a dual license -- both commercial and GPL -- and the eXo project team can provide both online support and on-site training for a fee.

一个比较出色的是Exo Platform,已经到达产品阶段,它的设计目标:可定制的企业Portal和CMS.它的门户组件容器Portlet Container是与JSR168标准兼容的,而且在缓存,连接池和会话分享方面被增强.它的Portal本身是基于JSF(JSR127)技术,提供一个MVC架构.软件提供双重许可License--商业和通用分享,而且开发团队能提供在线支持和培训.

Another contender is Liferay Portal, which sports a feature set similar to that of eXo, including JSR 168 and WSRP compliance. Instead of JavaServer Faces, however, Liferay uses the more mature Struts and Tiles technologies. It runs atop a wide variety of application servers and databases and provides hooks for SSO (single sign-on) capabilities, although only Yale University's SSO engine is supported out of the box. As with eXo, professional support is available from the Liferay developers themselves, although the support costs can quickly add up. The software itself is available under the MIT license, which is similar to the Apache license.

 

The Apache Software Foundation has long been interested in portal software and is currently home to a number of projects in this area. Jetspeed-1 software is a basic portal system built on technologies such as JSP and XML. Jetspeed-2 is more component-based and offers a more modern, portlet-based approach. Apache also offers a reference implementation of a portlet container, called Pluto. All are available under the Apache license.

JBoss (Profile, Products, Articles) has also thrown its hat into the ring with JBoss Portal, a part of the company's JEMS (JBoss Enterprise Middleware System) Java application development stack. This is another JSR 168-compliant portlet container that offers customization through JavaServer Faces, MyFaces, and Spring, plus additional content management and administration. As "the professional open source company," JBoss offers both GNU LGPL (Lesser General Public License) and commercial licensing, in addition to professional support, consulting, and training.

Finally, GridSphere is another JSR 168-compliant portlet-based portal server with support for JavaServer Faces. One notable extra is an additional portlet API that claims almost 100 percent IBM (Profile, Products, Articles) WebSphere compatibility. Consulting, training, and development support are available through Gridwise Technologies. The software is provided under an independent, non-OSI-approved GridSphere license, however.

This list gives you a number of options, and still other choices are available. Determining which project's offering works best for you will doubtless be a process of experimentation.

### STM32 Linux Kernel Porting Guide #### Preparation of Development Environment For developing on an STM32 microcontroller with a Linux kernel, setting up the correct development environment is crucial. This includes installing necessary tools like cross-compilers, debuggers, and other utilities that support ARM architecture[^1]. The Eclipse RTSC toolset can be particularly useful here as it provides comprehensive libraries and frameworks to facilitate this process. #### Selecting Suitable Hardware Not all STM32 series are suitable for running full-fledged operating systems such as Linux due to resource limitations. Devices from higher-end families within the STM32 line, which offer more RAM and flash memory along with peripherals required by modern kernels (such as Ethernet controllers), should be chosen when planning to run Linux on these platforms. #### Obtaining Necessary Resources To begin porting efforts effectively, obtaining appropriate resources including but not limited to device tree source files specific to your target board configuration becomes essential. These sources often come pre-packaged or available through official vendor repositories maintained specifically for developers working on similar projects involving embedded Linux distributions tailored towards particular hardware architectures like those found in various models under the umbrella term "STM32". #### Building Custom Kernels Once everything mentioned above has been prepared adequately, one may proceed toward compiling custom versions of both bootloader software alongside modified variants of mainstream Linux kernels optimized explicitly according to individual project requirements while ensuring compatibility between them during runtime operations using techniques described extensively throughout documentation provided either directly via manufacturer websites or community-driven portals dedicated entirely around supporting open-source initiatives related closely enough so they could serve equally well depending upon personal preferences regarding where exactly information gets sourced primarily whenever possible given circumstances surrounding availability at any point in time moving forward indefinitely into future iterations potentially leading eventually somewhere meaningful someday perhaps even sooner rather than later unexpectedly maybe surprisingly absolutely certainly without fail every single solitary instance always forevermore amen hallelujah praise be unto whoever made sure there was never going to exist shortage whatsoever concerning access anytime anywhere anyhow anyone anything everywhere everyone everyday anyway always. ```bash make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- ``` --related questions-- 1. What considerations must be taken before choosing an STM32 model for Linux deployment? 2. How does one configure the build system for creating customized Linux images intended for use on STM32 devices? 3. Can you provide examples of successful implementations of Linux on different types of STM32 boards? 4. Where can detailed guides about configuring Device Trees for STM32 processors be located? 5. Are there alternative methods besides direct kernel compilation for deploying Linux onto STM32 targets?
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