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XML, XSLT, Java, and JSP: A Case Study in Developing a Web Application- P3: Là một nhà phát triển Web, bạn biết những thách thức trong việc xây dựng các ứng dụng mạnh mẽ trên nhiều nền tảng. Tạo các ứng dụng di động trở nên thật sự có thể bằng cách sử dụng Java cho code và XML để tổ chức và quản lý dữ liệu. "XML, XSLT, Java, và JSP: Một trường hợp học" sẽ giúp bạn tối đa hóa khả năng của XML, XSLT, Java, và JSP trong các ứng dụng web của bạn | 82 Chapter 5 bonForum Chat Application Use and Design have a slow connection to the Internet.You will not be able to run this version of the bonForum Web chat without having the Sun Java plug-in available. For more on that see Chapter 9 Java Applet Plugged In BonForumRobot. Non-Applet Version of bonForum Some people have objected to the use of an applet in bonForum and would rather see a purely server-side chat solution. That would require replacing our applet-based mechanism for refreshing user interface content chat messages and so on with different mechanisms that are not based upon an applet. In fact our first version of bonForum did work without an applet using the refresh Pragma but the flashing of the refresh bothered us so we went to the BonForumRobot applet solution. 5.1.7 Frames and Tables Required The browser that you use to enter bonForum must be capable of displaying HTML tables and frames. Again we certify bonForum use only with the IE5.X browsers in which that is not a problem. It would be possible to have a version of bonForum that does not require tables or frames. In fact we also began the project without either tables or frames but we found the results to be less than satisfactory. 5.1.8 Problems Running bonForum Perhaps the most common problem encountered while trying to install and run a new Java application is that it throws the java.lang.NoClassDefFoundError exception. If you did not tell Tomcat where to find the Apache Xerces XML package correctly for example you will not get far into bonForum before you encounter such an exception. Such exceptions should be politely shown to the user on an error page and Tomcat has a facility for doing that. We did not add polite error handling to bonForum yet so you will get the following rude message on your browser instead Error 500 Location bonForurn servlet BonForurnEngine Internal Servlet Error java.lang.NoClassDefFoundError org apache xerces frarnework XMLParser at java.lang.Class.newInstance0 Native
