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Easy Learn Java: Programming Articles, Examples and Tips - Page 197


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How can I use the new error-reporting mechanism in JVM?

Go to all tips in General Java

Question: How can I use the new error-reporting mechanism in JVM?

Answer: When the Java Virtual Machine (JVM) detects a crash in native code such as JNI code written by the developer or when the JVM itself crashes, it will print debug information about the crash. This error message normally will include information such as the function name, library name, source-file name and line number at which the error occurred. (Currently, information about file name and line number are available only available on Microsoft Windows platforms.) For an example of a message emitted by the error handler, see JNI Error example.

The information provided by the new error-reporting mechanism will allow developers to more easily and efficiently debug their applications. If an error message indicates a problem in the JVM code itself, it will allow a developer to submit a more accurate and helpful bug report.

Sometimes the error-reporting mechanism won't be able to determine the information that might be helpful in locating the source of a crash. To get the most out of the error handler, developers should be aware of the following guidelines and limitations.

Compile in debug mode

In some circumstances, the error-reporting mechanism won't be able to determine symbol names. The most common reason for this is that the binary code that crashed was not compiled in debug mode and therefore doesn't have symbol tables. Developers should compile their code in debug mode to ensure that it contains the necessary debug information. In Visual Studio, for example, this means choosing "Debug" rather than "Release" as the project's build mode. When using gcc or cc on Linux or on the SolarisTM operating environment, compile using the -g command-line option.

More limitations are described in the article here

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comments? | Printer Friendly Page  Send to a Friend | Score: 5
Posted by jalex on Thursday, April 15, 2004 (00:00:00) (2896 reads)

What are JSP Model 1 and Model 2 architectures?

Go to all tips in JSP, Servlets

Question: What are JSP Model 1 and Model 2 architectures?

Answer: The JSP specification presents two approaches for building web applications using JSP pages: JSP Model 1 and Model 2 architectures. These two models differ in the location where the processing takes place. In Model 1 architecture, the JSP page is responsible for processing requests and sending back replies to clients.

The Model 2 architecture, integrates the use of both servlets and JSP pages. In this mode, JSP pages are used for the presentation layer, and servlets for processing tasks. The servlet acts as a controller responsible for processing requests and creating any beans needed by the JSP page. The controller is also responsible for deciding to which JSP page to forward the request. The JSP page retrieves objects created by the servlet and extracts dynamic content for insertion within a template.
This model promotes the use of the Model View Controller (MVC) architectural style design pattern. Note that several frameworks already exist that implement this useful design pattern, and that truly separate presentation from content. The Apache Struts is a formalized framework for MVC. This framework is best used for complex applications where a single request or form submission can result in substantially different-looking results.
The answer was found in the article "Servlets and JSP Pages Best Practices":
http://developer.java.sun.com/developer/technicalArticles/javaserverpages/servlets_jsp/

If you are going to use Model 2 in your project I advise you to pay attention to Struts - an open source framework for building web applications.
Struts is part of the Apache Jakarta Project, sponsored by the Apache Software Foundation.
The core of the Struts framework is a flexible control layer based on standard technologies like Java Servlets, JavaBeans, ResourceBundles, and Extensible Markup Language (XML), as well as various Jakarta Commons packages. Struts encourages application architectures based on the Model 2 approach, a variation of the classic Model-View-Controller (MVC) design paradigm.

Struts provides its own Controller component and integrates with other technologies to provide the Model and the View. For the Model, Struts can interact with standard data access technologies, like Enterprise Java Beans and JDBC, as well as most any third-party packages, like Hibernate, iBATIS, or Object Relational Bridge. For the View, Struts works well with JavaServer Pages, including JSTL and JSF, as well as Velocity Templates, XSLT, and other presentation systems .

The Struts framework provides the invisible underpinnings every professional web application needs to survive. Struts helps you create an extensible development environment for your application, based on published standards and proven design patterns.
Struts can be taken here: http://jakarta.apache.org/struts/


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13 comments | Printer Friendly Page  Send to a Friend | Score: 3
Posted by jalex on Wednesday, April 14, 2004 (00:00:00) (8098 reads)

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