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his book is about Apache log4j, the most popular Java-based logging API available in the market. This book deals with the concept of building a flexible and robust application logging framework for Java-based applications and is an in-depth guide to the use of Apache log4j 1.2.9 with an emphasis on the following: Understanding the internals of the log4j API and how they work Working with the extremely useful, robust logging features available in log4j Extending the existing log4j framework for certain specialized application-specific requirements In recent times, software applications have become more complex and distributed in nature. Time has become the most crucial factor in delivering and supporting any application. Proper logging makes it many times easier to identify and locate problems within applications. Thus, logging is critical to the overall success of any application measured against the maintainability and supportability of the application. The pursuit of a solid logging framework leads to Apache log4j.

Overriding the virtual members from ReportFramework is a fairly painless process because the Visual Studio IDE creates the member definitions for you On top of that, many of the members only require one line of code, so you can begin to appreciate how easy it is to create reports using a reporting framework The first overridden method is SearchFormFileName This method returns the file name of the ISearchControl component to the LoadSearchForm method in the ReportFramework class Remember, the LoadSearchForm method uses the file name provided by SearchFormFileName to load the search form into the Report Page You can see that SearchFormFileName uses the SearchFormIndex to determine which ISearchControl component file name to return If the SearchFormIndex is 0, it returns the file name for the simple search form Otherwise, it returns the file name for the advanced search form.

Start Eclipse Galileo and select Help Check for Updates, as shown in Figure 1-3.

This, along with the toggling functionality used to set the SearchFormIndex, is all you need to toggle between ISearchControl components The next six overridden methods are all one-liners that return a specific value or control reference PaginationFormFileName returns a string containing the file name of the IPagination Control to load into the page If you want to allow your users to select a different paging navigation form based on a profile setting or some other value, then you ll need to account for that setting in this method SearchFormPH returns a reference to the PlaceHolder control where you want to display your ISearchControl component If you do not want to use an ISearchControl component on the Report Page, then return Nothing as the value of this method Also remember to override the GetSqlQuery method because it relies on the ISearchControl component to acquire the search query for the report.

PaginationFormPH returns a reference to the PlaceHolder control where you want to display your IPaginationControl component If you do not want to use pagination, then return Nothing as the value of this method and the ReportFramework will not use pagination ReportGrid returns a reference to the GridView control where the ReportFramework outputs the report data This is a required control Returning Nothing as the value of this method causes an exception to be thrown ConnectionStringKey returns the key associated with the connection string that you want to use to connect the Report Page to the database If the key is invalid, or the key points to an invalid connection string, it causes an exception to be thrown..

Log4j accepts three separate virtual machine (VM) parameters in the initialization process. They are as follows: log4j.configuration: Specifies the log4j configuration file. log4j.configurationClass: Specifies any customized initialization class to use instead of the default configuration class LogManager in log4j. log4j:defaultInitOverride: Overrides the default initialization process. If set to true, the default log4j initialization process is no longer valid. If set to false, the log4j default initialization process continues following the values specified for the VM parameters already outlined. log4j.debug: Variable that indicates whether the log4j internal logging should be enabled. It is sometimes useful to see how log4j is initializing itself.