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Tomcat comes bundled with a read-only JNDI context, which isn t writable from application-level code after the startup of the servlet container. Hibernate can t bind to this context; you have to either use a full context implementation (like the Sun FS context) or disable JNDI binding of the SessionFactory by omitting the session_factory_name property in the configuration.

n the previous chapters, we ve written and generated a lot of code in our Friends Reunion application. In this chapter, we have two aims: To explain techniques that will help you to ensure the code you ve written is free of bugs To look at how to include exception-handling code that is designed to deal with unexpected runtime errors These two topics are often bundled together and confused with one another. That s because, although they are different, they are related. If you can get a good understanding of exception handling, it will help you to write robust code that is capable of dealing with unexpected occurrences. Then, if your application does have a bug, that bug is less likely to cause a horrible failure at runtime, because the exception-handling code will be designed to deal with it gracefully. We ll devote the first part of the chapter to the subject of debugging: The different types of errors and which tools are most suitable for finding and fixing them Alternative techniques for debugging applications without the aid of a debugger (useful when you move your application from the test environment into a live environment) How to use the VS .NET debugger to debug an application In the second part of the chapter, we ll introduce you to the subject of error handling using exceptions: How to catch, throw, and rethrow exceptions How to define your own custom exceptions How to recover gracefully from an unhandled exception How to log exceptions to the System event log

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Keep it simple: Keep maps logically organized. Across maps, ensure that the same look and feel are applied for consistency.

Hibernate (and many other ORM implementations) executes SQL statements asynchronously. An INSERT statement isn t usually executed when the application calls Session.save(); an UPDATE isn t immediately issued when the application calls Item.addBid(). Instead, the SQL statements are usually issued at the end of a transaction. This behavior is called write-behind, as we mentioned earlier. This fact is evidence that tracing and debugging ORM code is sometimes nontrivial. In theory, it s possible for the application to treat Hibernate as a black box and ignore this behavior. Certainly the Hibernate application can t detect this asynchronicity (at least, not without resorting to direct JDBC calls). However, when you find yourself troubleshooting a difficult problem, you need to be able to see exactly what s going on inside Hibernate. Since Hibernate is open source, you can

Note Just because you can create a map using the mapper and functoids doesn t always mean you should. Make

By the end of the chapter, you should have a good understanding of what is offered by the .NET Framework in general, and ASP .NET in particular, in the battle against bugs. You ll also know how the exception-handling mechanism works and how to integrate it with some specific ASP .NET features.

easily step into the Hibernate code. Occasionally, doing so helps a great deal! But, especially in the face of asynchronous behavior, debugging Hibernate can quickly get you lost. You can use logging to get a view of Hibernate s internals. We ve already mentioned the hibernate.show_sql configuration parameter, which is usually the first port of call when troubleshooting. Sometimes the SQL alone is insufficient; in that case, you must dig a little deeper. Hibernate logs all interesting events using Apache commons-logging, a thin abstraction layer that directs output to either Apache log4j (if you put log4j.jar in your classpath) or JDK1.4 logging (if you re running under JDK1.4 or above and log4j isn t present). We recommend log4j, since it s more mature, more popular, and under more active development. To see any output from log4j, you ll need a file named log4j.properties in your classpath (right next to hibernate.properties or hibernate.cfg.xml). This example directs all log messages to the console:

sure that whatever maps you create are simple and maintainable. Highly complex maps with many interlocking functoids can become unwieldy and next to impossible to support. Alternatives to mapping (most notably XSLT) are often very intelligent alternatives.

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