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The current Session returned by the SessionFactory is the same persistence context that is now scoped to the interceptor wrapping this method (and the rendering of the result page). Refer to your web container s documentation to see how you can enable this filter class as an interceptor for particular URLs; we recommend that you apply it only to URLs that require database access during execution. Otherwise, a database transaction and Hibernate Session is started for every HTTP request on your server. This can potentially exhaust your database connection pool, even if no SQL statements are sent to the database server. You can implement this pattern any way you like, as long as you have the ability to intercept requests and to wrap code around your controller. Many web frameworks offer native interceptors; you should use whatever you find most appealing. The implementation shown here with a servlet filter isn t free of problems. Changes made to objects in the Session are flushed to the database at irregular intervals and finally when the transaction is committed. The transaction commit may occur after the view has been rendered. The problem is the buffer size of the servlet engine: If the contents of the view exceed the buffer size, the buffer may get flushed and the contents sent to the client. The buffer may be flushed many times when the content is rendered, but the first flush also sends the HTTP protocol status code. If the SQL statements on Hibernate flush/commit trigger a constraint violation in the database, the user may already have seen a successful output! You can t change the status code (for example, use a 500 Internal Server Error); it s already been sent to the client (as 200 OK).

Configure, manage, and troubleshoot Internet Explorer security settings. Connect to resources by using Internet Explorer.

A security policy is a combination of settings that affect a computer or a user. Policies that affect a computer also affect any user who logs on to that computer. Policies that affect a user affect that user no matter what computer the user logs on to. In this chapter, you learn how Group Policy and Local Security Policy are applied to a computer running Windows XP Professional. You learn how to configure Local Security Policy and about the various settings that are available for configuration. In this chapter, you also learn how to configure Internet Options in Internet Explorer to view Internet resources and how to enhance security and privacy in Internet Explorer. Lessons in this :

There are several ways to prevent this rare exception: Adjust the buffer size of your servlets, or flush the Session before forwarding/redirecting to the view. Some web frameworks don t immediately fill the response buffer with rendered content they use their own buffer and flush it only with the response after the view has been completely rendered, so we consider this a problem with plain Java servlet programming. Let s continue with the cleanup of the controller and extract the business logic into the business layer.