When building Web applications with the Google Web Toolkit, using Berkeley DB Java Edition as a persistent data store can reduce project costs significantly.

Many developers have asked how to use GWT and Hibernate together. Although you can find numerous discussions about this topic on the GWT Developer Forum, we thought it would be beneficial to sum up some of the most popular strategies, and highlight their advantages and shortcomings in the context of GWT application development.

In this Mastering Grails installment, Scott Davis explores the various ways that Grails can use database tables that don't conform to the Grails naming standard. If you have Java™ classes that already map to your legacy databases, Grails allows you to use them unchanged. You'll see examples that use Hibernate HBM files and Enterprise JavaBeans 3 annotations with legacy Java classes.

Ten fundamental prescriptions and proscriptions to help you be more successful in your database development endeavors.

If you're a Java™ 2 Enterprise Edition (J2EE) developer, you'll want to preview the SQLXML technology. Check out procedures to create an XML document, store an XML document in a relational database, retrieve an XML document from a database, and navigate an XML document with the SQLXML Java data type.

When it comes to embedded systems and mobile devices, developers face a very important choice between flat files and an embedded database, as any future change can be very risky and expensive. However, to meet deadlines and satisfy hardware restrictions, many developers build custom solutions from scratch, preferring a quick, simple implementation to a scalable one. As the product line evolves, these solutions can become very complex and difficult to reconcile with new requirements.

Here we examine data persistence patterns to help you determine which best suits your needs. We look at a number of patterns, including the Active Record, the Data Mapper, the Repository, the Identity Map, the Lazy Loading, and the Virtual Proxy.

Processing XML in Java usually requires a lot of code and overhead. If you use XQuery, you can do a lot more with a lot less code, even when the XML is stored outside of XML databases. Learn how to use XQuery with Java technology by extracting the hidden information from XML-based Maven POM files.

The Persevere persistent object framework brings persistent object mapping to the browser JavaScript environment. Object persistence has seen great popularity in the Java™ programming and Ruby worlds, and the dynamic JavaScript language is naturally well suited to mapping objects to persisted data. Persevere automates mapping and communication in Asynchronous JavaScript + XML (Ajax)-based Web applications in addition to simplifying much of the development challenge by providing a manageable data model, transparent client-server Ajax interchanges, automatic state change storage, and implicit transaction management.

People love Ajax applications so much that they are willing to use them instead of their desktop equivalents. The only problem occurs when they fail to have network access. This is when an offline feature is necessary. Apache Derby is a great option for enabling offline access to Ajax-powered applications. Learn how to use Apache Derby as a local data store that can be used to take your Ajax application offline.