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Yes, any programming language can be used to output data from any source in XML format. There is a growing number of front-ends and back-ends for programming environments and data management environments to automate this. Java is just the most popular one at the moment.
There is a large body of middleware (APIs) written in Java and other languages for managing data either in XML or with XML input or output. There is a suite of Java tutorials (with source code and explanation) available at http://developerlife.com/tutorials/.
Please do not mail the FAQ editor with questions about your Java programming bugs. Ask one of the Java newsgroups instead.