Java Search Engine can be used as a server side search engine for web sites by any java application. This has a similar query language and output interface as Google. You can install this as a standalone server and return results as XML. As this provides a complete solution, there is no requirement of creating a crawler for it or having to install or integrate it with any database if you don't want. Also it does not require any other additional software except JDK. This can be completely integrated into any site architecture using XML.
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