Hibernate Search brings the power of full text search engines to the persistence domain model by combining Hibernate Core with the capabilities of the Apache Lucene™ search engine.
Full text search engines like Apache Lucene™ are very powerful technologies to add efficient free text search capabilities to applications. However, Lucene suffers several mismatches when dealing with object domain models. Amongst other things indexes have to be kept up to date and mismatches between index structure and domain model as well as query mismatches have to be avoided.
Hibernate Search - JBoss Community
