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I am looking for an OLAP implementation, which could be embedded in a java application. The best — but not necessarily — if I could use olap4j to connect to it. I need such a library for testing purposes of my application to evaluate ideas before go for a standalone OLAP server.
Mondrian seems to be the perfect solution. It is implemented in pure Java, it is embeddable, and its native interface is olap4j. If you need a database to be embedded also, use an embedded Java database such as apache derby or hsqldb.