First, the OLAP council's MDAPI (in two versions), then the JOLAP API emerged from Sun's Java Community Process. History is strewn with attempts to create a standard OLAP API. To understand why, it helps to understand the history of OLAP standards. However, creating a standard OLAP API for Java is a contentious issue. You can write an OLAP application in Java for one server (say Mondrian) and easily switch it to another (say Microsoft Analysis Services, accessed via XML for Analysis). olap4j has a similar programming model to JDBC, shares some of its core classes, and has many of the same advantages. In essence, olap4j is to multidimensional data what JDBC is for relational data. Olap4j is an open Java API for building OLAP applications. The OlapDatabaseMetaData interface, and schema result sets.Benefits of a standard Java API for OLAP.
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