Lucene until version 2.9.x has the following minimum requirements (for later versions, see the corresponding per-release documentation):

• Java 1.4.x or greater.
• ANT 1.6.3 or greater.
• JUnit 3.8.2 if you wish to run the unit tests.
• CPU, Disk and Memory requirements are based on the many choices made in implementing Lucene (document size, number of documents, and number of hits retrieved to name a few.) The benchmarks page has some information related to performance on particular platforms. Also, the Contrib/benchmark module has code related to benchmarking a standard set of documents.

Contrib modules may have other requirements, refer to their documentation and build files for information.