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While several third-party projects (e.g. GNU Classpath and Apache Harmony) created free software partial Java implementations, the large size of the Sun libraries combined with the use of clean room methods meant that their implementations of the Java libraries (the compiler and VM are comparatively small and well defined) were incomplete and not fully compatible. These implementations also tended to be far less optimized than Sun's.

Sun announced in JavaOne 2006 that Java would become free and open-source software,cite-ref-87[87] and on October 25, 2006, at the Oracle OpenWorld conference, Jonathan I. Schwartz said that the company was set to announce the release of the core Java Platform as free and open source software within 30 to 60 days.cite-ref-88[88]

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