The OSS/J APIs are multi-technology based and include Java, XML, and Web Services integration profiles. Each integration profile consists of specifications, a reference implementation, and a conformance test suite (TCK).

The OSS/J APIs have been grouped in different sets: each set lists APIs that have in common specific features.  

• SOA Enablement OSS/J APIs
  These APIs are designed to facilitate the deployment of SOA-ready environments
  
  
• Other OSS/J APIs
  These are other final or proposed final APIs
  
  
• Older Versions of OSS/J APIs
  These are older versions of some of the APIs listed above
  
  
• OSS/J Developer Guidelines 
  Background information necessary for the development of OSS/J-compliant applications.