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Revision as of 10:04, 27 February 2012


What is OSLC4J

OSLC4J is a Java toolkit for building Open Services for Lifecycle Collaboration providers and consumers. It includes:

  • annotations to decorate Java objects with OSLC attributes
  • annotations to assist with resource preview UIs (compact rendering)
  • built-in support for service provider and resource shape documents
  • libraries to simplify service provider and consumer development
  • sample applications, including an OSLC Registry (catalog) application and a Change Management provider implementation
  • Tests for the sample applications to complement the Lyo OSLC Test Suite


  • OSLC4J - The core component providing OSLC annotation and model support
  • Apache Jena Provider - A library to assist with serialization/de-serialization of OSLC-annotated Java objects to/from RDF XML.
  • Apache Wink Json4J Provider - A library to assist with serialization/de-serialization of OSLC-annotated Java objects to/from JSON.
  • Apache Wink JAX-RS Provider - Utility classes, including an OSLC REST Client, to facilitate development using the Apache Wink JAX-RS implementation.

The Apache Jena and Apache Wink components are the built-in providers for RDF, RDF XML, JSON and JAX-RS. Additional providers could be implemented using technologies such as OpenRDF and Jersey.

Sample code

Annotation sample

   //sample simple string attribute (dcterms:description)
   @OslcDescription("Descriptive text (reference: Dublin Core) about resource represented as rich text in XHTML content.")
   @OslcPropertyDefinition(OslcConstants.DCTERMS_NAMESPACE + "description")
   public String getDescription()
       return description;
   //sample relationship attribute (oslc_cm:affectsTestResult)
   @OslcDescription("Associated QM resource that is affected by this Change Request.")
   @OslcPropertyDefinition(Constants.CHANGE_MANAGEMENT_NAMESPACE + "affectsTestResult")
   @OslcTitle("Affects Test Results")
   public URI[] getAffectsTestResults()
       return affectsTestResults.toArray(new URI[affectsTestResults.size()]);

JAX-RS method sample

   //support GET for a specific OSLC ChangeRequest
   @Produces({OslcMediaType.APPLICATION_RDF_XML, OslcMediaType.APPLICATION_XML, OslcMediaType.APPLICATION_JSON})
   public ChangeRequest getChangeRequest(@Context                      final HttpServletResponse httpServletResponse,
                                         @PathParam("changeRequestId") final String              changeRequestId)
       final ChangeRequest changeRequest = Persistence.getChangeRequest(changeRequestId);
       if (changeRequest != null)
           setETagHeader(getETagFromChangeRequest(changeRequest), httpServletResponse);
           return changeRequest;
       throw new WebApplicationException(Status.NOT_FOUND);
   //support POST to create a new ChangeRequest
   @Consumes({OslcMediaType.APPLICATION_RDF_XML, OslcMediaType.APPLICATION_XML, OslcMediaType.APPLICATION_JSON})
   @Produces({OslcMediaType.APPLICATION_RDF_XML, OslcMediaType.APPLICATION_XML, OslcMediaType.APPLICATION_JSON})
   public Response addChangeRequest(@Context final HttpServletRequest  httpServletRequest,
   		                         @Context final HttpServletResponse httpServletResponse,
                                             final ChangeRequest       changeRequest)
          throws URISyntaxException
       final long identifier = Persistence.getNextIdentifier();
       final URI about = new URI(httpServletRequest.getScheme(),
                                 httpServletRequest.getContextPath() + "/changeRequests/" + identifier,
       final Date date = new Date();
       setETagHeader(getETagFromChangeRequest(changeRequest), httpServletResponse);
       return Response.created(about).entity(changeRequest).build();

Getting started with OSLC4J

  • The Lyo OSLC4J project is currently provided as source code. We're working on getting jars built by the Eclipse build infrastructure
  • See Setting up OSLC4J for information on setting up a development environment.

Copyright © Eclipse Foundation, Inc. All Rights Reserved.