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Asked: 2026-05-27T10:49:52+00:00

I’m trying to get my head around some concepts in Java: JSR(s): describe specifications,

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I’m trying to get my head around some concepts in Java:

  1. JSR(s): describe specifications, but carry no actual implementations. E.g. http://jsr311.java.net/ is the “home” for “Java™ API for RESTful Web Services”. It serves as a common reference for all implementations of JSR-311.
  2. One can download the interfaces (?) of JSR-311 from http://mvnrepository.com/artifact/javax.ws.rs/jsr311-api, however, unless you are implementing JSR-311 by yourself these have no particular value?
  3. JSR(s) will usually/always have a reference implementation. To find it you’ll have to google “JSR XXX reference implementation” or see the specifications home page (e.g. http://jsr311.java.net/)
  4. For JSR-311 this reference implementation is Jersey. Using maven you can get the jersey server from http://mvnrepository.com/artifact/com.sun.jersey/jersey-server/1.9. Since
    Jersey provides an implementation according to the interfaces found in http://mvnrepository.com/artifact/javax.ws.rs/jsr311-api, you only need to add Jersey as a dependency in your project and not the jsr311-api itself. (this applies to all JSR technologies?)
  5. Putting both http://mvnrepository.com/artifact/javax.ws.rs/jsr311-api and http://mvnrepository.com/artifact/com.sun.jersey/jersey-server/1.9 as dependencies in your project will possibly cause classpath problems?

Am I completely off or onto someting?

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1 Answer

  1. Editorial Team

    1. Yes, this isn’t anything new. Think about JDBC, java provides the
      interfaces (Connection, Statement, ResultSet etc) but it is up
      to database vendors to provide implementations.

    2. If you’re using a JSR-311 implementation like Jersey or Apache CXF
      then you’ll annotate your classes with the javax.ws.rs annotations, such as @Path, @GET, @Produces etc. This is why you need to explicitly have JSR-311 as a maven dependency.

    3. Yes, usually. Have a look at the JSR list on wiki.

    4. You need both the JSR and the implementation. The annotations are in the JSR, the implementation provides supporting classes, such as com.sun.jersey.spi.container.servlet.ServletContainer.

    5. No, it is necessary to have both as dependencies (see point 4); you won’t get classpath conflicts.

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