I'm trying to get into JAX-RS. My project jdk is set to 1.7.03. Does there have to be definitions of annotations for JAX-RS(javax.ws.rs)? If not, where I can find them?
These classes (JSR 311: JAX-RS: The JavaTM API for RESTful Web Services) are not part of the JDK. You need to include appropriate JAR file to your CLASSPATH. You can find the API e.g. in maven repository.
Also check out apache-cxf, jersey (reference implementation), resteasy from JBoss, restlet and few other JAX-RS implementations.