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POJava REST client without schema
 

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    <h2>Goal</h2> <p>Java client for Yahoo's HotJobs <a href="http://developer.yahoo.com/hotjobs/resume_search_user_guide/index.html" rel="nofollow noreferrer">Resumé Search REST API</a>. </p> <h2>Background</h2> <p>I'm used to writing web-service clients for SOAP APIs, where <a href="https://jax-ws.dev.java.net/jax-ws-ea3/docs/wsimport.html" rel="nofollow noreferrer">wsimport</a> generates proxy stubs and you're off and running. But this is a REST API, which is new to me.</p> <h2>Details</h2> <ul> <li><a href="http://en.wikipedia.org/wiki/Representational_State_Transfer" rel="nofollow noreferrer">REST</a> API</li> <li>No <a href="http://en.wikipedia.org/wiki/Web_Application_Description_Language" rel="nofollow noreferrer">WADL</a></li> <li>No formal XML schema (XSD or DTD files). There are <a href="http://developer.yahoo.com/hotjobs/resume_search_user_guide/auth.html" rel="nofollow noreferrer">example XML request/response pairs</a>.</li> <li>No example code provided</li> </ul> <h2>Progress</h2> <p>I looked at question <a href="https://stackoverflow.com/questions/221442/rest-clients-for-java">Rest clients for Java?</a>, but the automated solutions there assume you are providing both the server and the client, with JAXB invoked on POJOs to generate a schema and a REST API.</p> <p>Using <a href="http://jersey.java.net/" rel="nofollow noreferrer">Jersey</a> (a <a href="http://jcp.org/en/jsr/detail?id=311" rel="nofollow noreferrer">JAX-RS</a> implementation), I have been able to make a manual HTTP request:</p> <pre><code>import com.sun.jersey.api.client.*; ... ClientConfig clientConfig = new DefaultClientConfig(); Client client = Client.create(clientConfig); WebResource webResource = client.resource("https://hj.yahooapis.com/v1/HJAuthTokens"); webResource.accept("application/xml"); // body is a hard-coded string, with replacements for the variable bits String response = webResource.post(String.class, body); // parse response into a org.w3c.dom.Document // interface with Document via XPATH, or write my own POJO mappings </code></pre> <p>The response can look like:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;Response&gt; &lt;ResponseCode&gt;0&lt;/ResponseCode&gt; &lt;ResponseMessage&gt;Login successful&lt;/ResponseMessage&gt; &lt;Token&gt;NTlEMTdFNjk3Qjg4NUJBNDA3MkJFOTI3NzJEMTdDNDU7bG9jYWxob3N0LmVnbGJwLmNvcnAueWFob28uY29tO0pVNWpzRGRhN3VhSS4yQVRqRi4wWE5jTWl0RHVVYzQyX3luYWd1TjIxaGx6U0lhTXN3LS07NjY2MzM1OzIzNDY3NTsxMjA5MDE2OTE5OzZCM1RBMVNudHdLbl9VdFFKMFEydWctLQ==&lt;/Token&gt; &lt;/Response&gt; </code></pre> <p>Or, it can look like:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;yahoo:error xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" xml:lang="en-US"&gt; &lt;yahoo:description&gt;description&lt;/yahoo:description&gt; &lt;yahoo:detail&gt; &lt;ErrorCode&gt;errorCode&lt;/ErrorCode&gt; &lt;/yahoo:detail&gt; &lt;/yahoo:error&gt; </code></pre> <h2>Questions</h2> <ul> <li>Is there a way to auto-generate <a href="http://en.wikipedia.org/wiki/POJO" rel="nofollow noreferrer">POJOs</a> which can be marshalled/unmarshalled without a formal schema? </li> <li>Should I attempt to generate those POJOs by hand, with <a href="http://jaxb.java.net/" rel="nofollow noreferrer">JAXB</a> annotations?</li> <li><strong><em>Is there some tool I should be leveraging so I don't have to do all this manually?</em></strong></li> </ul>
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