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POJackson provider not deserializing POST data into Pojo (Jersey 2.0)
 

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    <p>I am using Jackson json provider with Jersey 2.0. I have a Web resource like this:</p> <pre><code>@Path("/accesstokens") public class AccessTokensService { @POST @Consumes(MediaType.APPLICATION_JSON) @Produces(MediaType.APPLICATION_JSON) public Response generate(UserCredentials creds) { System.out.println("In generate method.."); System.out.println(creds); try { // Authenticate .. generate token .. return Response.ok(token, MediaType.APPLICATION_JSON).build(); } catch (Exception e) { e.printStackTrace(); return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build(); } } } </code></pre> <p>The UserCredentials Pojo class is as follows:</p> <pre><code>public class UserCredentials { private String username; private String password; private String ipAddress; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getIpAddress() { return ipAddress; } public void setIpAddress(String ipAddress) { this.ipAddress = ipAddress; } } </code></pre> <p>Here is the relevant snippet from web.xml:</p> <pre><code>&lt;servlet&gt; &lt;servlet-name&gt;jersey-rest-service&lt;/servlet-name&gt; &lt;servlet-class&gt;org.glassfish.jersey.servlet.ServletContainer&lt;/servlet-class&gt; &lt;init-param&gt; &lt;param-name&gt;com.sun.jersey.api.json.POJOMappingFeature&lt;/param-name&gt; &lt;param-value&gt;true&lt;/param-value&gt; &lt;/init-param&gt; &lt;init-param&gt; &lt;param-name&gt;jersey.config.server.provider.packages&lt;/param-name&gt; &lt;param-value&gt;com.xxxxx.apps.ws.services;com.fasterxml.jackson.jaxrs.json;com.xxxxxx.apps.servlet;com.xxxxxx.apps.ws.filters&lt;/param-value&gt; &lt;/init-param&gt; &lt;init-param&gt; &lt;param-name&gt;com.sun.jersey.spi.container.ContainerRequestFilters&lt;/param-name&gt; &lt;param-value&gt;com.xxxxxx.apps.ws.filters.LoggingFilter&lt;/param-value&gt; &lt;/init-param&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; </code></pre> <p>Here is how the POST entity data looks like:</p> <pre><code>{"username":"xxxxx", "password":"xxxxxx", "ipAddress": "xxx.xxx.xxx.xxx"} </code></pre> <p>Unfortunately, the Jackson provider does not deserialize the above JSON. A null UserCredentials object is injected into the above Web resource POST method. If I use a custom MessageBodyReader, my Reader's readFrom method is invoked and I am able to create the UserCredentials pojo which is then available in the POST method.</p> <p>A couple of questions:</p> <p>1) Do I need to do any special annotation on the Pojo for Jackson to recognize it? Does the Pojo's package need to be added in web.xml?</p> <p>2) Is this property in web.xml relevant anymore: "com.sun.jersey.api.json.POJOMappingFeature" ?</p> <p>3) Do I need to add an ObjectMapper? I think it needs to be done only for custom cases, but please advise.</p> <p>3) Any other gotchas?? Is there a way to debug code in Jackson?</p> <p>Thanks.</p>
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