title: com.fasterxml.jackson.core.JsonParseException: Unexpected character
body: <p>I'm building REST API with Java (JAX-RS) using <a href="http://jersey.java.net/" rel="nofollow">Jersey</a> and I use Jackson as a JSON processor. While I try to post json data to the service I get the following error:</p>
  
  <pre><code>Sep 17, 2012 9:43:35 PM com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException
  SEVERE: The exception contained within MappableContainerException could not be mapped to a response, re-throwing to the HTTP container
  com.fasterxml.jackson.core.JsonParseException: Unexpected character ('h' (code 104)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
   at [Source: org.mortbay.jetty.HttpParser$Input@549b6976; line: 1, column: 2]
      at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1284)
      at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:588)
      at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:509)
      at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._handleUnexpectedValue(UTF8StreamJsonParser.java:2094)
      at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._nextTokenNotInObject(UTF8StreamJsonParser.java:612)
      at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.nextToken(UTF8StreamJsonParser.java:498)
      at com.fasterxml.jackson.databind.ObjectReader._initForReading(ObjectReader.java:997)
      at com.fasterxml.jackson.databind.ObjectReader._bind(ObjectReader.java:883)
      at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:471)
      at com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider.readFrom(JacksonJsonProvider.java:443)
      at com.sun.jersey.spi.container.ContainerRequest.getEntity(ContainerRequest.java:483)
      at com.sun.jersey.server.impl.model.method.dispatch.EntityParamDispatchProvider$EntityInjectable.getValue(EntityParamDispatchProvider.java:123)
      at com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:46)
      at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153)
      at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203)
      at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
      at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
      at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
      at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
      at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
      at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1480)
      at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1411)
      at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1360)
      at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1350)
      at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
      at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
      at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:278)
      at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:268)
      at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:180)
      at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:93)
      at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)
      at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:59)
      at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
      at quotes.auth.BraceletFilter.doFilter(BraceletFilter.java:58)
      at quotes.util.AbstractFilter.doFilter(AbstractFilter.java:48)
      at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
      at com.google.appengine.tools.appstats.AppstatsFilter.doFilter(AppstatsFilter.java:141)
      at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
      at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:59)
      at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:49)
      at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
      at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120)
      at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:132)
      at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:129)
      at com.google.inject.servlet.GuiceFilter$Context.call(GuiceFilter.java:206)
      at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:129)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
      at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94)
      at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:370)
      at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at org.mortbay.jetty.Server.handle(Server.java:326)
      at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
      at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
      at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
      at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
      at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
      at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
      at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
  </code></pre>
  
  <p>Here is the json data that I try to post:</p>
  
  <pre><code>{"id":null,"name":"Jack"}
  </code></pre>
  
  <p>Any idea to solve this problem? Thanks in advance.</p>
  
  <p><strong>EDIT:</strong></p>
  
  <p>Here is the POST method:</p>
  
  <pre><code>@POST
  @Consumes(MediaType.APPLICATION_JSON)
  public Response createModelInstance(Category model, @Context UriInfo uriInfo) {
  
      ofy().save().entity(model);
      URI uri = uriInfo.getAbsolutePathBuilder().clone().path(model.getId().toString()).build();
      Response response = Response.created(uri).build();
  
      return response;
  }
  </code></pre>
  
  <p>And here is <code>Category</code> model :</p>
  
  <pre><code>@Entity
  @NoArgsConstructor
  public class Category {
  
      @Getter
      @Id
      Long id;
  
      @Getter
      @Setter
      String name;
  
      public Category(String name) {
          this.name = name;
      }
  }
  </code></pre>