title: Unexpected character ('F' (code 70)): expected a valid value (number, String, array, object, 'true', 'false' or 'null') What does it mean?
body: <p>I am trying to access a url using rest client</p>
  
  <p>My Client Code:</p>
  
  <pre><code> public class ProductByListTestClient {
  
  //  private final String USER_AGENT = "Mozilla/5.0";
  
  public static void main(String[] args) {
  
      ProductByListTestClient http = new ProductByListTestClient();
      try {
          http.sendPost();
      } catch (Exception e) {
          e.printStackTrace();
      }
  }
  
  // HTTP POST request
  private void sendPost() throws Exception {
  
      String url = "http://localhost:7111/product.lookup.tobuylist/rest/product/productbuylist";
      URL obj = new URL(url);
      HttpURLConnection con = (HttpURLConnection) obj.openConnection();
      con.setRequestMethod("POST");
      con.setDoOutput(true);
     // con.setRequestProperty("User-Agent", USER_AGENT);
      con.setRequestProperty("Accept", "application/json");
      con.setRequestProperty("Content-Type", "application/json");
      String urlParameters = "{\"itemID\":F123}";
  
      // Send post request
      con.setDoOutput(true);
      DataOutputStream wr = new DataOutputStream(con.getOutputStream());
      wr.writeBytes(urlParameters);
      wr.flush();
      wr.close();
  
      int responseCode = con.getResponseCode();
      System.out.println("\nSending 'POST' request to URL : " + url);
      System.out.println("Post parameters : " + urlParameters);
      System.out.println("Response Code : " + responseCode);
  
      BufferedReader in = new BufferedReader(new InputStreamReader(
              con.getInputStream()));
      String inputLine;
      StringBuffer response = new StringBuffer();
  
      while ((inputLine = in.readLine()) != null) {
          response.append(inputLine);
      }
      in.close();
  
      // print result
      System.out.println(response.toString());
  
  }
  </code></pre>
  
  <p>}</p>
  
  <p>Root cause of <code>ServletException</code>:</p>
  
  <pre class="lang-none prettyprint-override"><code>org.codehaus.jackson.JsonParseException: Unexpected character ('F' (code 70)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
   at [Source: weblogic.servlet.internal.ServletInputStreamImpl@186948; line: 1, column: 12]
      at org.codehaus.jackson.JsonParser._constructError(JsonParser.java:1432)
      at org.codehaus.jackson.impl.JsonParserMinimalBase._reportError(JsonParserMinimalBase.java:385)
      at org.codehaus.jackson.impl.JsonParserMinimalBase._reportUnexpectedChar(JsonParserMinimalBase.java:306)
      at org.codehaus.jackson.impl.Utf8StreamParser._handleUnexpectedValue(Utf8StreamParser.java:2084)
      at org.codehaus.jackson.impl.Utf8StreamParser.nextToken(Utf8StreamParser.java:549)
      Truncated. see log file for complete stacktrace
  </code></pre>