400 code error

Hi, I get 400 error code. I have the sample code below:package RestAPI; import java.io.BufferedReader; import java.io.File; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.nio.file.Files; import esignLiv.com.Utility; public class SimpleCreateAndSendREST { public static void main(String[] args) throws MalformedURLException, IOException { //System.setProperty("javax.net.ssl.trustStore","C:/Users/pl29158/myprojects/meao/srv/config/cacerts"); String requestURL = Utility.BASE_URL; String apiKey = Utility.API_KEY; String charset = "UTF-8"; File uploadFile1 = new File("C:/Users/pl29158/doc/sample_file2.pdf"); String boundary = Long.toHexString(System.currentTimeMillis()); // Generate a random value for the form boundary String CRLF = "\r\n"; // Line separator used in multipart/form-data. String jsonContent = "{\"roles\":[{\"locked\":false,\"emailMessage\":{\"content\":\"\"},\"attachmentRequirements\":[],\"reassign\":false,\"specialTypes\":[],\"id\":\"Sender\",\"data\":null,\"type\":\"SIGNER\",\"index\":0,\"signers\":[{\"auth\":{\"challenges\":[],\"scheme\":\"NONE\"},\"company\":\"Silanis\",\"firstName\":\"Nuru\",\"lastName\":\"Jaman\",\"phone\":\"\",\"email\":\"[email protected]\",\"knowledgeBasedAuthentication\":null,\"language\":\"en\",\"title\":\"Silanis\",\"external\":null,\"professionalIdentityFields\":[],\"userCustomFields\":[],\"delivery\":{\"email\":true,\"provider\":false,\"download\":true},\"group\":null,\"signature\":null,\"address\":null,\"data\":null,\"name\":\"\",\"specialTypes\":[]}],\"name\":\"Sender\"},{\"locked\":false,\"emailMessage\":{\"content\":\"\"},\"attachmentRequirements\":[],\"reassign\":false,\"specialTypes\":[],\"id\":\"Signer\",\"data\":null,\"type\":\"SIGNER\",\"index\":0,\"signers\":[{\"auth\":{\"challenges\":[],\"scheme\":\"NONE\"},\"company\":\"PNC\",\"firstName\":\"Nayan\",\"SignerLast\":\"Silanis\",\"phone\":\"\",\"email\":\"[email protected]\",\"knowledgeBasedAuthentication\":null,\"language\":\"en\",\"title\":\"\",\"external\":null,\"professionalIdentityFields\":[],\"userCustomFields\":[],\"delivery\":{\"email\":false,\"provider\":false,\"download\":false},\"group\":null,\"id\":\"Signer\",\"signature\":null,\"address\":null,\"data\":null,\"name\":\"\",\"specialTypes\":[]}],\"name\":\"Signer\"}],\"documents\": [{\"approvals\":[{\"role\":\"Signer\",\"signed\":null,\"accepted\":null,\"data\":null,\"fields\":[{\"page\":0,\"subtype\":\"FULLNAME\",\"width\":200,\"binding\":null,\"extract\":false,\"extractAnchor\":null,\"left\":175,\"top\":165,\"validation\":null,\"height\":50,\"data\":null,\"type\":\"SIGNATURE\",\"value\":\"\"}],\"name\":\"\"},{\"role\":\"Sender\",\"signed\":null,\"accepted\":null,\"data\":null,\"fields\":[{\"page\":0,\"subtype\":\"FULLNAME\",\"width\":200,\"binding\":null,\"extract\":false,\"extractAnchor\":null,\"left\":550,\"top\":165,\"validation\":null,\"height\":50,\"data\":null,\"type\":\"SIGNATURE\",\"value\":\"\"}],\"name\":\"\"}],\"name\": \"sampleAgreement\"}],\"name\": \"Test Package REST\", \"type\":\"PACKAGE\", \"language\":\"en\", \"emailMessage\":\"\", \"description\":\"New Package\",\"autoComplete\":true,\"status\":\"SENT\"}"; //String jsonContent="{\"name\": \"My Document\",\"type\":\"PACKAGE\",\"language\":\"en\",\"emailMessage\":\"\",\"description\":\"New Package\",\"autocomplete\":true}"; URLConnection connection = new URL(requestURL+"/packages/").openConnection(); connection.setDoOutput(true); connection.setRequestProperty("Accept-Language", "en-US,en;q=0.5"); connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary); connection.setRequestProperty("Authentication", "Required"); connection.setRequestProperty("Authorization", "Basic " + apiKey); connection.setRequestProperty("Accept", "application/json"); OutputStream output = connection.getOutputStream(); PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true); try { // Add pdf file. writer.append("--" + boundary).append(CRLF); writer.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + uploadFile1.getName() + "\"").append(CRLF); writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(uploadFile1.getName())).append(CRLF); writer.append("Content-Transfer-Encoding: application/pdf").append(CRLF); writer.append(CRLF).flush(); Files.copy(uploadFile1.toPath(), output); output.flush(); writer.append(CRLF).flush(); // add json payload writer.append("--" + boundary).append(CRLF); writer.append("Content-Disposition: form-data; name=\"payload\"").append(CRLF); writer.append("Content-Type: application/json; charset=" + charset).append(CRLF); writer.append(CRLF).append(jsonContent).append(CRLF).flush(); // End of multipart/form-data. writer.append("--" + boundary + "--").append(CRLF).flush(); } catch (IOException ex) { System.err.println(ex); } //get and write out response code int responseCode = ((HttpURLConnection) connection).getResponseCode(); System.out.println(responseCode); //get and write out response BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())); String inputLine; StringBuffer response = new StringBuffer(); while ((inputLine = in.readLine()) != null) { response.append(inputLine); } in.close(); //print result System.out.println(response.toString()); } } package esignLiv.com; public class Utility { //sandbox public static String API_KEY = "=="; public static String BASE_URL = "https://sandbox.esignlive.com/api"; //pnc //public static String API_KEY = "=="; //public static String BASE_URL = "https://e-signature-uat.pnc.com/a/api"; } and the error below: 400 Exception in thread "main" java.io.IOException: Server returned HTTP response code: 400 for URL: https://sandbox.esignlive.com/api/packages/ at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1926) at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1921) at java.security.AccessController.doPrivileged(Native Method) at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1920) at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1490) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254) at RestAPI.SimpleCreateAndSendREST.main(SimpleCreateAndSendREST.java:71) Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: https://sandbox.esignlive.com/api/packages/ at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1876) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474) at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338) at RestAPI.SimpleCreateAndSendREST.main(SimpleCreateAndSendREST.java:67)