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copied!<p>I Finally got the output!!!!</p> <p>Updated code is:</p> <pre><code>package com.voxmobili.sng.cnx.gmail.sync; import java.io.FileInputStream; import java.io.IOException; import java.security.InvalidKeyException; import java.security.KeyStore; import java.security.KeyStoreException; import java.security.NoSuchAlgorithmException; import java.security.PrivateKey; import java.security.Signature; import java.security.SignatureException; import java.security.UnrecoverableKeyException; import java.security.cert.CertificateException; import org.apache.commons.codec.binary.Base64; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpException; import org.apache.commons.httpclient.methods.PostMethod; import org.json.JSONException; import org.json.JSONObject; public class GoogleServiceAccount<E> { static String keyAlias = "privatekey"; public static byte[] signData(byte[] data, PrivateKey privateKey) throws InvalidKeyException, SignatureException, NoSuchAlgorithmException { Signature signature = Signature.getInstance("SHA256withRSA"); signature.initSign(privateKey); signature.update(data); return signature.sign(); } public static String encodeBase64(byte[] rawData) { byte[] data = Base64.encodeBase64(rawData); return data.toString(); } private static PrivateKey getPrivateKey(String keyFile, String password) throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException, UnrecoverableKeyException { KeyStore keystore = KeyStore.getInstance("PKCS12"); keystore.load(new FileInputStream(keyFile), password.toCharArray()); PrivateKey privateKey = (PrivateKey) keystore.getKey(keyAlias, password.toCharArray()); return privateKey; } public static void main(String[] args) throws InvalidKeyException, SignatureException, NoSuchAlgorithmException, UnrecoverableKeyException, KeyStoreException, CertificateException, IOException { String keystoreLoc = "C:/Users/xyz/Downloads/b5b400df17628d8.p12"; String password = "notasecret"; String jwtHeaderStr=null; String jwtClaimStr=null; PrivateKey privateKey=null; //JWT HEADER JSONObject jwtHeader=new JSONObject(); try { jwtHeader.put("alg","RS256"); jwtHeader.put("typ","JWT"); jwtHeaderStr= jwtHeader.toString(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } byte[] encodedHeader = Base64.encodeBase64(jwtHeaderStr.getBytes("UTF-8")); System.out.println("Original HEaderString: " + jwtHeaderStr ); System.out.println("Base64 Encoded HeaderString : " + new String(encodedHeader)); //JWT CLAIMSET JSONObject jwtClaimSet= new JSONObject(); long iat = (System.currentTimeMillis()/1000)-60; long exp = iat + 3600; try { jwtClaimSet.put("iss", "4459@developer.gserviceaccount.com"); jwtClaimSet.put("scope", "https://www.googleapis.com/auth/calendar.readonly"); jwtClaimSet.put("aud", "https://accounts.google.com/o/oauth2/token"); jwtClaimSet.put("exp", +exp); jwtClaimSet.put("iat",+iat); jwtClaimStr=jwtClaimSet.toString(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } byte[] encodedClaimSet=Base64.encodeBase64(jwtClaimStr.getBytes("UTF-8")); System.out.println("Original ClaimSet String:"+jwtClaimStr); System.out.println("Base64 Encoded ClaimSet:"+ new String(encodedClaimSet) ); StringBuffer token = new StringBuffer(); token.append(new String(encodedHeader)); token.append("."); token.append(new String(encodedClaimSet)); //JWT SIGNATURE privateKey= getPrivateKey(keystoreLoc, password); byte[] sig = signData(token.toString().getBytes("UTF-8"), privateKey); byte[] encodedSig=Base64.encodeBase64(sig); System.out.println("Signature before encoding:"+ new String(encodedSig)); String signedPayload =encodeBase64(sig); //System.out.println("Signature before encoding:"+signedPayload); token.append("."); //token.append(signedPayload); token.append(new String(encodedSig)); HttpClient client = new HttpClient(); PostMethod method = new PostMethod("https://accounts.google.com/o/oauth2/token"); method.addRequestHeader("Content-Type", "application/x-www-form-urlencoded"); method.addParameter("grant_type","urn:ietf:params:oauth:grant-type:jwt-bearer"); System.out.println("printing Token.toString():"+token.toString()); method.addParameter("assertion",token.toString()); try { int responseCode=client.executeMethod(method); System.out.println(responseCode); System.out.println(method.getResponseBodyAsString()); System.out.println(method.getURI()); } catch (HttpException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } </code></pre>

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