# When i use java application to get token （JWT） error **URL:** \ **Category:** API and Webhooks\ **Created:** [March 20, 2020, 1:12pm UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082 "2020-03-20T13:12:56Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![fsx](https://avatars.discourse-cdn.com/v4/letter/f/ba9def/32.png) [@fsx](https://devforum.zoom.us/u/fsx)\ **Post date:** [March 20, 2020, 1:12pm UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/1 "2020-03-20T13:12:56Z")
every time when i use java application to get token （JWT） and i will receive a string like this " i use this string to access [https://api.zoom.us/v2/users?page\_number=1&page\_size=30&status=active](https://api.zoom.us/v2/users?page_number=1&page_size=30&status=active) header is Bearer it return { “code”: 124, “message”: “The Token’s Signature resulted invalid when verified using the Algorithm: HmacSHA256” } who can help me please. ---
**Author:** ![michael\_p.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/michael_p.zoom/32/18105_2.png) [@michael\_p.zoom](https://devforum.zoom.us/u/michael_p.zoom)\ **Post date:** [March 20, 2020, 7:08pm UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/2 "2020-03-20T19:08:41Z")
Hi @fsx, How are you creating the JWT token? Did you use one of the support [jwt.io](http://jwt.io) java libraries? You can use these guides below. 1 - [https://marketplace.zoom.us/docs/guides/authorization/jwt](https://marketplace.zoom.us/docs/guides/authorization/jwt) 2 - [https://marketplace.zoom.us/docs/guides/authorization/jwt/jwt-with-zoom](https://marketplace.zoom.us/docs/guides/authorization/jwt/jwt-with-zoom) Thanks ---
**Author:** ![fsx](https://avatars.discourse-cdn.com/v4/letter/f/ba9def/32.png) [@fsx](https://devforum.zoom.us/u/fsx)\ **Post date:** [March 21, 2020, 12:43am UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/3 "2020-03-21T00:43:41Z")
thanks i get it ,I tried many libaries of your provides。the one maven: io.jsonwebtoken / jjwt / 0.9.0 successed。thank u。 ---
**Author:** ![tommy](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tommy/32/72769_2.png) [@tommy](https://devforum.zoom.us/u/tommy)\ **Post date:** [March 23, 2020, 6:41am UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/4 "2020-03-23T06:41:56Z")
Glad it is working now! 🙂 Let us know if you have additional questions! 🙂 -Tommy ---
**Author:** ![jmery24](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/jmery24/32/5990_2.png) [@jmery24](https://devforum.zoom.us/u/jmery24)\ **Post date:** [April 15, 2020, 2:47am UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/5 "2020-04-15T02:47:08Z")
Hi fsx, can you share the code pls ? Thanks a lot ---
**Author:** ![fsx](https://avatars.discourse-cdn.com/v4/letter/f/ba9def/32.png) [@fsx](https://devforum.zoom.us/u/fsx)\ **Post date:** [April 15, 2020, 6:47am UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/6 "2020-04-15T06:47:39Z")
![image](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/2X/4/45f44ff74c0bccd1c5625f771417ddb4deb0e26a.jpeg) Map\ header = new HashMap\<\>(); header.put(“alg”,“HS256”); header.put(“type”,“JWT”); ``` String headerEncode = Base64.getUrlEncoder().encodeToString(header.toString().getBytes()); SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256; SecretKey key = Keys.hmacShaKeyFor("".getBytes(StandardCharsets.UTF_8)); String jwt = Jwts.builder().setHeader(header).setIssuer(""). setExpiration(new Date(new Date().getTime()+80000000)).signWith(key,signatureAlgorithm).compact(); System.out.println(headerEncode); System.out.println(jwt); ``` ---
**Author:** ![jmery24](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/jmery24/32/5990_2.png) [@jmery24](https://devforum.zoom.us/u/jmery24)\ **Post date:** [April 15, 2020, 6:12pm UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/7 "2020-04-15T18:12:26Z")
Great, thank yo very much. Work Perfect !!! ---
**Author:** ![tommy](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tommy/32/72769_2.png) [@tommy](https://devforum.zoom.us/u/tommy)\ **Post date:** [April 16, 2020, 5:43am UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/8 "2020-04-16T05:43:14Z")
Hey @jmery24 happy to hear it worked! 🙂 Thanks for your help @fsx! -Tommy ---
**Author:** ![mformayank10](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/mformayank10/32/3954_2.png) [@mformayank10](https://devforum.zoom.us/u/mformayank10)\ **Post date:** [May 21, 2020, 6:48am UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/9 "2020-05-21T06:48:53Z")
Hi can you share jar you have been used in this code ---
**Author:** ![tommy](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tommy/32/72769_2.png) [@tommy](https://devforum.zoom.us/u/tommy)\ **Post date:** [May 27, 2020, 6:07pm UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/10 "2020-05-27T18:07:26Z")
Hey @mformayank10, Let us know if there is something we can help with. Thanks, Tommy ---
**Author:** ![DeveloperBot](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/developerbot/32/12632_2.png) [@DeveloperBot](https://devforum.zoom.us/u/DeveloperBot)\ **Post date:** [August 21, 2020, 9:33pm UTC](https://devforum.zoom.us/t/when-i-use-java-application-to-get-token-jwt-error/9082/11 "2020-08-21T21:33:03Z")