JIRA REST API - Edit Issues

• When you want to update a field with JIRA REST API, first write it i json format.  Ex: I want to update the summary of an issue.        
• {"fields": {"summary":{"name":"bahar"}}}
•  You can try it with curl commant whether it works or not.
•   curl -D- -X PUT -H "Authorization: Basic YWRtaW46SDF0MXQ=" --data "{\"fields\":{\"summary\":\"bahar\"}}"   -H "Content-Type: application/json" "http://localhost:8080/rest/api/2/issue/TAI-9"
•  You should use PUT for updating.
• Don't forget to add "\" backslash  before the double quotes.
• You should encode your username:password with base 64 encode.
• encoder 
• write your username:password, and the output will be "YWRtaW46SDF0MXQ= " something like this. Write the output to the authorization. 
• Ex: "Authorization: Basic YWRtaW46SDF0MXQ="  
• "http://localhost:8080/rest/api/2/issue/TAI-9" is the issue that you want to update.
•   You can do the same thing with java code.Here is the method:   

     public static String updateSummary() throws IOException {
     
        URL url = new URL("http://localhost:8080/rest/api/2/issue/TAI-9");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoOutput(true);
        conn.setDoInput(true);

        String credentials = "username" + ":" + "password";
        String encoding = Base64Converter.encode(credentials.getBytes("UTF-8"));
        conn.setRequestProperty("Authorization", String.format("Basic %s", encoding));
       
        conn.setRequestMethod("PUT");
        conn.setRequestProperty("Content-Type", "application/json");
       
        conn.connect();
      
        String st="{\"fields\":{\"summary\":\"bahar\"}}"; 

        byte[] outputBytes = st.getBytes("UTF-8");
        OutputStream os = conn.getOutputStream();
        os.write(outputBytes);
        os.flush();
       
        BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        StringBuilder sb = new StringBuilder();
        String line;
        while ((line = rd.readLine()) != null) {
          sb.append(line);
        }
        rd.close();

        conn.disconnect();
        return sb.toString();

    }                                                                                                                               

• you can use Base64Convertor.java class. Download
• Here is the atlassian documentation for updating issue via JIRA REST API. atlassian