RestTempalete exchange error - spring

Question

I am trying to execute this REST api call as shown below using RESTTemplate
When I run this on browser it runs fine
http://ftc-wbpyrdb201:8080/statdata/InsStatData/_aggrs/getData?avars=%7B%22issuerId%22:19038%7D
But when I use URL in code
http://ftc-wbpyrdb201:8080/statdata/InsStatData/_aggrs/getData?avars={"issuerId":19038}
code is
requestURI="http://ftc-wbpyrdb201:8080/statdata/InsStatData/_aggrs/getData";
UriComponentsBuilder builder =
UriComponentsBuilder.fromUriString(requestURI)
// Add query parameter
.queryParam("avars","{\"issuerId\":19038}");
System.out.println(builder.buildAndExpand(requestURI).toUri());
System.out.println(builder.toUriString());
ResponseEntity<String> responseEntity = restTemplate
.exchange(builder.toUriString() , HttpMethod.GET, null,String.class);
I am getting below error, Please let me know what could be wrong here.
org.springframework.web.client.HttpClientErrorException: 400 Bad Request
at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:63) ~[spring-web-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:700) ~[spring-web-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:653) ~[spring-web-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613) ~[spring-web-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:531) ~[spring-web-4.3.8.RELEASE.jar:4.3.8.RELEASE]

Answer 1

i think you has problem in the query string of the URL, i used your code to print out the uri
System.out.println(builder.toUriString());
the printed string was
http://ftc-wbpyrdb201:8080/statdata/InsStatData/_aggrs/getData?avars=%7B%22issuerId%22:19038%7D
but if you used w3cschool encoder to encode the same url you will get
http://ftc-wbpyrdb201:8080/statdata/InsStatData/_aggrs/getData?avars=%7B%22issuerId%22%3A19038%7D
there is a little difference between the two urls, instead of : the w3school encoder produce %3A