How to include new line character in ADD COMMENT API

[Deleted user]

I'm writing a small Groovy script to add comment to Jira issue, but not able to break the comment into lines using new line char,  in cURL it works ok. 

here is a cURL code that works

curl -k -u id:pwd X POST --data {"body":"This is line1\n\nThis is line 2"} -H "Content-Type: application/json" http://examplejira.com/rest/api/2/issue/TESTKEY-1/comment 

The added comment is shown correctly as

This is line 1

This is line 2

This is the Groovy codes that does not work. 

HttpRequest request = new HttpPost(requestURL);
request.setHeader(HttpHeaders.CONTENT_TYPE, "application/json");
request.setEntity(new StringEntity("This is line 1\n\nThisis line 2"));

HttpResponse response = client.execute(request);
System.out.println(response.getProtocolVersion());
System.out.println(response.getStatusLine().getStatusCode());
System.out.println(response.getStatusLine().getReasonPhrase());
System.out.println(response.getStatusLine().toString());

Output is  

HTTP/1.1

400 

HTTP/1.1 400

If I change the setEntity to 

request.setEntity(new StringEntity("This is line 1 Thisis line 2"));

Then it works but without line break obviously

Anyone can help ??

[Deleted user]

p.s.   also tried 

request.setEntity(new StringEntity("This is line 1%0AThis is line 2"));

request.setEntity(new StringEntity("This is line 1%0A%0DThis is line 2"));

httppost request completed Ok, but %0A and %0D is output as text.

i.e.   This is line 1%0A%0DThis is line 2