ResponseEntity returns String instead of xml type in spring boot - spring

Question

I had used spring and weblogic,
I have a method like this:
#RequestMapping(value = "/all/{parentId}", method = RequestMethod.GET)
#ResponseBody
public ResponseEntity<String> getAll(#PathVariable int parentId) {
StringBuffer returnValue = new StringBuffer("");
Power power = iPowerService.loadByEntityId(parentId);
makeTree(power, returnValue);
HttpHeaders responseHeaders = new HttpHeaders();
responseHeaders.add("Content-Type", "text/html; charset=UTF-8");
return new ResponseEntity<String>(returnValue.toString(), responseHeaders, HttpStatus.CREATED);
}
Above method makes xml format for a tree and send it as response to client like this:
<201 Created,
<item text="primary" id="740167402" im0="Mehvar_V.png"
im1="Mehvar_V.png" im2="Mehvar_V.png" isVirtual="true">
<item text="..." im0="leaf.gif" id="t740167402" />
</item>
<item
text="fff"
id="740168675" im0="Mehvar_V.png" im1="Mehvar_V.png" im2="Mehvar_V.png"
isVirtual="true">
<item text="..." im0="leaf.gif" id="t740168675" />
</item>
<item text="mmmehdi" id="12" im0="Mehvar_V.png" im1="Mehvar_V.png"
im2="Mehvar_V.png" isVirtual="true">
<item text="..." im0="leaf.gif" id="t12" />
</item>
<item text="province" id="123" im0="Mehvar_V.png" im1="Mehvar_V.png"
im2="Mehvar_V.png" isVirtual="true">
<item text="..." im0="leaf.gif" id="t123" />
</item>
<item text="power" id="1234" im0="Mehvar_V.png" im1="Mehvar_V.png"
im2="Mehvar_V.png" isVirtual="true">
<item text="..." im0="leaf.gif" id="t1234" />
</item>
,{Content-Type=[text/html; charset=UTF-8]}>
and client converts this response to tree and shows it.
It had worked successfully
When I migrate to spring boot the response of this method is converted to string like this:
"<item text="primary" id="740167402" im0="Mehvar_V.png"
im1="Mehvar_V.png" im2="Mehvar_V.png" isVirtual="true">
<item text="..." im0="leaf.gif" id="t740167402" />
</item>
<item
text="fff"
id="740168675" im0="Mehvar_V.png" im1="Mehvar_V.png" im2="Mehvar_V.png"
isVirtual="true">
<item text="..." im0="leaf.gif" id="t740168675" />
</item>
<item text="mmmehdi" id="12" im0="Mehvar_V.png" im1="Mehvar_V.png"
im2="Mehvar_V.png" isVirtual="true">
<item text="..." im0="leaf.gif" id="t12" />
</item>
<item text="province" id="123" im0="Mehvar_V.png" im1="Mehvar_V.png"
im2="Mehvar_V.png" isVirtual="true">
<item text="..." im0="leaf.gif" id="t123" />
</item>
<item text="power" id="1234" im0="Mehvar_V.png" im1="Mehvar_V.png"
im2="Mehvar_V.png" isVirtual="true">
<item text="..." im0="leaf.gif" id="t1234" />
</item>"
As you see "" SURROUND my output
What and why is happen?
Why my response send string to client.
I want output as same as it worked successfully

Answer 1

With the #ResponseBody, you don't have to wrap your response in a new ResponseEntity, you could juste do this:
#RequestMapping(value = "/all/{parentId}", method = RequestMethod.GET)
#ResponseBody
#ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
public String getAll(#PathVariable int parentId) {
StringBuffer returnValue = new StringBuffer("");
...
return returnValue.toString()
}
or you could juste remove the response body:
#RequestMapping(value = "/all/{parentId}", method = RequestMethod.GET)
public ResponseEntity<String> getAll(#PathVariable int parentId) {