java - OncePerRequestFilter doesn't include last character from response body -

i trying implement content digest header in rest api. when creating digest response omits last character.

public class contentdigestfilter extends onceperrequestfilter {

@override protected boolean shouldnotfilterasyncdispatch() {     return false; }  @override protected void dofilterinternal(httpservletrequest request, httpservletresponse response, filterchain filterchain)         throws servletexception, ioexception {      httpservletresponse responsetouse = response;     if (!isasyncdispatch(request) && !(response instanceof contentcachingresponsewrapper)) {         responsetouse = new httpstreamingawarecontentcachingresponsewrapper(response, request);     }      filterchain.dofilter(request, responsetouse);      updateresponse(request, responsetouse); }  private void updateresponse(httpservletrequest request, httpservletresponse response) throws ioexception {     contentcachingresponsewrapper responsewrapper =             webutils.getnativeresponse(response, contentcachingresponsewrapper.class);     assert.notnull(responsewrapper, "contentcachingresponsewrapper not found");     httpservletresponse rawresponse = (httpservletresponse) responsewrapper.getresponse();     int statuscode = responsewrapper.getstatuscode();      if (rawresponse.iscommitted()) {         responsewrapper.copybodytoresponse();     }     else{         string digest = getcontentdigest(responsewrapper.getcontentinputstream());          rawresponse.setheader("x-digest",digest);         responsewrapper.copybodytoresponse();     } }   protected string getcontentdigest(inputstream inputstream) throws ioexception {      try {         byte[] dataarray = streamutils.copytobytearray(inputstream);          //dataarray doesn't include last character of response body.         system.out.println("response body: " + new string(dataarray,"utf-8"));          string digest = ""; //generate digest hmac-sha512          return digest;      } catch (nosuchalgorithmexception e) {         throw new runtimeexception(e);     } catch (invalidkeyexception e) {         e.printstacktrace();     } catch (unsupportedencodingexception e) {         e.printstacktrace();     }     return "nodigest"; }  private static class httpstreamingawarecontentcachingresponsewrapper extends contentcachingresponsewrapper {      private final httpservletrequest request;      public httpstreamingawarecontentcachingresponsewrapper(httpservletresponse response, httpservletrequest request) {         super(response);         this.request = request;     }      @override     public servletoutputstream getoutputstream() throws ioexception {         return super.getoutputstream();     }      @override     public printwriter getwriter() throws ioexception {         return super.getwriter();     } } 

}

in method getcontentdigest if print dataarray doesn't include last character of response