FULL PRODUCT VERSION :
java version "9.0.4"
Java(TM) SE Runtime Environment (build 9.0.4+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.4+11, mixed mode)

jdk 9.0.4

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.16299.248]

A DESCRIPTION OF THE PROBLEM :
HttpRequest httpGet = HttpRequest.newBuilder()
     .uri(new URI("http://data.matricula-online.eu/de/oesterreich/st-poelten/eggenburg/01%252F03/")
     .GET()
     .build();

httpClient.send(httpGet, HttpResponse.BodyHandler.asByteArray());


The URI contains "01%252F03"
this is changed to "01%2F03"

before it is sent over the line. This results in Error 404 from the server.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
URI encoding should not change
ACTUAL -
The URI contains "01%252F03"
this is changed to "01%2F03"


REPRODUCIBILITY :
This bug can be reproduced always.