API Explorer not working on Windows 11

[Appelflap22]

The problem

When I select "developer tools-> API Explorer" then I only get an empty screen.

Expected behavior

API Explorer should show up

Steps to reproduce

Problem is always there, never used the API explorer since openHAB 2, so I don't know if it worked correctly on previous versions of openHAB 3&4.

Your environment

runtimeInfo:
version: 4.1.2
buildString: Release Build
locale: en-NL
systemInfo:
configFolder: C:\openHAB\conf
userdataFolder: C:\openHAB\userdata
logFolder: C:\openHAB\userdata\logs
javaVersion: 17.0.8.1
javaVendor: Azul Systems, Inc.
javaVendorVersion: Zulu17.44+53-CA
osName: Windows 11
osVersion: "10.0"
osArchitecture: amd64
availableProcessors: 4
freeMemory: 193523688
totalMemory: 448790528
uptime: 564
startLevel: 70
addons:

• automation-jsscripting
• binding-astro
• binding-evohome
• binding-exec
• binding-fsinternetradio
• binding-ipcamera
• binding-logreader
• binding-mqtt
• binding-nanoleaf
• binding-shelly
• binding-tr064
• binding-zigbee
• binding-zwave
• misc-openhabcloud
• persistence-rrd4j
• transformation-jsonpath
• transformation-regex
• ui-basic
• ui-habpanel
  clientInfo:
  device:
  ios: false
  android: false
  androidChrome: false
  desktop: true
  iphone: false
  ipod: false
  ipad: false
  edge: false
  ie: false
  firefox: false
  macos: false
  windows: true
  cordova: false
  phonegap: false
  electron: false
  nwjs: false
  webView: false
  webview: false
  standalone: false
  os: windows
  pixelRatio: 1
  prefersColorScheme: dark
  isSecureContext: true
  locationbarVisible: true
  menubarVisible: true
  navigator:
  cookieEnabled: true
  deviceMemory: 8
  hardwareConcurrency: 4
  language: en
  languages:
  • en
  • nl-NL
  • de
  • nl
  • en-US
    onLine: true
    platform: Win32
    screen:
    width: 1600
    height: 900
    colorDepth: 24
    support:
    touch: false
    pointerEvents: true
    observer: true
    passiveListener: true
    gestures: false
    intersectionObserver: true
    themeOptions:
    dark: dark
    filled: true
    pageTransitionAnimation: default
    bars: light
    homeNavbar: default
    homeBackground: default
    expandableCardAnimation: default
    userAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML,
    like Gecko) Chrome/123.0.0.0 Safari/537.36
    timestamp: 2024-04-03T06:20:16.935Z

Browser console

app.ac598e3ce6e035bd1153.js:7

   POST http://localhost/rest/auth/token 400 (Bad Request)

s @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
s.promise @ app.ac598e3ce6e035bd1153.js:7
postPlain @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:23
refreshAccessToken @ app.ac598e3ce6e035bd1153.js:23
onPageAfterIn @ 15.app.ac598e3ce6e035bd1153.js:1
Ue @ app.ac598e3ce6e035bd1153.js:7
n @ app.ac598e3ce6e035bd1153.js:7
Ue @ app.ac598e3ce6e035bd1153.js:7
e.$emit @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
t.a @ app.ac598e3ce6e035bd1153.js:7
dispatchEvent @ app.ac598e3ce6e035bd1153.js:23
onPageAfterIn @ app.ac598e3ce6e035bd1153.js:23
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
value @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
value @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
value @ app.ac598e3ce6e035bd1153.js:7
value @ app.ac598e3ce6e035bd1153.js:7
q @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
o @ app.ac598e3ce6e035bd1153.js:1
c @ app.ac598e3ce6e035bd1153.js:1
app.ac598e3ce6e035bd1153.js:23 Bad Request
developer/api-explorer:1 Uncaught (in promise) Bad Request
Promise.then (async)
onPageAfterIn @ 15.app.ac598e3ce6e035bd1153.js:1
Ue @ app.ac598e3ce6e035bd1153.js:7
n @ app.ac598e3ce6e035bd1153.js:7
Ue @ app.ac598e3ce6e035bd1153.js:7
e.$emit @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
t.a @ app.ac598e3ce6e035bd1153.js:7
dispatchEvent @ app.ac598e3ce6e035bd1153.js:23
onPageAfterIn @ app.ac598e3ce6e035bd1153.js:23
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
value @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
value @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
value @ app.ac598e3ce6e035bd1153.js:7
value @ app.ac598e3ce6e035bd1153.js:7
q @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
(anonymous) @ app.ac598e3ce6e035bd1153.js:7
o @ app.ac598e3ce6e035bd1153.js:1
c @ app.ac598e3ce6e035bd1153.js:1

Browser network traffic

Additional information

Looks like an authentication issue, openHab log file below:
2024-04-03 08:23:57.368 [ERROR] [.io.rest.auth.internal.TokenResource] - Error while authenticating java.lang.NullPointerException: Cannot invoke "org.openhab.core.auth.UserSession.getRefreshToken()" because "s" is null at org.openhab.core.io.rest.auth.internal.TokenResource.lambda$7(TokenResource.java:382) ~[?:?] at java.util.stream.MatchOps$1MatchSink.accept(MatchOps.java:90) ~[?:?] at java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1602) ~[?:?] at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:129) ~[?:?] at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:527) ~[?:?] at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:513) ~[?:?] at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?] at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230) ~[?:?] at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196) ~[?:?] at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?] at java.util.stream.ReferencePipeline.anyMatch(ReferencePipeline.java:632) ~[?:?] at org.openhab.core.io.rest.auth.internal.TokenResource.lambda$6(TokenResource.java:382) ~[?:?] at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:178) ~[?:?] at java.util.HashMap$KeySpliterator.tryAdvance(HashMap.java:1728) ~[?:?] at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:129) ~[?:?] at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:527) ~[?:?] at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:513) ~[?:?] at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?] at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:150) ~[?:?] at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?] at java.util.stream.ReferencePipeline.findAny(ReferencePipeline.java:652) ~[?:?] at org.openhab.core.io.rest.auth.internal.TokenResource.processRefreshTokenGrant(TokenResource.java:383) ~[?:?] at org.openhab.core.io.rest.auth.internal.TokenResource.getToken(TokenResource.java:129) ~[?:?] at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:179) ~[bundleFile:3.6.2] at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96) ~[bundleFile:3.6.2] at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:201) ~[bundleFile:3.6.2] at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:104) ~[bundleFile:3.6.2] at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59) ~[bundleFile:3.6.2] at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96) ~[bundleFile:3.6.2] at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307) ~[bundleFile:3.6.2] at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121) ~[bundleFile:3.6.2] at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:265) ~[bundleFile:3.6.2] at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234) ~[bundleFile:3.6.2] at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208) ~[bundleFile:3.6.2] at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160) ~[bundleFile:3.6.2] at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:225) ~[bundleFile:3.6.2] at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:304) ~[bundleFile:3.6.2] at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:217) ~[bundleFile:3.6.2] at javax.servlet.http.HttpServlet.service(HttpServlet.java:517) ~[bundleFile:4.0.4] at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:279) ~[bundleFile:3.6.2] at org.ops4j.pax.web.service.spi.servlet.OsgiInitializedServlet.service(OsgiInitializedServlet.java:102) ~[bundleFile:?] at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1656) ~[bundleFile:9.4.52.v20230823] at org.ops4j.pax.web.service.spi.servlet.OsgiFilterChain.doFilter(OsgiFilterChain.java:100) ~[bundleFile:?] at org.ops4j.pax.web.service.jetty.internal.PaxWebServletHandler.doHandle(PaxWebServletHandler.java:320) ~[bundleFile:?] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:600) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1440) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:505) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1355) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:234) ~[bundleFile:9.4.52.v20230823] at org.ops4j.pax.web.service.jetty.internal.PrioritizedHandlerCollection.handle(PrioritizedHandlerCollection.java:96) ~[bundleFile:?] at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:722) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.Server.handle(Server.java:516) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:487) ~[bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:732) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:479) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883) [bundleFile:9.4.52.v20230823] at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034) [bundleFile:9.4.52.v20230823] at java.lang.Thread.run(Thread.java:833) [?:?]