Model doesn't load any more after upgrade

Somehow I screwed up my installation. AFAIK I triggered an update to openHAB through openHABian so now I’m on openHAB 3.4.4.

I encountered that Settings → Model does not load anymore. There is an error in openhab.log:

2023-06-22 22:06:53.543 [ERROR] [rg.apache.cxf.jaxrs.utils.JAXRSUtils] - Problem with writing the data, class org.openhab.core.io.rest.Stream2JSONInputStream, ContentType: application/json
2023-06-22 22:06:53.545 [ERROR] [internal.JSONResponseExceptionMapper] - Unexpected exception occurred while processing REST request.
java.lang.NullPointerException: Cannot invoke "javax.script.Compilable.compile(java.io.Reader)" because "engine" is null
	at org.openhab.transform.javascript.internal.JavaScriptEngineManager.getCompiledScriptByFilename(JavaScriptEngineManager.java:77) ~[?:?]
	at org.openhab.transform.javascript.internal.JavaScriptTransformationService.transform(JavaScriptTransformationService.java:119) ~[?:?]
	at org.openhab.core.transform.TransformationHelper.transform(TransformationHelper.java:125) ~[?:?]
	at org.openhab.core.transform.TransformationHelper.transform(TransformationHelper.java:100) ~[?:?]
	at org.openhab.core.io.rest.core.item.EnrichedItemDTOMapper.considerTransformation(EnrichedItemDTOMapper.java:148) ~[?:?]
	at org.openhab.core.io.rest.core.item.EnrichedItemDTOMapper.map(EnrichedItemDTOMapper.java:81) ~[?:?]
	at org.openhab.core.io.rest.core.item.EnrichedItemDTOMapper.map(EnrichedItemDTOMapper.java:64) ~[?:?]
	at org.openhab.core.io.rest.core.internal.item.ItemResource.lambda$2(ItemResource.java:222) ~[?:?]
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
	at java.util.HashMap$KeySpliterator.tryAdvance(HashMap.java:1728) ~[?:?]
	at java.util.stream.StreamSpliterators$WrappingSpliterator.lambda$initPartialTraversalState$0(StreamSpliterators.java:292) ~[?:?]
	at java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:206) ~[?:?]
	at java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:169) ~[?:?]
	at java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:298) ~[?:?]
	at java.util.Spliterators$1Adapter.hasNext(Spliterators.java:681) ~[?:?]
	at org.openhab.core.io.rest.Stream2JSONInputStream.fillBuffer(Stream2JSONInputStream.java:91) ~[?:?]
	at org.openhab.core.io.rest.Stream2JSONInputStream.read(Stream2JSONInputStream.java:67) ~[?:?]
	at java.io.InputStream.read(InputStream.java:293) ~[?:?]
	at java.io.InputStream.transferTo(InputStream.java:782) ~[?:?]
	at org.openhab.core.io.rest.core.internal.GsonMessageBodyWriter.writeTo(GsonMessageBodyWriter.java:83) ~[?:?]
	at org.openhab.core.io.rest.core.internal.MediaTypeExtension.writeTo(MediaTypeExtension.java:84) ~[?:?]
	at org.apache.cxf.jaxrs.utils.JAXRSUtils.writeMessageBody(JAXRSUtils.java:1543) ~[bundleFile:3.4.5]
	at org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor.serializeMessage(JAXRSOutInterceptor.java:249) ~[bundleFile:3.4.5]
	at org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor.processResponse(JAXRSOutInterceptor.java:122) ~[bundleFile:3.4.5]
	at org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor.handleMessage(JAXRSOutInterceptor.java:84) ~[bundleFile:3.4.5]
	at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308) ~[bundleFile:3.4.5]
	at org.apache.cxf.interceptor.OutgoingChainInterceptor.handleMessage(OutgoingChainInterceptor.java:90) ~[bundleFile:3.4.5]
	at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308) ~[bundleFile:3.4.5]
	at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121) ~[bundleFile:3.4.5]
	at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:265) ~[bundleFile:3.4.5]
	at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234) ~[bundleFile:3.4.5]
	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208) ~[bundleFile:3.4.5]
	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160) ~[bundleFile:3.4.5]
	at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:225) ~[bundleFile:3.4.5]
	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:298) ~[bundleFile:3.4.5]
	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doGet(AbstractHTTPServlet.java:222) ~[bundleFile:3.4.5]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) ~[bundleFile:3.1.0]
	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:273) ~[bundleFile:3.4.5]
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:550) ~[bundleFile:9.4.46.v20220331]
	at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:74) ~[bundleFile:?]
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:600) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1440) ~[bundleFile:9.4.46.v20220331]
	at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:294) ~[bundleFile:?]
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1355) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) ~[bundleFile:9.4.46.v20220331]
	at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:90) ~[bundleFile:?]
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.Server.handle(Server.java:516) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:487) ~[bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:732) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:479) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883) [bundleFile:9.4.46.v20220331]
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034) [bundleFile:9.4.46.v20220331]
	at java.lang.Thread.run(Thread.java:833) [?:?]

Anybody here who knows how to fix it?

Thanks in advance!

Check if you upgraded your Java version to 17.
You can downgrade to 11 in openHABian.
Or upgrade to OH4 (use milestone for now).

Thanks a lot, that did the trick. Switched to and activated Java11, did a reboot and everythings seems back to work :slight_smile: