"IllegalArgumentException: Invalid cron expression", but UI accepts expression

[mueller-ma]

In openHAB 3.3.0 release build I configured a rule to trigger at cron expression 15 13 * * 1,3,5:

As you can see the UI can parse and interpret the expression as I (and several other tools, e.g. https://crontab.guru/#15_13_*_*_1,3,5 ) expect. But when I want to enable the rule, the following stack trace is written to the log and the rule stays uninitialized.

2022-12-13 10:44:41.578 [ERROR] [internal.JSONResponseExceptionMapper] - Unexpected exception occurred while processing REST request.
java.lang.IllegalArgumentException: Invalid cron expression, too little fields. 6 or 7 (with year) expected but was: '15 13 * * 1,3,5'
        at org.openhab.core.scheduler.CronAdjuster.<init>(CronAdjuster.java:96) ~[?:?]
        at org.openhab.core.internal.scheduler.CronSchedulerImpl.schedule(CronSchedulerImpl.java:68) ~[?:?]
        at org.openhab.core.internal.scheduler.CronSchedulerImpl.schedule(CronSchedulerImpl.java:62) ~[?:?]
        at org.openhab.core.automation.internal.module.handler.GenericCronTriggerHandler.scheduleJob(GenericCronTriggerHandler.java:66) ~[?:?]
        at org.openhab.core.automation.internal.module.handler.GenericCronTriggerHandler.setCallback(GenericCronTriggerHandler.java:62) ~[?:?]
        at org.openhab.core.automation.internal.RuleEngineImpl.lambda$0(RuleEngineImpl.java:637) ~[?:?]
        at java.util.ArrayList.forEach(ArrayList.java:1541) ~[?:?]
        at java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1085) ~[?:?]
        at org.openhab.core.automation.internal.RuleEngineImpl.register(RuleEngineImpl.java:634) ~[?:?]
        at org.openhab.core.automation.internal.RuleEngineImpl.activateRule(RuleEngineImpl.java:852) ~[?:?]
        at org.openhab.core.automation.internal.RuleEngineImpl.setEnabled(RuleEngineImpl.java:803) ~[?:?]
        at org.openhab.core.automation.rest.internal.RuleResource.enableRule(RuleResource.java:307) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
        at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:179) ~[bundleFile:3.4.5]
        at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96) ~[bundleFile:3.4.5]
        at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:201) ~[bundleFile:3.4.5]
        at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:104) ~[bundleFile:3.4.5]
        at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59) ~[bundleFile:3.4.5]
        at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96) ~[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.doPost(AbstractHTTPServlet.java:217) ~[bundleFile:3.4.5]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) ~[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.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:555) [bundleFile:9.4.46.v20220331]
        at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:410) [bundleFile:9.4.46.v20220331]
        at org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:164) [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:829) [?:?]

[J-N-K]

openHAB requires seconds to be specified in the cron expression. It is an UI bug that a cron expression without it is accepted.

BTW: If you use the cron expression builder in UI to configure "At 13:15, only on Monday, Wednesday, and Friday", you'll get 0 15 13 ? * MON,WED,FRI *.

@kaikreuzer Can you transfer this to openhab-webui? Thanks.