ISE in xtext rule engine / thingStatusInfo

[cweitkamp]

I am experiencing the following ISE when using the getThingStatusInfo() action in one of my rules inside a lambda. Without finding a solution for it I finally decides to post it here and ask for help. Any ideas?

import org.eclipse.xtext.xbase.lib.Functions

val Functions$Function1<String, String> getThingStatus = [ String thingUID |
    val thingStatusInfo = getThingStatusInfo(thingUID)
    if( thingStatusInfo === null ) {
        "OFFLINE"
    } else {
        thingStatusInfo.getStatus().toString()
    }
]

rule "My Thing - Thing Status changed"
when
    Thing "my:thing:uid" changed
then
    try {
        myItem.postUpdate(getThingStatus.apply("my:thing:uid"))
    } catch(Exception e) {
        logError("thing-status", "Exception: {}", e)
    }
end

2019-01-08 21:22:30.356 [ERROR] [.smarthome.model.script.thing-status] - Exception: {}
java.lang.IllegalStateException: null
        at org.eclipse.xtext.xbase.typesystem.references.UnboundTypeReference.doCopyInto(UnboundTypeReference.java:677) ~[?:?]
        at org.eclipse.xtext.xbase.typesystem.references.UnboundTypeReference.copyInto(UnboundTypeReference.java:433) ~[?:?]
        at org.eclipse.xtext.xbase.typesystem.internal.ResolvedTypes.toOwnedReference(ResolvedTypes.java:599) ~[?:?]
        at org.eclipse.xtext.xbase.typesystem.internal.ResolvedTypes.getExpectedType(ResolvedTypes.java:622) ~[?:?]
        at org.eclipse.xtext.xbase.typesystem.internal.ForwardingResolvedTypes.getExpectedType(ForwardingResolvedTypes.java:90) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:205) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:447) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:228) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:204) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:464) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:244) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:204) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:447) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:228) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:204) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluate(XbaseInterpreter.java:190) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.ClosureInvocationHandler.doInvoke(ClosureInvocationHandler.java:46) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.AbstractClosureInvocationHandler.invoke(AbstractClosureInvocationHandler.java:29) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeOperation(XbaseInterpreter.java:1079) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeOperation(XbaseInterpreter.java:1061) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1047) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:992) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:151) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:772) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:220) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:204) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluateArgumentExpressions(XbaseInterpreter.java:1116) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1046) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:992) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:151) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:772) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:220) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:204) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:447) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:228) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:204) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:626) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:260) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:204) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:447) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:228) ~[?:?]
        at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:204) ~[?:?]
        at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluate(XbaseInterpreter.java:190) ~[?:?]
        at org.eclipse.smarthome.model.script.runtime.internal.engine.ScriptImpl.execute(ScriptImpl.java:82) ~[?:?]
        at org.eclipse.smarthome.model.rule.runtime.internal.engine.RuleEngineImpl.lambda$2(RuleEngineImpl.java:341) ~[?:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:?]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:?]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:?]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
        at java.lang.Thread.run(Thread.java:748) [?:?]

[5iver]

Using your example, putting in a valid Item and ThingUID (although, I tried with an invalid one too), and adding some more logging, I could not reproduce the ISE. Let me know if there is something else you'd like me to try! BTW, you don't need to use empty parens in Xtend (hard habit to break).

Maybe you could just add a Kodi System state Channel. 😛

[cweitkamp]

@openhab-5iver I forgot to mention: In general the rule plus lambda are working fine. The ISE occurs randomly two or three times a day. I use this setup to check the status for nearly 150 different things. It is kind of hard to reproduce.

Thanks for the hint to not use empty parentheses. I will try that but imho it looks really strange.