Design Pattern: Associated Items

Tutorials & Examples
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14

Hi.
I’ve been working through a few of the Design Pattern articles - they’re helping me get a better understanding of Openhab2. Thank-you for taking the time to write them up.

I have been trying to add the LastUpdate feature to my setup, using this as a guide. I think I’m nearly there, but I get an error at the assocDT.postUpdate(new DateTimeType(door.lastUpdate)) stage;
This gives the output (full detail further below)

2017-07-02 18:40:24.019 [ERROR] [.script.engine.ScriptExecutionThread] - Rule 'A Door's State Changed': Could not invoke constructor: org.eclipse.smarthome.core.library.types.DateTimeType.DateTimeType(java.lang.String)

The code I am using is very similar to the original post in this article (and the associated one on persistence), with a few log lines for debugging and a temporary workaround for Groups following a recent OH update: Groups seem to be broken

2017-07-02 18:32:47.040 [INFO ] [rthome.model.script.associated items] - Door state change rule started
2017-07-02 18:32:47.190 [INFO ] [rthome.model.script.associated items] - dtStr = testDoor_LastUpdate
2017-07-02 18:32:47.215 [INFO ] [rthome.model.script.associated items] - assocDT = testDoor_LastUpdate (Type=DateTimeItem, State=NULL, Label=test Door Last Update, Category=clock, Groups=[gDoorsLastUpdate])
2017-07-02 18:32:47.279 [INFO ] [rthome.model.script.associated items] - door.lastUpdate = 2017-07-02T18:32:46.000+01:00
2017-07-02 18:32:47.330 [ERROR] [.script.engine.ScriptExecutionThread] - Rule 'A Door's State Changed': Could not invoke constructor: org.eclipse.smarthome.core.library.types.DateTimeType.DateTimeType(java.lang.String)

Key snippets below - wondering if anyone can suggest how to fix?;

From .rules

//from: https://community.openhab.org/t/design-pattern-associated-items/15790

val logName = "associated items"

rule "A Door's State Changed"
when
    Item gDoors received update // NOTE: the rule will trigger multiple times per event
then
        logInfo(logName, "Door state change rule started")
        gDoors.members.forEach[door |
        // Get the associated DateTime Item
        val dtStr = door.name + "_LastUpdate"
        val assocDT = gDoorsLastUpdate.members.filter[dt|dt.name == dtStr].head as DateTimeItem
        logInfo(logName, "dtStr = " + dtStr)
        logInfo(logName, "assocDT = " + assocDT )
        logInfo(logName, "door.lastUpdate = "+ door.lastUpdate)

        // Update assocDT with the door's lastUpdate
        assocDT.postUpdate(new DateTimeType(door.lastUpdate))

    ]
end

from .items

//from: https://community.openhab.org/t/design-pattern-associated-items/15790


Group:Contact  gDoors                           // temporary workaround following recent OH update:https://community.openhab.org/t/groups-seem-to-be-broken/29307
Group gDoorsLastUpdate

Contact  testDoor               "test Door"                             <frontdoor>     (gDoors,GarageDoorGroup,gHistory,gNewDoorGroup)   {mqtt="<[mysensorsMQTT:mysensors/in/100/2/1/0/16:state:MAP(PIR.map)]"}
DateTime testDoor_LastUpdate    "test Door Last Update [%1$tm/%1$td %1tH:%1tM]" <clock> (gDoorsLastUpdate)

This gives the output:

2017-07-02 18:40:23.807 [INFO ] [rthome.model.script.associated items] - Door state change rule started
2017-07-02 18:40:23.952 [INFO ] [rthome.model.script.associated items] - dtStr = testDoor_LastUpdate
2017-07-02 18:40:23.970 [INFO ] [rthome.model.script.associated items] - assocDT = testDoor_LastUpdate (Type=DateTimeItem, State=NULL, Label=test Door Last Update, Category=clock, Groups=[gDoorsLastUpdate])
2017-07-02 18:40:23.996 [INFO ] [rthome.model.script.associated items] - door.lastUpdate = 2017-07-02T18:40:23.000+01:00
2017-07-02 18:40:24.019 [ERROR] [.script.engine.ScriptExecutionThread] - Rule 'A Door's State Changed': Could not invoke constructor: org.eclipse.smarthome.core.library.types.DateTimeType.DateTimeType(java.lang.String)

To be honest I understand enough of the syntax for the assocDT.postUpdate to work out what’s causing the error.

Any ideas on how to fix, or dig deeper into the logs?

Thanks

Luke.