Per message from @Stefan Cronje the issue was a missing coverage.list. I've filed https://github.com/intersystems/TestCoverage/issues/11 to cover an enhancement to fail early and descriptively in this case rather than just doing nothing. 

It's also possible that %objlasterror is leaking without that error being the root cause of any issues. I'd start by looking at how you're saying which units of code to measure coverage for - e.g., via coverage.list or an explicit list passed in to the CoverageClasses/CoverageRoutines parameter as described at https://github.com/intersystems/TestCoverage

@Stefan Cronje I've sent you a message. The discussion at https://github.com/intersystems/TestCoverage/issues/10
 is relevant but I think your root cause may be different.
Basic troubleshooting steps / things to think about:
* Is the line-by-line monitor running? (do ^%SYS.MONLBL and see what it says)
* Do you have .int code for the classes for which you're measuring coverage? (compile with the "k" flag to keep this around)
* Did you say what classes/routines you wanted to measure coverage of? (see instructions at https://github.com/intersystems/TestCoverage)

Given that two people have run into this now I think there's something that should be changed to help avoid the situation. Perhaps forcing the line-by-line monitor/PERFMON to stop (if it's running) prior to starting it for a test coverage run and/or identifying possible causes of the issue.

Right - at this point I'd say set Server to apisidra.ibge.gov.br instead of api.sidra.ibge.gov.br and see if that fixes it.

It looks like there might be an issue with the service you're trying to use - at https://apisidra.ibge.gov.br/ , pasting in "/t/1612/n2/all/v/all/p/last/c81/2702/f/u" as "Parâmetros/valores da API:" then clicking "Consultar" I get an alert saying "A solicitação de conexão com pools sofreu timeout".

I also see this from ObjectScript with Server set to apisidra.ibge.gov.br instead of api.sidra.ibge.gov.br

Note, this also assumes default global names - if you have customized these, you'll want to just get all globals. Also, replace 'C:\InterSystems\IRIS20\mgr\user' with the appropriate database directory for your instance.

Clarifying: I really enjoy the coding challenges and would highly recommend them, but competing for a top spot is a level of intensity beyond what I'd do. (Even if I wasn't an InterSystems employee and was eligible for prizes other than clout. )

Based on past years (participating as I have time between my day job and family obligations... so typically dropping off around the 15th), the ObjectScript leaderboard tends to be pretty competitive. Especially in terms of when the challenges drop - I'm not staying up until midnight or whatever it is to be in the top few.

Generally, Docker is better on a Mac than Windows, from what I hear.

See also: https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.cl…

Whoa - I had no idea iFind had JSON indexing features. That said, the docs aren't really helpful here. I'll issue another call for @Benjamin De Boe to chime in :)

No, the index that uses BuildValueArray is updated automatically after %Save()/insert/update/etc. The Run() method just demonstrates how the index works, it doesn't do anything special or index-specific.

We've done something similar to this for indexing with JSON paths (in the style of https://goessner.net/articles/JsonPath/) as the keys and the value at that path as the value.

Maybe not simpler, and definitely more complicated if you use a stream rather than a string with MAXLEN="" (which I'll demo below); here's what it ends up looking like:

Class DC.Demo.JSON Extends %String [ ClassType = datatype ]
{

Parameter MAXLEN;

/// Builds value array with subscripts set to values of properties in the JSON stream.
ClassMethod BuildValueArray(value As DC.Demo.JSON, ByRef valueArray As %String) As %Status [ Private ]
{
    set sc = $$$OK
    try {
        set object = {}.%FromJSON(value)
        do ..AddObjectToValueArray(object,.valueArray)
    } catch e {
        set sc = e.AsStatus()
    }
    quit sc
}

ClassMethod AddObjectToValueArray(object As %DynamicAbstractObject, ByRef valueArray, truncateToLength As %String = 255)
{
    set iter = object.%GetIterator()
    while iter.%GetNext(.key,.value) {
        if $isobject(value) {
            do ..AddObjectToValueArray(value,.valueArray)
        } else {
            set sub = $extract(value,1,truncateToLength)
            set valueArray(sub) = ""
        }
    }
}

}

Class DC.Demo.IndexJSON Extends %Persistent
{

Property JSON As JSON(MAXLEN = "");

Index JSONValues On JSON(KEYS);

ClassMethod Run()
{
    try {
        do ..%KillExtent()
        for json = {"FirstName":"Magnus", "LastName":"Guvenal"},
        ["Magnus", "Guvenal"],
        {
            "a":{"b":{"c":"Magnus"
            } }} {
            set inst = ..%New()
            set inst.JSON = json.%ToJSON()
            $$$ThrowOnError(inst.%Save())
        }
        do ..DisplaySQL("select JSON from DC_Demo.IndexJSON where for some %ELEMENT(JSON) (%KEY = 'Magnus')")
        do ..DisplaySQL("select JSON from DC_Demo.IndexJSON where for some %ELEMENT(JSON) (%KEY = 'Guvenal')")
        do ..DisplaySQL("select JSON from DC_Demo.IndexJSON where for some %ELEMENT(JSON) (%KEY = 'FirstName')")
    } catch e {
        set sc = e.AsStatus()
        write !,$system.Status.GetErrorText(sc)
    }
}

ClassMethod DisplaySQL(query, args...)
{
    write !,query,!
    for i=1:1:$get(args) {
        write "argument: ",args(i),!
    }
    do ##class(%SQL.Statement).%ExecDirect(,query,args...).%Display()
}

Storage Default
{
<Data name="IndexJSONDefaultData">
<Value name="1">
<Value>%%CLASSNAME</Value>
</Value>
<Value name="2">
<Value>JSON</Value>
</Value>
</Data>
<DataLocation>^DC.Demo.IndexJSOND</DataLocation>
<DefaultData>IndexJSONDefaultData</DefaultData>
<IdLocation>^DC.Demo.IndexJSOND</IdLocation>
<IndexLocation>^DC.Demo.IndexJSONI</IndexLocation>
<StreamLocation>^DC.Demo.IndexJSONS</StreamLocation>
<Type>%Storage.Persistent</Type>
}

}

In action:

USER>d ##class(DC.Demo.IndexJSON).Run()
 
select JSON from DC_Demo.IndexJSON where for some %ELEMENT(JSON) (%KEY = 'Magnus')
JSON
{"FirstName":"Magnus","LastName":"Guvenal"}
["Magnus","Guvenal"]
{"a":{"b":{"c":"Magnus"}}}
 
3 Rows(s) Affected
select JSON from DC_Demo.IndexJSON where for some %ELEMENT(JSON) (%KEY = 'Guvenal')
JSON
{"FirstName":"Magnus","LastName":"Guvenal"}
["Magnus","Guvenal"]
 
2 Rows(s) Affected
select JSON from DC_Demo.IndexJSON where for some %ELEMENT(JSON) (%KEY = 'FirstName')
JSON
 
0 Rows(s) Affected