My guess is that line 15 `this.resourceId = resour...

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My guess is that line 15 this.resourceId = resourceId points to the same property. You are executing apply(block) so inside block this is an Args and it shadows `Test`'s resource id property. If you type this code in Intellij Idea, you'll see a warning that resourceId: Long in line 13 is never used. But change the name in lines 13 and 15 and it should work, result of line 20 is - as I assume - a map {RESOURCE_ID=1}.