Java does not generate union for simple types

[jonaslagoni]

Describe the bug

In the next version, given the following input:

{
    "type": "object",
    "$id": "LightMeasured",
    "properties": {
        "id": {
            "type": "integer",
            "minimum": 0,
            "description": "Id of the streetlight."
        },
        "lumens": {
            "type": "integer",
            "minimum": 0,
            "description": "Light intensity measured in lumens."
        },
        "sentAt": {
            "$id": "sentAt",
            "type": "string",
            "oneOf": [
                {
                    "format": "date-time",
                    "description": "Date and time when the message was sent."
                },
                {
                    "format": "date",
                    "description": "Date when the message was sent."
                }
            ]
        }
    }
}

It will generate an empty model with no code at all.

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