Strict JSON validation during parsing of configuration parameters

[brenuart]

A Jackson JsonParser is used at different places in the project to convert a JSON string into a JsonNode. Reading the string is usually done as follows:

try (JsonParser parser = jsonFactory.createParser(json)) {
   JsonNode node = parser.readValueAsTree();
}

It should be notated that the parser will stop reading the input after it found a valid JsonNode entry, leaving the rest of the string unread. This means that a string like "1 garbage" is accepted and returns a single NumericNode with value 1, ignoring the garbage at the end of the string. For the same reason, parsing "{"name":"value"} garbage" will return an ObjectNode with the name/value pair, leaving garbage unread until the next attempt at reading from the same parser.

Converting a JSON string into a JsonNode is required when processing user-supplied configuration settings (expressed as string in the XML configuration). These fields are meant to contain a valid JSON and should obviously fail or raise an ERROR status in the scenarios described above.