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Type Reason Java.Lang.IllegalStateException if the next token is not a literal value. Java.Lang.NumberFormatException if the next literal value cannot be parsed as a number, or exactly represented as a long. Java.IO.IOException
Returns the JsonToken.Number value of the next token, consuming it. If the next token is a string, this method will attempt to parse it as a long. If the next token's numeric value cannot be exactly represented by a Java long, this method throws.