Spring URI Builder WebClient

[dusty cosmos]

I am trying to pass in a value to a endpoint to retrieve information based on another endpoint. Currently this is my method for the endpoint which has a value passed into it:

public OrderRoot getOrder(String orderNumber, int skip) {
        return webClient
                .get()
                .uri(uriBuilder -> uriBuilder
                        .path("/order/get")
                        .queryParam("selector", "{\"order_number\":\"" + orderNumber + "\"}")
                        .queryParam("limit", 100)
                        .queryParam("skip", skip)
                        .build())
                .header(auth, skuT + token)
                .retrieve()
                .bodyToMono(OrderRoot.class)
                .block();
    }```

In theory, this should print out as:
`/order/get?selector={"order_number":"E000"}`
where `E000` is the value being passed in. But I seem to be running into this error:

`There was an exception while trying to navigate to 'searchbydate' with the root cause 'java.lang.IllegalArgumentException: Not enough variable values available to expand '"order_number"''`

[latent thorn]

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