How to implement a ParamConverterProvider that works with same key query process

[Sboti03]

Hi everyone,

I'm facing an issue with handling collection type @QueryParam in my JAX-RS application. I'm using ParamConverterProvider to convert query parameters to custom Java types. However, I'm having trouble when the request includes multiple keys for the same parameter.

When I call the endpoint with multiple keys like this:

/api?name=Bob&name=James

Only the first parameter (Bob) gets converted. However, it works fine when I use a single key with comma-separated values:

/api?name=Bob,James

Here's a brief overview of my setup:

• I'm using ParamConverterProvider to provide ParamConverter instances for custom types.
• I've created a CollectionParameterConverter to handle collections of these types.
• The conversion works as expected for comma-separated values but not for multiple keys.

How can I properly handle a collection type @QueryParam when the request includes multiple keys for the same parameter? Any guidance or examples on how to adapt the ParamConverterProvider or other relevant parts of the code would be greatly appreciated.

Thanks for your help!

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