Question 1

How to add a custom date scalar in GraphQL Java?

Accepted Answer

Use the DateTime scalar from the library, register it in RuntimeWiring, and define it in your schema with the @specifiedBy directive pointing to the RFC-3339 specification URL for compliance.

Question 2

What's the difference between DateTime and SecondsSinceEpoch scalars?

Accepted Answer

DateTime uses RFC-3339 strings for human-readable dates and times, while SecondsSinceEpoch uses integers for Unix timestamps, offering a compact but less readable format suitable for time-series data.

Question 3

How to create a regex-validated scalar with graphql-java-extended-scalars?

Accepted Answer

Use the RegexScalar builder by providing one or more regex patterns, then register the new scalar in your runtime wiring, as demonstrated in the README's phone number example.

Question 4

Does this library work with Spring Boot GraphQL?

Accepted Answer

Yes, you can register scalars via a RuntimeWiringConfigurer in Spring for GraphQL, as detailed in the configuration section for seamless integration.

Question 5

Can I use extended scalars for email validation?

Accepted Answer

While not included out-of-the-box, you can create a custom scalar using the RegexScalar builder with an appropriate email regex pattern to enforce validation in your schema.

Question 6

How to handle JSON data in GraphQL with this library?

Accepted Answer

Use the Object or JSON scalars sparingly, as they allow unstructured data but are cautioned against in the README because they conflict with GraphQL's type-safe design principles.

Question 7

What versions of graphql-java are supported?

Accepted Answer

The library has specific version mappings; for example, use version 24.0 for graphql-java 24.x, as per the installation notes, to avoid compatibility issues and ensure smooth operation.

graphql-java-extended-scalars

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