Now that we have Java 17 support, it would be nice to upgrade Gson to the latest version (currently 2.10.1). Version 2.10 supports Java records: https://github.com/google/gson/releases/tag/gson-parent-2.10. Records are particularly useful when used in combination with Gson for serializing/deserializing from/to DTO's.

I'm working on a new binding (openhab/openhab-addons#14222) where I have initially taken advantage of this:

@NonNullByDefault
public record ElspotpriceRecord(@SerializedName("HourUTC") Instant hour,
        @SerializedName("SpotPriceDKK") double spotPrice) {
}

However, including this Gson dependency within the binding adds more than 250 kB, which is probably not acceptable:

  <dependencies>
    <dependency>
      <groupId>com.google.code.gson</groupId>
      <artifactId>gson</artifactId>
      <version>2.10.1</version>
    </dependency>
  </dependencies>

I tried upgrading from 2.9.1 to 2.10.1 in core, but ended up with a dependency problem:

[ERROR] Failed to execute goal on project org.openhab.core.bom.compile-model: Could not resolve dependencies for project org.openhab.core.bom:org.openhab.core.bom.compile-model:pom:4.0.0-SNAPSHOT: Failed to collect dependencies at org.eclipse.xtext:org.eclipse.xtext.xbase.ide:jar:2.29.0 -> org.eclipse.xtext:org.eclipse.xtext.ide:jar:2.29.0 -> org.eclipse.lsp4j:org.eclipse.lsp4j:jar:0.19.0 -> org.eclipse.lsp4j:org.eclipse.lsp4j.generator:jar:0.19.0 -> org.eclipse.lsp4j:org.eclipse.lsp4j.jsonrpc:jar:0.19.0 -> com.google.code.gson:gson:jar:[2.9.1,2.10): No versions available for com.google.code.gson:gson:jar:[2.9.1,2.10) within specified range -> [Help 1]

I don't know how to fix this, but I'm wondering if it would be possible and acceptable to have both 2.9.1 (because of this dependency) and 2.10.1 in core? At least 2.10.1 would only be included once and all bindings could take advantage of it.