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docs: document executable JAR service descriptor merging #406

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Expand Up @@ -61,6 +61,25 @@ dependencies {
}
```

### Packaging executable JARs

The query API uses gRPC and Apache Arrow Flight. If you package your application
as a single executable JAR, make sure `META-INF/services` files from dependencies
are merged instead of overwritten.

Without this, the application can work from an IDE or Maven classpath but fail
when started with `java -jar` with an error like:

```text
java.lang.IllegalArgumentException: Address types of NameResolver 'unix' ... not supported by transport
```

For the Maven Shade Plugin, add `ServicesResourceTransformer`:

```xml
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
```

## Usage

### Create client
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