Appears as if Java 11 is default for newer images

We are seeing a build failure that occurs as part of a gradle build we run during our CI pipeline. We are seeing the following error:
```
 error: package javax.xml.bind does not exist
import javax.xml.bind.DatatypeConverter;
```
Which is typically an error seen when Java 11. We suspect that gradle is using Java 11 under the covers and wanted to confirm with you prior to digging into it.