1) The document discusses Java versions for use on Raspberry Pi devices, noting that while Java 11 could be used its larger size may not be optimal.
2) It explores using Java 8 instead and demonstrates how to customize the Java runtime using the Liberica toolkit to reduce the size using tools like jrecreate and jlink.
3) Test results show the customized Java 8 runtime has a much smaller footprint than a default Java 11 installation and provides improved startup times using features like Application Class Data Sharing.