says it's 1.4 as well.
[root@kindle us]# java -showversion
Product: Sun CDC Java Client phoneme_advanced-Core-1.3-b03 A2Z-SOW2-CR2-20100225-b01 (built on 01/Sep/2012 14:24 PDT)
Profile: Personal Basis Profile (Security Optional Package) 1.1.2 (Specification 1.1.2)
JVM: phoneme_advanced-Core-1.3-b03 A2Z-SOW2-CR2-20100225-b01 (mixed mode)
he uses a mod to make it use some of the 1.5 stuff..
Retroweaver integration, allowing Java 1.5 language features (generics! autoboxing! foreach loops!) on the Kindle's 1.4 JVM.
com.cowlark.eventbus, a port of GWT's excellent event bus system, and a wrapper around the Kindle lifecycle APIs so that we don't need to worry about what thread they're calling into our application from.