Binary package “openjdk-6-jre-zero” in ubuntu precise

Alternative JVM for OpenJDK, using Zero/Shark

 The package provides an alternative runtime using the Zero VM and the
 Shark Just In Time Compiler (JIT). Built on architectures in addition
 to the Hotspot VM as a debugging aid for those architectures which don't
 have a Hotspot VM.
 The VM is started with the option `-zero'. See the README.Debian for details.