houdini@mozart:~$ dpkg -l | grep java
ii  ca-certificates-java                 20100412                                          Common CA certificates (JKS keystore)
ii  java-common                          0.38                                              Base of all Java packages
rc  libaccess-bridge-java-jni            1.26.2-5                                          Java Access Bridge for GNOME (jni bindings)
ii  plasma-scriptengine-javascript       4:4.5.1-0ubuntu3.1                                the JavaScript script engine for Plasma
ii  tzdata-java                          2010m-0ubuntu0.10.10                              time zone and daylight-saving time data for use by java runtimes
houdini@mozart:~$ dpkg -l | grep jdk
rc  openjdk-6-jre                        6b20-1.9-0ubuntu1                                 OpenJDK Java runtime, using Hotspot JIT
ii  openjdk-6-jre-headless               6b20-1.9-0ubuntu1                                 OpenJDK Java runtime, using Hotspot JIT (headless)
ii  openjdk-6-jre-lib                    6b20-1.9-0ubuntu1                                 OpenJDK Java runtime (architecture independent libraries)