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[clacke <launchpad@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

This is still a problem in openjdk-6 6b18~pre1-1ubuntu1. Installing
default-jdk-builddep forces a gcj install even though openjdk-6-jdk is
already installed.

-- 
Inconsistent 'Provides' for different java compilers/runtimes
https://bugs.launchpad.net/bugs/189953
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Status in “icedtea-java7” package in Ubuntu: Invalid
Status in “openjdk-6” package in Ubuntu: Fix Released

Bug description:
Following are values for 'Provides' field for different java compilers/runtimes.

icedtea-java7-jdk - java-sdk, java2-sdk, java5-sdk, java6-sdk, java7-sdk
icedtea-java7-jre - java-runtime, java2-runtime, java5-runtime, java6-runtime, java7-runtime
sun-java5-jdk - java-compiler, java2-compiler
sun-java5-jre - java-runtime, java-runtime-headless, java2-runtime, java2-runtime-headless, java5-runtime, java5-runtime-headless, java-virtual-machine
sun-java6-jdk - java-compiler, java2-compiler
sun-java6-jre - java-runtime, java-runtime-headless, java2-runtime, java2-runtime-headless, java5-runtime, java5-runtime-headless, java6-runtime, java6-runtime-headless, java-virtual-machine
gcj-4.2 - java-compiler
gij-4.2 - java-runtime-headless, java1-runtime-headless, java2-runtime-headless, java5-runtime-headless, java-virtual-machine
kaffe - Doesn't have a 'Provides' field
jikes - Doesn't have a 'Provides' field
sablevm - java-runtime, java1-runtime, java-virtual-machine

As per my understanding
java-compiler - just a compiler without a VM ex. jikes
java-virtual-machine - just a VM without a compiler ex. sablevm
java-runtime - compiler + VM. 

Irrespective of whether my understanding is correct or not there has to be a consistency. Specifically icedtea-java7-jdk is out of sync with other compilers like Sun, GCJ.