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Is it necessary to have openjdk 6 installed in Ubuntu 12.04 or will openjdk 7 provide all the support I will need for Java functionality (generally speaking)?

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up vote 3 down vote accepted

As you can see in this picture the OpenJDK 6 and 7 share some code base:

enter image description here

OpenJDK 7 implement newer features, while OpenJDK 6 is more used and therefore perhaps more stable.

Also here is the OpenJDK FAQ.

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