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I have java oracle 7 installed. To build some library from the source code I do have to install openJDK 7. I don't know why they require but they do require it.

What's the safe way to install openJDK 7 when java oracle 7 is already installed?

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openjdk-7-jdk is a installable package. There is no problem with a parallel installation.

sudo apt-get install openjdk-7-jdk

And maybe you should install Oracle Java via PPA:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer
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  • @jawanam Were you satisfied with my answer? Then give me an upvote (∧). If I could solve your problem, then it would be nice if you'd mark my answer (✓). askubuntu.com/help/someone-answers ;) – A.B. Jun 20 '15 at 21:57
  • I'll upvote you :) Works perfectly with version 8 as well – pandaadb Mar 22 '17 at 12:38

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