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For DSpace 6.x, you can use Java 8.
For DSpace 5.x, you should be using Java 7. Unfortunately even disabling `doclint` on these branches seems to not be enough (See 

• If you are using a recent version of Ubuntu

(e.g. 16.04LTS or later)

• , OpenJDK 7 is harder and harder to find. However, there are still some PPAs that have unmaintained copies (i.e. no security patches). This is good enough for installing on something like vagrant-dspace just do perform the release. Here's a PPA that has worked (as of July 2017):

  Code Block

  # Install the add-apt-repository command (if not available) sudo apt install software-properties-common # Add a PPA that has old 7 versions of OpenJDK sudo add-apt-repository ppa:openjdk-r/ppa sudo apt-get update # Install OpenJDK 7 sudo apt-get install openjdk-7-jdk # Switch which Java alternative is in use (and select OpenJDK 7) # OBVIOUSLY, YOU SHOULD MAKE SURE TO SWITCH BACK AFTER THE RELEASE IS COMPLETE update-alternatives --config java # Check that the settings are now correct java -version

  
  

Use Maven 3 or above

Make sure you're using a recent version of Maven. As of this writing, Maven 3.0.5 is known to work.

For more information see the Prerequisites section of the Sonatype Maven Repository Usage Guide

For DSpace 7.x, you must use Maven 3.3 or above.  However, Maven 3.5.4 or above is highly recommended, as it's necessary to regenerate the LICENSES_THIRD_PARTY file (see notes below)

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• dspace-api-lang   - Check if any new commits have occurred on 'dspace-api-lang' since the last release. (Also required for 7.x and above!)
• dspace-xmlui-lang - Check if any new commits have occurred on 'dspace-xmlui-lang' since the last release. (For v6.x or below only)

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