We had to change the default version of Java used from 7 to 8. I found THIS page which gave the solution below which worked:
Switching between installed Java versions can be accomplished using the update alternatives command.
To get a list of your installed Java platforms, run the following command from the terminal:
sudo update-alternatives --config java
This will give you a list output similar to this:
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-6-oracle/jre/bin/java 1070 auto mode
1 /usr/lib/jvm/java-7-openjdk-i386/jre/bin/java 1051 manual mode
* 2 /usr/lib/jvm/java-6-openjdk-i386/jre/bin/java 1069 manual mode
Press enter to keep the current choice[*], or type selection number:
In this case, the Open JDK 6 version is running. To switch to the Open JDK version 7, you would select option 1 at the prompt and press the Enter key.
You will now be running the OpenJDK 7 version. No other changes will be needed to switch your Java versions.
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