Most of the Big Data stack technologies would work with Java 1.7 or Java 7 which is installed by default in CentOS 7 Server UI Edition. If not follow the instruction as described in How to install Java 7 and Java 8 in CentOS 7?
Some technologies require Java 1.8 or 8. For example the Gremlin Server from Titan Graph requires Java 8. Once we have installed Java 8 we can switch the default Java version to 8 for those technologies that required Java 8 as the default.
We can attempt to run technologies that require both Java 7 and Java 8 on the same box by using the different user login each having different Java home path but this is not recommended. Try to stick to technologies that run with the same Java version per server.
Do the following command. You would need to be an administrator.
Some technologies require Java 1.8 or 8. For example the Gremlin Server from Titan Graph requires Java 8. Once we have installed Java 8 we can switch the default Java version to 8 for those technologies that required Java 8 as the default.
We can attempt to run technologies that require both Java 7 and Java 8 on the same box by using the different user login each having different Java home path but this is not recommended. Try to stick to technologies that run with the same Java version per server.
Do the following command. You would need to be an administrator.
sudo update-alternatives --config java
There are 2 programs which provide 'java'.
Selection Command
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* 1 /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75-2.5.4.2.el7_0.x86_64/jre/bin/java
+ 2 /usr/java/jdk1.8.0_60/jre/bin/java
Enter to keep the current selection[+], or type selection number:
The current selection is displayed in +. To change it
Type 1 and press enter to switch to Java 7
Type 2 and press enter to switch to Java 8.
Type 1 and press enter to switch to Java 7
Type 2 and press enter to switch to Java 8.
To exist without changing press "enter".
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