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To remove java 1.7 and install java 1.8:
sudo yum removeinstall java-1.78.0-openjdk sudo yum installremove java-1.87.0-openjdk
sudo yum remove java-1.7.0-openjdk sudo yum install java-1.8.0
sudo yum install java-1.8.0 sudo yum remove java-1.7.0-openjdk