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ant requires java-devel >= 0:1.5.0 but unfortunately java-1.8.0-openjdk-devel do NOT provides java-devel while java-1.7.0-openjdk-devel DO provide. this means even if you try to use and develop on java 8 a simple yum install ant will install java-1.7.0-openjdk-devel which is not required redundant and cause problems later. you should either drop java-devel requirement from ant or add java-devel provides to java-1.8.0-openjdk-devel.
In 7.3 java-1.8.0-openjdk-devel will (change already done) provide java-devel so your issue will be resolved. If your troubles persists after 7.3, please reopen. if you have access to prerelease of rhel7.3, fel free to try.