Probably same issue as here (resolved) : Candlepin crash after upgrade to 1.22.1
TL;DR
Temporary fix: yum downgrade java-1.8.0-openjdk-1:1.8.0.222.b10-0.el7_6.x86_64 java-1.8.0-openjdk-headless-1:1.8.0.222.b10-0.el7_6.x86_64
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