Database connection error found:

[2019-05-02T16:39:09.468+00:00|ERROR|CountRecentOperationsPip|qtp298430307-22] Persistence failed Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.7.0.v20170811-d680af5): org.eclipse
Internal Exception: java.sql.SQLNonTransientConnectionException: Could not connect to address=(host=mariadb)(port=3306)(type=master) : mariadb 
Error Code: -1 operations history db {} 
javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.7.0.v20170811-d680af5): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLNonTransientConnectionException: Could not connect to address=(host=mariadb)(port=3306)(type=master) : mariadb 
Error Code: -1 
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:844)