Strange... I am getting crazy. Just now reinstall MySQL from version 8.0.20 to version 5.6, as recommended Cloudera from Manual for installation Cloudera 5.16. The result is completely same, if driver .jar (doesn't matter version) - Unsupported major.minor version 52.0, if 5.1.49-bin.jar - Communications link failure   May be somebody provided own configuration for installation and version of JDBC driver?   I have no idea - what should be done and where must I see: Cloudera or OS CenOS or versions of the Applications? I expect some thing wrong with installation  -  but I followed the procedure from Cloudera.   ... View more