Hortonworks from HDP 2.6.3 do not support JDK7 it’s due to due to end of life of JDK7
Hortonworks support Matrices for HDP 2.6.0
Horonworks document for upgrading to JDK8
Cloudera document for upgrading to JDK8 cdh_cm_upgrading_to_jdk81
Hortonworks from HDP 2.6.3 do not support JDK7 it’s due to due to end of life of JDK7
Hortonworks support Matrices for HDP 2.6.0
Horonworks document for upgrading to JDK8
Cloudera document for upgrading to JDK8 cdh_cm_upgrading_to_jdk81