a jdbc auto load driver bug

FULL PRODUCT VERSION :
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
macOS Sierra 10.12.2

A DESCRIPTION OF THE PROBLEM :
In java.sql.DriverManager.loadInitialDrivers()

...
 try{
                    while(driversIterator.hasNext()) {
                        driversIterator.next();
                    }
                } catch(Throwable t) {
                // Do nothing
                }
...
When the load multiple drivers, but one loading failure.Thery are no exception log.

eg.
env:jdk7、macOS
I want to load driver: mysql-connector-java-5.1.30.jar and postgresql-42.1.3.jar
This case cannot be loaded postgresql-42.1.3.jar,because the postgresql-42.1.3.jar is compiled using jdk8.but there are no exception log








REPRODUCIBILITY :
This bug can be reproduced always.