null The chosen LogFactory implementation does not extend LogFactory.  Please check your configuration.  (Caused by java.lang.ClassCastException:  The application has specified that a custom LogFactory implementation should be  used but Class 'org.apache.commons.logging.impl.LogFactoryImpl' cannot  be converted to 'org.apache.commons.logging.LogFactory'.  The conflict is caused by the presence of multiple LogFactory classes in  incompatible classloaders.  Background can be found in http://commons.apache.…

Technologies used:   JDK 1.8.0_121 | Spring 4.3.5.RELEASE | Maven 3.3.9 | Eclipse Mars.2 (4.5.2)
The @Qualifier annotation is used to resolve the autowiring conflict, when there are multiple beans of same type.
The @Qualifier annotation can be used on any class annotated with @Component or on method annotated with @Bean. This annotation can also be applied on constructor arguments or method parameters.