Blueprint processor is crashing on startup with the following exception:

Caused by: java.lang.IllegalArgumentException: LoggerFactory is not a Logback LoggerContext but Logback is on the classpath. Either remove Logback or the competing implementation (class org.slf4j.impl.SimpleLoggerFactory loaded from file:/opt/app/onap/lib/org.slf4j-slf4j-simple-1.7.25.jar). If you are using WebLogic you will need to add 'org.slf4j' to prefer-application-packages in WEB-INF/weblogic.xml: org.slf4j.impl.SimpleLoggerFactory

Problem appears to be that there are 2 loggers in the class path (logback and simple logger). One needs to be removed.