log.debugf( "Unable to locate Class [%s] using TCCL, falling back to HCANN ClassLoader" );
There should be a second parameter (className), otherwise the following exception occurs:
java.util.MissingFormatArgumentException: Format specifier 's'
at java.util.Formatter.format(Formatter.java:2487)
at java.util.Formatter.format(Formatter.java:2423)
at java.lang.String.format(String.java:2797)
at org.jboss.logging.Slf4jLocationAwareLogger.doLogf(Slf4jLocationAwareLogger.java:81)
at org.jboss.logging.Logger.debugf(Logger.java:553)
at org.hibernate.annotations.common.util.StandardClassLoaderDelegateImpl.classForName(StandardClassLoaderDelegateImpl.java:53)