Hibernate 5 hibernate-java8 jar is missing

In $JBOSS_HOME/modules/system/layers/base/org/hibernate/main are these JARs:

• hibernate-core
• hibernate-entitymanager
• hibernate-envers
  However, org.hibernate:hibernate-java8 is missing. This JAR enables the use of Instant, LocalDate, LocalDateTime LocalTime, ... being part of the new time API in JDK 8.