There are rules-base/api/src/main/java/org/jboss/windup/rules/files/org/jboss/windup/rules/general/IterableFilterHandler.java and rules-base/api/src/main/java/org/jboss/windup/rules/files/org/jboss/windup/rules/general/IterableFilter.java
files.
It seems that their packages were mistyped and should be
org.jboss.windup.rules.general
instead of
org.jboss.windup.rules.files.org.jboss.windup.rules.general

rules-base/api/src/main/java/org/jboss/windup/rules/general/IterableFilterHandler.java