JDK-8178043 extends javadoc to allow module grouping and the overview summary page can be generated to have one section/table per each group.

The following patch is a prototype to separate the modules in Java SE, JDK, JavaFX groups. java.smartcardio and java.jnlp will fall into the "Other Modules" group since they are not Java SE.

The -group option for JavaFX group may need to be conditional (not sure if javadoc will generate an empty table when javafx.* modules are not present in the build).

diff --git a/make/Docs.gmk b/make/Docs.gmk
--- a/make/Docs.gmk
+++ b/make/Docs.gmk
@@ -192,6 +192,10 @@
 endef
 
 ################################################################################
+JAVA_SE_MODULES := $(strip $(subst ::,:,$(subst $(SPACE),:,$(strip java.se.ee \
+ $(call FindTransitiveDepsForModules, java.se.ee)))))
+
+################################################################################
 # Setup make rules for creating the API documentation, using javadoc and other
 # tools if needed.
 #
@@ -232,6 +236,11 @@
   $1_OPTIONS += --module-source-path $$(MODULES_SOURCE_PATH)
   $1_OPTIONS += --module $$(call CommaList, $$($1_MODULES))
 
+ # module groups
+ $1_OPTIONS += -group "Java SE" "$(JAVA_SE_MODULES)"
+ $1_OPTIONS += -group "JDK" "jdk.*"
+ $1_OPTIONS += -group "JavaFX" "javafx.*"
+
   # Create a string like "-Xdoclint:all,-syntax,-html,..."
   $1_OPTIONS += -Xdoclint:all,$$(call CommaList, $$(addprefix -, \
       $$(JAVADOC_DISABLED_DOCLINT)))