FULL PRODUCT VERSION :
java version "9"
Java(TM) SE Runtime Environment (build 9+178)
Java HotSpot(TM) 64-Bit Server VM (build 9+178, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows 10.0.15063
Arch Linux

A DESCRIPTION OF THE PROBLEM :
When using javadoc bundled in jdk-9, only last -link will have effect. Only links pointing the last link provided will be generated.

REGRESSION. Last worked in version 8u152

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Open a java project and try to generate javadoc with more than two -link options passed to it.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
All -link options provided come to effect and links to the javadocs listed in -link options generated properly.
ACTUAL -
Only links pointing the last link provided will be generated.

REPRODUCIBILITY :
This bug can be reproduced always.