Index: trunk/build.xml
===================================================================
--- trunk/build.xml	(revision 12204)
+++ trunk/build.xml	(revision 12205)
@@ -143,4 +143,7 @@
                 <attribute name="Codebase" value="josm.openstreetmap.de"/>
                 <attribute name="Application-Name" value="JOSM - Java OpenStreetMap Editor"/>
+                <!-- Java 9 stuff. Entries are safely ignored by Java 8 -->
+                <attribute name="Add-Exports" value="java.base/sun.security.util java.base/sun.security.x509" />
+                <attribute name="Add-Opens" value="java.desktop/javax.swing.text.html" />
             </manifest>
             <zipfileset dir="images" prefix="images"/>