Add the jdk javadoc path to the link path for javadoc.
Index: fontchooser-1.0.0/nbproject/build-impl.xml
===================================================================
--- fontchooser-1.0.0.orig/nbproject/build-impl.xml	2010-11-10 22:37:52.724444061 +0000
+++ fontchooser-1.0.0/nbproject/build-impl.xml	2010-11-10 22:38:38.705277310 +0000
@@ -489,6 +489,7 @@
             <fileset dir="${src.dir}" excludes="${excludes}" includes="${includes}">
                 <filename name="**/*.java"/>
             </fileset>
+            <link href="/usr/share/doc/default-jdk-doc/api" />
         </javadoc>
     </target>
     <target depends="init,-javadoc-build" if="netbeans.home" name="-javadoc-browse" unless="no.javadoc.preview">
