db46 requires java development headers

[enoble@…]

Dear Macports
I keep getting the following error when I try to install ncview. i have been getting this error for 6 months now.
Could I have some help?
Thank you.

[ 12:21:03 ] > sudo port install ncview
Password:
--->  Computing dependencies for ncview
--->  Dependencies to be installed: xorg-libXaw xorg-libXext xorg-libX11 xorg-libxcb python26 db46 gdbm readline sqlite3 xorg-libpthread-stubs xorg-xcb-proto xorg-util-macros xorg-xcmiscproto xorg-xextproto xorg-xf86bigfontproto xorg-xtrans xorg-libXmu xorg-libXt xorg-libsm xorg-libice xpm
--->  Configuring db46
Error: db46 requires the Java for Mac OS X development headers.
Error: Download the Java Developer Package from: <https://connect.apple.com/cgi-bin/WebObjects/MemberSite.woa/wa/getSoftware?bundleID=20719>
Error: Target org.macports.configure returned: missing Java headers
Error: Failed to install db46
Log for db46 is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_databases_db46/main.log
Error: The following dependencies were not installed: xorg-libXaw xorg-libXext xorg-libX11 xorg-libxcb python26 db46 gdbm readline sqlite3 xorg-libpthread-stubs xorg-xcb-proto xorg-util-macros xorg-xcmiscproto xorg-xextproto xorg-xf86bigfontproto xorg-xtrans xorg-libXmu xorg-libXt xorg-libsm xorg-libice xpm
Error: Status 1 encountered during processing.
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