Can't change destination of symbolic link
Solution 1:
To create a symbolic link to a directory, use the 'n' option:
ln -sfn DESTINATION_DIRECTORY LINK_NAME
-
DESTINATION_DIRECTORYis the name of the link target; -
LINK_NAMEis the name of the link. - The
foption means to replace the existing link (ie, delete it first).
The n option is a bit complicated. I believe your command may have created a link to jdk1.7.0_07 inside the directory jdk1.7.0_04, via the link oracle-jdk-7 rather than replacing the link. If so, you should delete the link to avoid confusion.