Keytool is /usr/bin/keytool and points to /etc/alternatives/keytool which in turn points to /usr/lib/jvm/java-6-openjdk-i386/jre/bin/keytool.

Now I have installed java version 1.7.0_45 so I need to change keytool to the new path : /usr/lib/jvm/jdk1.7.0_45/jre/bin/keytool

I tried deleting the /usr/bin/keytool with rm -rf and then adding a new link like : sudo ln -s /usr/bin/keytool /usr/lib/jvm/jdk1.7.0_45/jre/bin/keytool but what I get is

ln: failed to create symbolic link `/usr/lib/jvm/jdk1.7.0_45/jre/bin/keytool': File exists

I also tried :

sudo update-alternatives --config keytool
There is only one alternative in link group keytool: /usr/lib/jvm/java-6-openjdk-i386/jre/bin/keytool
Nothing to configure.
update-alternatives: warning: forcing reinstallation of alternative /usr/lib/jvm/java-6-openjdk-i386/jre/bin/keytool because link group keytool is broken.

but doesn't works too.

Any suggestions ? Thank you