You will notice a big change when selecting options if you type in “java -version” after doing so. So if you run update-alternatives --config java
and select option 3
, you will be using the Sun implementation.
Also, with regards to auto
vs manual mode
, making a selection should take it out of auto mode
per this page stating:
When using the
--config
option, alternatives will list all of the
choices for the link group of which given name is the master link. You
will then be prompted for which of the choices to use for the link
group. Once you make a change, the link group will no longer be in
auto mode
. You will need to use the--auto
option in order to return
to the automatic state.
And I believe auto mode
is set when you install the first/only JRE/JDK.