[gentoo-user] How to invoke non-selected versions of 'java'?

[gentoo-user] How to invoke non-selected versions of 'java'?

[Grant Edwards]

I've got two "slots" of java currently installed (8 and 11). I see how
one uses "eselect java" to contol which one is invoked by /usr/bin/java.

How does one manually invoke non-selected version(s) of java?

For other slotted things like gcc and python, you can use pythonX.Y or
gcc-X.Y.Z to invoke the non-selected version.

What's the equivalent for java?

--
Grant

Re: [gentoo-user] How to invoke non-selected versions of 'java'?

[Arve Barsnes]

On Fri, 4 Feb 2022 at 22:49, Grant Edwards <grant.b.edwards@gmail.com> wrote:
>
> I've got two "slots" of java currently installed (8 and 11). I see how
> one uses "eselect java" to contol which one is invoked by /usr/bin/java.
>
> How does one manually invoke non-selected version(s) of java?
>
> For other slotted things like gcc and python, you can use pythonX.Y or
> gcc-X.Y.Z to invoke the non-selected version.
>
> What's the equivalent for java?

I don't think there is any convenient out of the box link like for
python or gcc, but you could make equivalent links if you want.
Otherwise you should use the paths in your commands. On this box I
have:

/usr/lib64/openjdk-8/bin/java
/usr/lib64/openjdk-11/bin/java

Regards,
Arve

[gentoo-user] Re: How to invoke non-selected versions of 'java'?

[Grant Edwards]

On 2022-02-04, Arve Barsnes <arve.barsnes@gmail.com> wrote:
> On Fri, 4 Feb 2022 at 22:49, Grant Edwards <grant.b.edwards@gmail.com> wrote:
>>
>> I've got two "slots" of java currently installed (8 and 11). 
>> [...]
>> How does one manually invoke non-selected version(s) of java?
>> [...]
>
> I don't think there is any convenient out of the box link like for
> python or gcc,

That was what I concluded, but I was a bit surprised.

> but you could make equivalent links if you want.  Otherwise you
> should use the paths in your commands. On this box I have:
>
> /usr/lib64/openjdk-8/bin/java
> /usr/lib64/openjdk-11/bin/java

Yep. I've currently got '-bin' versions installed so here it's:

$ find /opt/{icedtea*,openjdk*} -type f -executable -name 'java'
/opt/icedtea-bin-3.16.0/jre/bin/java
/opt/icedtea-bin-3.16.0/bin/java
/opt/openjdk-bin-11.0.14_p9/bin/java

Re: [gentoo-user] Re: How to invoke non-selected versions of 'java'?

[Arve Barsnes]

On Sat, 5 Feb 2022 at 00:48, Grant Edwards <grant.b.edwards@gmail.com> wrote:
> Yep. I've currently got '-bin' versions installed so here it's:
>
> $ find /opt/{icedtea*,openjdk*} -type f -executable -name 'java'
> /opt/icedtea-bin-3.16.0/jre/bin/java
> /opt/icedtea-bin-3.16.0/bin/java
> /opt/openjdk-bin-11.0.14_p9/bin/java

You should also have the /opt/openjdk-bin-11 symbolic link, so the bin
versions also have a "permanent" path to use in your commands. They're
not in your path since it is the folder names that are versioned, and
not the executables.

Regards,
Arve