alternatives for java_sdk?

[Caitlyn O'Hanna]

I've encountered some oddities with the way that java is setup on my F10
system while trying to learn some java stuff.  When I try to run `mvn
jetty:run` I get the following exception over and over:

"""
java.lang.ClassCastException: gnu.java.nio.ServerSocketChannelImpl
cannot be cast to java.nio.channels.SocketChannel
"""

I've traced that back to '/usr/lib/jvm/java' pointing to
'/etc/alternatives/java_sdk' and that pointing to
'/usr/lib/jvm/java-1.5.0-gcj'.  When I do a `alternatives --config java`
it shows '/usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java'. Typing `java
-version` shows the correct version, but `/usr/lib/jvm/java/jre/bin/java
-version` shows 1.5.0.  On my F9 system the last command shows 1.6.0.  I
do have JPackage 5.0 (generic) stuff installed on both systems, and I
have it set as an enabled repository normally.

I've tried `alternatives --set
java_sdk /usr/lib/jvm/jre-1.6.0-openjdk.x86_64`, which is the path my F9
system is showing, but that didn't work.

Anyone have any ideas why this is set this way and how to fix it other
than manually changing the symlinks?

Thanks!

--Caitlyn

[Kevin Kofler]

Caitlyn O'Hanna wrote:
> Anyone have any ideas why this is set this way and how to fix it other
> than manually changing the symlinks?

Try system-switch-java.

Kevin Kofler

[Caitlyn O'Hanna]

On Tue, 2008-12-30 at 15:56 +0100, Kevin Kofler wrote:
> Caitlyn O'Hanna wrote:
> > Anyone have any ideas why this is set this way and how to fix it other
> > than manually changing the symlinks?
>
> Try system-switch-java.
>     Kevin Kofler

That doesn't seem to have helped.  Looking in '/etc/alternatives' it
looks like it did touch java_sdk, but it is using gcj for both sets.
I've attached the output of `ls -Al /etc/alternatives` while using
either setting and the diff of the two so that one can see what it's
doing at a glance.

While I had been thinking about it early this morning, I do recall that
installing tomcat6 and deps with JPackage 5.0 enabled does change some
things in '/etc/alternatives'.  I'll probably be trying to uninstall all
of that to see if that helps.

Thanks though :)

--Caitlyn

[Dan Thurman]

Caitlyn O'Hanna wrote:
> On Tue, 2008-12-30 at 15:56 +0100, Kevin Kofler wrote:
> > Caitlyn O'Hanna wrote:
> > > Anyone have any ideas why this is set this way and how to fix it other
> > > than manually changing the symlinks?
> >
> > Try system-switch-java.
> >     Kevin Kofler
>
> That doesn't seem to have helped.  Looking in '/etc/alternatives' it
> looks like it did touch java_sdk, but it is using gcj for both sets.
> I've attached the output of `ls -Al /etc/alternatives` while using
> either setting and the diff of the two so that one can see what it's
> doing at a glance.
>
> While I had been thinking about it early this morning, I do recall that
> installing tomcat6 and deps with JPackage 5.0 enabled does change some
> things in '/etc/alternatives'.  I'll probably be trying to uninstall all
> of that to see if that helps.
>
> Thanks though :)
>
> --Caitlyn

Just a tip, use galternative - it is a lot simpler imho.

alternatives for java_sdk? [Solved]

[Caitlyn O'Hanna]

On Tue, 2008-12-30 at 19:19 -0800, Daniel B. Thurman wrote:
> > > Caitlyn O'Hanna wrote:
> > > > Anyone have any ideas why this is set this way and how to fix it other
> > > > than manually changing the symlinks?

So it was simpler than I was making it out to be.  It helps to have
java-1.6.0-openjdk-devel installed :)  Yum had been defaulting to
installing java-1.5.0-gcj-devel whenever something was requiring
java-sdk, not OpenJDK's SDK.

On the bright side, I now know a couple of new ways of changing
alternatives...

--Caitlyn