[CentOS] Java installation problem. -- Alternatives ...

[Matt Hyclak]

On Sun, Aug 07, 2005 at 05:54:16PM -0500, Jay Leafey enlightened us:
> I don't know if this is much use, but here's the command I used to add 
> the Sun JDK to alternatives after I installed the RPM (look out for line 
> wrap):
> 
> alternatives \
>     --install /usr/bin/java java /usr/java/jdk1.5.0_04/jre/bin/java 10 \
>     --slave /usr/bin/rmiregistry rmiregistry \
>         /usr/java/jdk1.5.0_04/jre/bin/rmiregistry \
>     --slave /usr/lib/jvm/jre jre /usr/java/jdk1.5.0_04/jre
> 
> This sets all of the slaves except jre_exports, which I could not seem 
> to find in the Sun JDK.  Anybody got any ideas on what this should 
> actually point to?
> 
> Anyway, I then used the command 'alternatives --set java 
> /usr/java/jdk1.5.0_04/jre/bin/java' to switch over to using the Sun 
> Java.  Heres what the alternatives output looks like afterwards:
> 
> [root at jaybird ~]# alternatives --display java
> java - status is manual.
>  link currently points to /usr/java/jdk1.5.0_04/jre/bin/java
> /usr/lib/jvm/jre-1.4.2-gcj/bin/java - priority 1420
>  slave rmiregistry: /usr/lib/jvm/jre-1.4.2-gcj/bin/rmiregistry
>  slave jre_exports: /usr/lib/jvm-exports/jre-1.4.2-gcj
>  slave jre: /usr/lib/jvm/jre-1.4.2-gcj
> /usr/java/jdk1.5.0_04/jre/bin/java - priority 10
>  slave rmiregistry: /usr/java/jdk1.5.0_04/jre/bin/rmiregistry
>  slave jre_exports: (null)
>  slave jre: /usr/java/jdk1.5.0_04/jre
> Current `best' version is /usr/lib/jvm/jre-1.4.2-gcj/bin/java.
> [root at jaybird ~]# java -version
> java version "1.5.0_04"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_04-b05)
> Java HotSpot(TM) Client VM (build 1.5.0_04-b05, mixed mode, sharing)
> 
> The reason the GCJ version shows up as the 'best' is because it has a 
> higher priority (1420) than the Sun version (10).  Just change the 
> priority in the 'alternatives --install' command listed above to 
> something higher than 1420 and the Sun version will become the 'best' 
> version.
> 
> Just my $.02.

The jpackage.org folks take things even further. Check their spec file, but
it results in:

[hyclak at euclid ~]$ /usr/sbin/alternatives --display java
java - status is auto.
 link currently points to /usr/lib/jvm/jre-1.5.0-sun/bin/java
/usr/lib/jvm/jre-1.4.2-gcj/bin/java - priority 1420
 slave keytool: (null)
 slave orbd: (null)
 slave policytool: (null)
 slave rmid: (null)
 slave rmiregistry: /usr/lib/jvm/jre-1.4.2-gcj/bin/rmiregistry
 slave servertool: (null)
 slave tnameserv: (null)
 slave jre_exports: /usr/lib/jvm-exports/jre-1.4.2-gcj
 slave jre: /usr/lib/jvm/jre-1.4.2-gcj
 slave java.1.gz: (null)
 slave keytool.1.gz: (null)
 slave kinit.1.gz: (null)
 slave klist.1.gz: (null)
 slave ktab.1.gz: (null)
 slave orbd.1.gz: (null)
 slave policytool.1.gz: (null)
 slave rmid.1.gz: (null)
 slave rmiregistry.1.gz: (null)
 slave servertool.1.gz: (null)
 slave tnameserv.1.gz: (null)
/usr/lib/jvm/jre-1.5.0-sun/bin/java - priority 1503
 slave keytool: /usr/lib/jvm/jre-1.5.0-sun/bin/keytool
 slave orbd: /usr/lib/jvm/jre-1.5.0-sun/bin/orbd
 slave policytool: /usr/lib/jvm/jre-1.5.0-sun/bin/policytool
 slave rmid: /usr/lib/jvm/jre-1.5.0-sun/bin/rmid
 slave rmiregistry: /usr/lib/jvm/jre-1.5.0-sun/bin/rmiregistry
 slave servertool: /usr/lib/jvm/jre-1.5.0-sun/bin/servertool
 slave tnameserv: /usr/lib/jvm/jre-1.5.0-sun/bin/tnameserv
 slave jre_exports: /usr/lib/jvm-exports/jre-1.5.0-sun
 slave jre: /usr/lib/jvm/jre-1.5.0-sun
 slave java.1.gz: /usr/share/man/man1/java-java-1.5.0-sun.1.gz
 slave keytool.1.gz: /usr/share/man/man1/keytool-java-1.5.0-sun.1.gz
 slave kinit.1.gz: /usr/share/man/man1/kinit-java-1.5.0-sun.1.gz
 slave klist.1.gz: /usr/share/man/man1/klist-java-1.5.0-sun.1.gz
 slave ktab.1.gz: /usr/share/man/man1/ktab-java-1.5.0-sun.1.gz
 slave orbd.1.gz: /usr/share/man/man1/orbd-java-1.5.0-sun.1.gz
 slave policytool.1.gz: /usr/share/man/man1/policytool-java-1.5.0-sun.1.gz
 slave rmid.1.gz: /usr/share/man/man1/rmid-java-1.5.0-sun.1.gz
 slave rmiregistry.1.gz: /usr/share/man/man1/rmiregistry-java-1.5.0-sun.1.gz
 slave servertool.1.gz: /usr/share/man/man1/servertool-java-1.5.0-sun.1.gz
 slave tnameserv.1.gz: /usr/share/man/man1/tnameserv-java-1.5.0-sun.1.gz
Current best' version is /usr/lib/jvm/jre-1.5.0-sun/bin/java.

Matt

-- 
Matt Hyclak
Department of Mathematics 
Department of Social Work
Ohio University
(740) 593-1263
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