Re: Why can't I select the Sun Java VM ?

On Sun, 2008-11-30 at 14:06 -0300, Marcelo Magno T. Sales wrote:
Em Dom 30 Nov 2008, Linuxguy123 escreveu:
# alternatives --config java

There are 2 programs which provide 'java'.

Selection Command
-----------------------------------------------
* 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
+ 2 /usr/lib/jvm/jre-1.5.0-gcj/bin/java

So it thinks I have 2 versions of Java.

Here is the first:

# java -version
java version "1.6.0_0"
IcedTea6 1.4 (6b12-Fedora-10) Runtime Environment (build 1.6.0_0-b12)
OpenJDK Server VM (build 10.0-b19, mixed mode)

Here is the second:

# java -version
java version "1.5.0"
gij (GNU libgcj) version 4.3.2 20081105 (Red Hat 4.3.2-7)

However, I actually have 3 versions of Java, because I installed the
Sun Java from a Sun rpm:

# rpm -ql jre
/usr/java/jre1.5.0_15/CHANGES
/usr/java/jre1.5.0_15/COPYRIGHT
/usr/java/jre1.5.0_15/LICENSE
/usr/java/jre1.5.0_15/README
/usr/java/jre1.5.0_15/THIRDPARTYLICENSEREADME.txt
/usr/java/jre1.5.0_15/Welcome.html
/usr/java/jre1.5.0_15/bin
/usr/java/jre1.5.0_15/bin/ControlPanel
/usr/java/jre1.5.0_15/bin/java

If I test it it works fine.

# /usr/java/jre1.5.0_15/bin/java -version
java version "1.5.0_15"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_15-b04)
Java HotSpot(TM) Server VM (build 1.5.0_15-b04, mixed mode)

So I move it to /usr/lib/jvm and run again:

alternatives --config java

There are 2 programs which provide 'java'.

Selection Command
-----------------------------------------------
*+ 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
2 /usr/lib/jvm/jre-1.5.0-gcj/bin/java

The Sun Java doesn't show up.

/usr/lib/jvm looks like this:

ls -al
total 204
drwxr-xr-x 5 root root 4096 .
drwxr-xr-x 183 root root 139264 ..
drwxr-xr-x 3 root root 4096 java-1.5.0-gcj-1.5.0.0
drwxr-xr-x 3 root root 4096 java-1.6.0-openjdk-1.6.0.0
lrwxrwxrwx 1 root root 21 jre -> /etc/alternatives/jre
lrwxrwxrwx 1 root root 27 jre-1.5.0 ->
/etc/alternatives/jre_1.5.0 drwxr-xr-x 7 root root 4096
jre1.5.0_15
lrwxrwxrwx 1 root root 26 jre-1.5.0-gcj ->
java-1.5.0-gcj-1.5.0.0/jre
lrwxrwxrwx 1 root root 27 jre-1.6.0 ->
/etc/alternatives/jre_1.6.0 lrwxrwxrwx 1 root root 30
jre-1.6.0-openjdk ->
java-1.6.0-openjdk-1.6.0.0/jre
lrwxrwxrwx 1 root root 25 jre-gcj -> /etc/alternatives/jre_gcj
lrwxrwxrwx 1 root root 29 jre-openjdk
-> /etc/alternatives/jre_openjdk

How do I get the Sun java to be the default Java, without doing a 24
step build that Googling finds ?

You must register the new java alternative with the alternatives command
first. Just type in as root in a terminal window:
alternatives --­­install /usr/bin/java java /opt/jre1.6.0/bin/java 3
alternatives --config java

Thanks for the reply Marcelo.


And select the one you want to be the default. Replace
"/opt/jre1.6.0/bin/" with the path where you have decompressed Sun's
java binaries.
I've read a long time ago that we shouldn't install Sun's Java RPM in
Fedora, because it would overwrite some files of GCJ.

Interesting.


When you update
GCJ the next time, it will overwrite back the Sun's files. I don't know
for sure if this was correct or if it is still the case but maybe, just
to be safe, you should download the non-rpm package from Sun and
decompress it manually in /opt or other directory you like.
If any one knows if it's still not recommended to install Sun's Java RPM
package, please let us know.

I wasn't aware of this. Maybe it the problem with my Eclipse install.

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