JAVA : problem with gcj

[skaboss]

Hello,

I installed Sun's JDK via apt and Tomcat 4 manually. Was very happy with it, and then had the very bad idea to install Tomcat 5 via apt...

Some java appz won't work anymore, and when i type

java -version, i get

java version "1.4.2"
gij (GNU libgcj) version 4.1.0 (Ubuntu 4.1.0-1ubuntu8)

Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

in place of my wonderful Sun's jdk 5.0 :cry:

When i try to purge gcj and all that messy stuff, i meet dependancies problems....

Please, how can i get out of this hell and revert to Sun's jdk ?

[kaamos]

sudo update-alternatives --config java

[meng]

https://help.ubuntu.com/community/Java
Look at Selecting the default java version, see if that works for you.

[skaboss]

Thanks a lot guys !

This one


sudo update-alternatives --config java

worked perfect =D>

[hod139]

Thanks a lot guys !

This one


sudo update-alternatives --config java
worked perfect =D>

You really shouldn't be using that. You should be using:

sudo update-java-alternatives -s java-1.5.0-sun

[skaboss]

Heeeellllpppp !!!

I followed the instructions above. It works fine, but everytime i restart my system, the infamous libgcj and friends take precedence over Sun's java.
Please, how to get out from this permanently ?

[skaboss]

Ok, i finally solved this problem, putting /usr/lib/jvm/java-1.5.0-sun at the very beginning of the path in /etc/environment.
Don't know if this is the best way to get rid of gcj, but at least it works.

Still i can't make Tomcat start at system boot (i have to start it manually via "sudo /etc/init.d/tomcat5 start"), although it seems to be correctly configured in the various /etc/rc links.

Any clue ?

[ifokkema]

Regarding to Tomcat; any errors in it's error log?

[skaboss]

Actually, no entry at all in tomcat's logs until i start it manually, which makes me think of something like tomcat can't find java in the path at boot up time, but finds it when i launch it manually...
Do you know of a way to set up the path correctly ?

[ifokkema]

That should leave errors in the syslog / dmesg... I think. Anything useful in there?

[skaboss]

Thank you for your answer, but no, nothing related to tomcat nor java... :confused:

[ifokkema]

Hmm... My theory is, since that your problem started with the system using the wrong version of Java, that the problem is not that the when starting Tomcat at boot time, it can't find Java. I think that maybe it's not configured to start automatically...
What's the output of:

find /etc/rc?.d/ -iname \*tomcat\*

[skaboss]

Thanks a lot for your patience.
Here is what i get :

landry@AlBundy:~$ find /etc/rc?.d/ -iname \*tomcat\*
/etc/rc0.d/K20tomcat
/etc/rc0.d/K20tomcat5
/etc/rc1.d/K20tomcat
/etc/rc1.d/K20tomcat5
/etc/rc2.d/K20tomcat
/etc/rc2.d/S20tomcat5
/etc/rc3.d/K20tomcat
/etc/rc3.d/S20tomcat5
/etc/rc4.d/K20tomcat
/etc/rc4.d/S20tomcat5
/etc/rc5.d/K20tomcat
/etc/rc5.d/S20tomcat5
/etc/rc6.d/K20tomcat
/etc/rc6.d/K20tomcat5
landry@AlBundy:~$

[ifokkema]

Well.. let's see. Just a guess:
You're in runlevel 2 (Ubuntu default). The system should start tomcat5, but stop tomcat. Maybe they interfere.

What if you:

sudo mv /etc/rc2.d/K20tomcat /etc/rc2.d/__K20tomcat
and reboot?

[ynef]

Ok, i finally solved this problem, putting /usr/lib/jvm/java-1.5.0-sun at the very beginning of the path in /etc/environment.
Don't know if this is the best way to get rid of gcj, but at least it works.

I think the correct way to do this is to put it at the top of the file /etc/jvm

[skaboss]

Well.. let's see. Just a guess:
You're in runlevel 2 (Ubuntu default). The system should start tomcat5, but stop tomcat. Maybe they interfere.

What if you:

sudo mv /etc/rc2.d/K20tomcat /etc/rc2.d/__K20tomcat
and reboot?

nothing : still no tomcat after reboot...

[skaboss]

I think the correct way to do this is to put it at the top of the file /etc/jvm

I already did this, without effect : that's why i changed the path directly.

[ifokkema]

nothing : still no tomcat after reboot...
Wow... quickly running out of ideas here...

This is the last I can think of:
- The /etc/rc2.d/S20tomcat5 script is not linked to the correct script.

ls -lah /etc/rc2.d/S20tomcat5
to check.
- It's indeed, as you suggested, a path problem. Usually, though, these scripts do not rely on any path setting and directly call the executables using the full path. But since this is my last idea: you might as well try to dig in your /etc/init.d/tomcat5 to see what it's doing. It's a bash script. Check for the executable it should start up and make sure the correct paths are added (you may want to create a backup of this script).

Good luck!

[LordHunter317]

I'm pretty sure tomcat won't start without editing /etc/default/tomcat5 if you installed it from packages.

[skaboss]

Thank you very much for your great help. My problem is solved !
First, as you mentioned, ifokkema, i edited /etc/init.d/tomcat5 and changed the path there : it worked all right !
After your post, LordHunter317, i restored /etc/init.d/tomcat5, and edited /etc/default/tomcat5, and just put JAVA_HOME, and now tomcat will start at boot.
There's only one mystery left : why do i have to define JAVA_HOME in /etc/default/tomcat5, when it is already defined in the path (echo $JAVA_HOME returns the correct path) ?

[LordHunter317]

There's only one mystery left : why do i have to define JAVA_HOME in /etc/default/tomcat5, when it is already defined in the path (echo $JAVA_HOME returns the correct path) ?I forget the exact reasoning, but the tomcat5 startup process does a bunch of wierd stuff with the environment. Also, I didn't read the thread, but if you defined JAVA_HOME /etc/profile or /etc/bash.bashrc, neither are read when init scripts are run.