I spent 2 days cracking my head on this before I finally saw the light...
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Installation HOW-TO
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1. Remove Apache, Kaffe and the JDK 1.0x that comes with the standard COL2.2 distribution.
# rpm -e apache
# rpm -e kaffe
# rpm -e jdk-static
# rpm -e jdk

2. Apply OS upgrades and security patches (see Caldera's site for latest stuff)

3. Download the following :
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Apache 1.3.6    
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ftp://ftp.calderasystems.com/pub/contrib/RPMS/libc6
Files to download : 
apache-1.3.6-3.i386.rpm
apache-devel-1.3.6-3.i386.rpm
apache-docs-1.3.6-3.i386.rpm

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Apache JServ 1.0 final
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http://java.apache.org
Files to download :
(I'm sure you know, since you're looking at this message)

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Java Development Kit
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http://www.blackdown.org
Files to download :
jdk1.1.7v3 (green threads)

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Java Servlet Development Kit
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http://www.javasoft.com
Files to download
jsdk version 2.0 (NOT 2.1 ! Very important !)

4. Install Apache 1.3.6 RPMs
Files to be installed :
# rpm -i apache-1.3.6-3.i386.rpm
# rpm -i apache-devel-1.3.6-3.i386.rpm
# rpm -i apache-docs-1.3.6-3.i386.rpm

Apache will be started automatically after the install


5. Install JDK117v3

# tar -zxvf jdk_filename

Add into /etc/profile
export PATH=/path/to/jdk/bin:$PATH

Test JDK by typing "java -version"

6. Install JSDK2.0

# tar -zxvf jsdk_filename

Add into /etc/profile
export PATH=/path/to/jsdk/bin:$PATH
JAVA_HOME=/path/to/jdk
JSDK_HOME=/path/to/jsdk

Test JSDK by typing "servletrunner" (Note : Apache MUST be running). Then surf to this URL : http://localhost:8080/servlet/SimpleServlet
You should see a Simple Servlet HTML page

7. Finally, install Apache JServ
for DSO
# tar -zxvf Apache_JServ_1.0.tar.gz
# cd ApacheJServ-1.0
# ./configure --with-apache-install=/usr \
              --prefix=/usr/local/jserv \
              --enable-apache-conf \
              --with-jsdk=/path/to/jsdk
# make
# make install

8. Create directory 
# cd /etc/httpd
# mkdir modules

9. Copy mod_jserv
# cp /path/to/ApacheJServ-10/src/c/mod_jserv.so /etc/httpd/modules

10. Edit the httpd.conf file
Look for the 'LoadModules' statements, and add :
LoadModule jserv_module   /etc/httpd/modules/mod_jserv.so

Look for the AddModules statements, and add :
AddModule mod_jserv.c

Look for section where 'Include' statements can be put, and add:
Include /path/to/ApacheJServ-10/example/jserv.conf

10. Edit the jserv.conf file (found in /path/to/ApacheJServ/example directory)
Comment out the LoadModule line near the top

11. Edit the jserv.properties file
Uncomment the line that says : 
#security.selfservlet=true

12. Restart Apache
# apachestl restart

13. Surf to : http://localhost/jserv/ (Note the trailing slash -- it must be included !!)or http://localhost/example/Hello

14. That's it ! Hope it works for you !!

Regards,
Pascal Chong Yu Meng
Singapore