HowtoLinux

Download the bin file from the java website:
http://java.sun.com/products/archive/
Install the package as root:
su – root
Change the execute rights:
chmod 700 jdk_*.bin
Execute the bin:
./jdk_*.bin
Java will be installed in /usr/java/
export JAVA_HOME=/usr/java/jdk…
export PATH=$JAVA_HOME/bin:$PATH
Now you can check if everthing is ok by:
which java
java -version
In debian server you can do it in one command and no manal downloading.
with just one command, no [...]

Ref:http://community.polarion.org/help/index.jsp?topic=/com.polarion.xray.doc.user/install_linux.html
This section covers installation and startup procedures for Linux. There is also some information about initial configuration of Polarion on Linux, as well as reference information about the Polarion installation structure and third-party components.
 
 
Update vs. New Installation
The current version 2.6.5 can be used for a fresh installation or as an update for version 2.6.0. [...]

referance:  http://www.meritonlinesystems.com/docs/apache_tomcat_redhat.html
1.0 Introduction
Java servlets are a powerful tool for building websites and web based applications. One skill that every Java web developer should have is the ability to install and configure the Tomcat servlet engine. Many thanks to the Apache Software Foundation for providing this mature, stable, open source software. It was recently voted the [...]