Oracle Database 10g JRE Error I am trying to install Oracle Database 10.2 on OEL5U6(Linux System). I followed all the instructions from HERE.
When I am executing installer this return: 


  Preparing to launch Oracle Universal Installer from
  /tmp/OraInstall2013-08-06_12-57-33AM. Please wait ...The Java RunTime
  Environment was not found at
  /tmp/OraInstall2013-08-06_12-57-33AM/jre/bin/java. Hence, the Oracle
  Universal Installer cannot be run. Please visit
  http://www.javasoft.com and install JRE version 1.3.1 or higher and
  try again. : No such file or directory.


But Java is already installed on my system.
Please Do the below written instructions:


Set the class path of latest version of Java in your system  .
set the path as JAVA_HOME in Environment variable too.


Hope this would help you.