Java Error : My software is not getting installed requires java

Once when we install some softwares on the system , it will raise an issue called as "main.class required or java is required to run the software". 

Please do not install jdk1.4 etc and make the process complicated.
Go to Sun Microsystems and download jre (java runtime environment) and install on the system.
 Your problem would be solved.

http://javadl.sun.com/webapps/download/AutoDL?BundleId=31620

Thank you