Java is a programming language and computing platform first released by Sun Microsystems in 1995. There are lots of applications and websites that will not work unless you have Java installed, and more are created every day.
IIS is able to impersonate the IUSR_<computername> account because the user name and password for this account are known by IIS. Before returning a page to the client, IIS checks NTFS file and directory permissions to see if the IUSR_<computername> account is allowed access to the file.
You can set modify permissions on companydata* for the IUSR account and you can add this user to the IIS_IUSRS group and use that useraccount to run your application pool under. You only need to grand permissions for IIS_IUSRS on shared folders (TMP for instance), if you have multiple IUSR_accounts.