Problems Installing Java

Hello, I've been trying for three days now to install java on a machine that supposedly didn't have any version. What I'm doing is to install jdk-7u55 via shell and displays the following error:

Preparing... ################################# [100%]

package jdk-2000:1.8.0_05-fcs.i586 (which is newer than jdk-2000:1.7.0_55-fcs.i586) is already installed

when i try to install jdk-8u5 the error now is

Preparing... ################################# [100%]

package jdk-2000:1.8.0_05-fcs.i586 is already installed

and "which java" returns

/usr/bin/which: no java in (/usr/lib/ccache:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/user20/.local/bin:/home/user20/bin)

and locate java returns a lot of info not any related to a java installation per se.

The thing is that jdk-7u55 must be installed because some development apps don't yet support the java update. I've tryd different versions of Oracle java with no success and cannot use openjdk(actually i haven't try this since is not an option)

Any pointers on what the cause could be?

The installation is on a Fedora 19 with latest updates

and the installation is with an rpm distribution

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