Unable to launch discoverer because of Missing Required Permissions Manifest Attribute In Main Jar & Security Exception, JVM Shared, not allowed to set security manager

After client java upgrade for EBS R12 from jre 1.6.0_33 to 1.7.0_51 we have been warned , clients getting below error whenever invoking discoverer.

Missing Required Permissions Manifest Attribute In Main Jar :

For this error we have applied 17347648 ,17303613 and 17874742 sequentially. At last below error occured ,

Security Exception, JVM Shared, not allowed to set security manager

More inclusive patch 18219024 adviced from support.But not able to patch because of this error,

Running prerequisite checks... 

Prerequisite check "CheckPatchApplicableOnCurrentPlatform" failed. 

The details are: 

Patch ( 18219024 ) is not applicable on current platform. 

Platform ID needed is : 226 

Platform IDs supported by patch are: 46 

[ Error during Prerequisite for apply Phase]. Detail: OPatch failed during prerequisite checks: Prerequisite check "CheckPatchApplicableOnCurrentPlatform" failed. 

System is intact, OPatch will not restore the system 

Despite Oracle published patch is generic platform , i could not apply patch to linux platform. Oracle support has a solution which is  changing  <platform name="" > entry to proper value in  PATCH_LOCATION/etc/config/inventory.xml file.

I have changed 
 <platform name="Linux Intel" id="46"/>
to
 <platform name="Linux Intel" id="226"/>

With this solution patch has been applied successfully and discover problem has gone.