$OA_HTML/bin/appsweb and $FND_TOP/resource show the Sun Plugin Entries:

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; Following are the accepted values:

; jinit - use the JInitiator plugin (default)

; jdk - use the Sun's JDK plugin

plugin=jdk

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; 4a) Sun JDK Plugin Parameters

; ---------------------------------------------

; These parameters define the Sun's java plug-in to be used

sun_plugin_mimetype=application/x-java-applet;jpi-version=1.5.0_09

sun_plugin_classid=clsid:CAFEEFAC-0014-0002-0004-ABCDEFFEDCBA

sun_plugin_url=http://<instance_fqdn_name>:8000/OA_HTML/oajinit.exe

sun_plugin_version=1.5.0_09

sun_plugin_legacy_lifecycle=false

;

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