R12.1.3 : Patch 15843459:R12.PRC_PF.B - Causes ERROR [code=11] compiling out of date JSP files

Hi,
when loading the below patch we get the following error

perl -x .../apps/tst/apps/apps_st/appl/fnd/12.0.0/patch/115/bin/ojspCompile.pl --compile --quiet

AutoPatch warning:
ERROR [code=11] compiling out of date JSP files

An error occurred while compiling JSP files.
Continue as if it were successful [No] :


Error in ojspc_error.log
error! could not invoke exec java oracle.jsp.tools.Jspc -forgiveDupDirAttr -extraImports java.util.*,java.io.*,java.lang.reflect.*,java.beans.* -version:
(256)


the log file is showing :

ojspc_error.log
----------------------
(dir) /..../apps/tst/apps/apps_st/comn/java/classes
       (file) /..../apps/tst/apps/tech_st/10.1.2/jlib/ewt3.jar