upgrading oracle application server

[Ahmed M. Omar]

i am using oracle application server 1.3

when i useing

 
response.setCharacterEncoding("windows-1256");
   

it does not work , after search i find that this version of application server supports servlet 2.2 and this method requires 2.3

question : there is any way to upgrade the application server or to replace this method with one complains to 2.2 ?

hint : when i run this servlet to tomcat 6.0.20 it runs perfectly
regards