Important differences and changes points in R12.1 and R12.2.
1. In R12.1, Oracle E-Business Suite is deployed on iAS 10.1.3 Oracle Containers for J2EE (OC4J).
But
In R12.2 Oracle E-Business Suite is deployed on FMW 11g 11.1.1.6 (PS5), WebLogic Server 11g 10.3.6 (PS5).
2. In R12.1, EBS JDK 6.0_10 Oracle JRockit support Not Applicable to Oracle E-Business Suite 12.1 technology stack.
But
In R12.2 JRockit 1.6.0_22, JDK 1.6.0_21, Oracle JRockit JVM certified and recommended on Linuxand Windows. Target JDK 1.7.
3. In R12.1 Oracle Database Enterprise Edition from 10g to 11gR2.
But
In R12.2 Oracle Database Enterprise Edition, 11g 11.2.0.3 with edition based redefinition.
4. In R12.1 Oracle JSP Compiler 10.1.3 is used.
But
In R12.2 WebLogic JSP Compiler 11g 10.3.6 is use.
5. In R12.1 Apache 1.3.34 is used.
But
In R12.2 the new Apache 2.2 is using.
6. In R12.1 Java Object Cache 10.1.3 is used.
But
In R12.2 FMW 11g 11.1.1.6 is used.
7. In R12.1, Oracle JDBC Thin Drivers 11gR2 repackaged and delivered via Oracle E-Business Suite. $OAD_TOP/*jdbc*.zip
But
In R12.2 Oracle JDBC Thin Drivers 11gR2 used directly from Fusion Middleware installation. 11g iAS Ojdbc6dms.jar
8. In R12.1 Oracle SSL Libraries is used.
But
In R12.2 Java Secure Socket Extension (JSSE) is used.
*: In both R12.1 and R12.2 common is Forms / Reports iAS 10.1.2 is used.