Sharable interface

The object system in a Java Card is partitioned into separate protected object spaces referred to as contexts. All applets in a given package share the same context, and are prohibited from accessing objects in a different context due to firewalls which are enforced by the Java Card Runtime Environment (JCRE) [ 8 ]. The JCRE is able to access objects in any context, and global arrays such as the APDU buffer (which are owned by the JCRE) can be accessed by applets in any context.

Prerequisites

Java Development Kit

Download and install JDK 7.

Java Card Development Kit

Download and install Java Card Development Kit 2.2.2.

GPShell

Download and install GPShell 1.4.4.

See also GPShell Wiki.

References

• Java Card Technology

• Developing a Java Card Applet

• Java Card Tutorial

• How to write a Java Card applet: A developer’s guide

• An Introduction to Java Card Technology - Part 1

• An Introduction to Java Card Technology - Part 2, The Java Card Applet

• An Introduction to Java Card Technology - Part 3, The Smart Card Host Application

• Development Kit User’s Guide, Java Card Platform, Version 2.2.2

• Application Programming Notes, Java Card Platform, Version 2.2.2

• Package com.sun.javacard.apduio

• Secure Object Sharing in Java Card

• CoolKey

• Global Platform for Java SmartCardIO

• Forum: Java Card

• OpenSC - tools and libraries for smart cards