Java Magazine, Nov/Dec 2017
System Space Java Card RE Context System Firewall Applet Space Applet 1 Applet Firewall Applet Firewall Applet 3 Applet 4 Applet 5 Context B Context C Applet 2 Context A Figure 4 The security in multiapplet Java Card implementations ORACLE COM JAVAMAGAZINE NOVEMBER DECEMBER 2017 88 java card allows such sharing using the concept of shareable interface objects These objects provide the only way an applet can make its objects available for use by other applets For more information about using shareable interface objects see the description of the interface javacard framework Shareable The Client Server APDU Model The interface for communicating with a Java Card applet is a packet mechanism application protocol data units APDUs Related specifications are contained in the ISO 7816 Part 1 through Part 6 documents For the purpose of developing Java Card applets the most relevant document is ISO 00207816 4 application level Lower levels such as physical levels may vary for
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