Oracle America, Inc.

Oracle International Corporation

Sun Microsystems, Inc.

Saqib J Ahmad

Thierry Violleau

Tanjore S Ravishankar

Sebastian J Hans

Matthew R Hill

A method for preserving backward compatibility involves adding a new virtual method to a first version of a code package comprising a plurality of members to obtain a second version of the code package, wherein the plurality of members include a plurality of virtual methods having at least a first virtual method that is assigned a first token number and a second virtual method that is assigned a second token number sequentially after the first token number, converting a set of code that is part of the first version of the code package to obtain a converted file, modifying the converted file to include backward compatibility information associated with a plurality of token numbers assigned to the plurality of virtual methods in the first version of the code package, and adjusting the assigned first and second token numbers at one of linking time and runtime based on the backward compatibility information.

Preservation of backward compatibility for java card cap files

One particular implementation may take the form of a system or method for tracking application identification and application context in a context-isolated computing environment. The method may store such application information to reduce redundant information being stored on a stack. More particularly, the embodiment may store the application information in a context-specific marker frame. The context-specific marker frame may be stored once on the stack or it may be stored separately from the stack to maintain a small stack size. In another implementation, an invocation handler method may be called to store the redundant information about the executing application. The invocation handler may store the necessary information in a well-known location for later use by the virtual machine. The invocation handler may also provide further benefits, such as synchronization to ensure thread safety on shareable objects.

Method to track application context and application identification

A system and method for object deletion in persistent memory using bitmap windows representing memory chunks. In accordance with an embodiment, the system can generally be used with computing environments that use persistent memory, such as smart cards, Java Cards, and other resource-constrained environments. In accordance with an embodiment, the system comprises a processor or computational engine and a persistent memory for storage of software objects; and a data structure which can include one or more memory bitmap windows, each of which represents a chunk of addressable space in the persistent memory; wherein the system uses the one or more memory bitmap windows in deleting non-reachable objects from the persistent memory.

System and method for object deletion in persistent memory using bitmap windows

One embodiment of the present invention provides a system that facilitates modifying a platform-independent programming language build tool to aid in the development and testing of smart card applications. The system operates by creating a task in the platform-independent programming language build tool that allows a user to perform functions associated with the development and testing of smart card applications. Next, the system extends the platform-independent programming language build tool interface to include the task so that the task is executable by the user. Note that making the task part of the platform-independent programming language build tool interface reduces the overhead involved in performing functions associated with developing and testing smart card applications.

Method and apparatus for modifying a platform-independent programming language build tool

To execute legacy smart card applications in a next generation smart card environment, a mechanism converts the applications into a format executable by the next generation smart card platforms. For instance, in a Java-based environment, a normalizer tool translates a CAP file into a Java Class file. Additional mechanisms recreate, on next generation smart cards, a specialized environment that allows the legacy applications to execute without impacting legacy and non-legacy application performance. For example, mechanisms create new instances of previously shared objects so that legacy applications can continue to expect exclusive access to those objects. Moreover, mechanisms manage the communication between a legacy application and non-legacy applications by controlling how and when calls are sent to the legacy application.

Supporting applets on a high end platform

One embodiment of the present invention provides a system for deleting objects from a memory in a computing device, wherein the memory includes both a volatile memory and a non-volatile memory that is writeable. During operation, the system receives a request to perform an object deletion operation, which locates and deletes unused objects from the memory. In response to this request, the system performs the object deletion operation by first performing a marking operation that marks objects that are reachable in the non-volatile memory. This marking operation does not directly mark the objects in the non-volatile memory, but instead marks data values in the volatile memory that are associated with the objects. In this way, unnecessary write operations to non-volatile memory are avoided. Next, the system performs a sweep operation that deletes unmarked objects from the non-volatile memory.

Growing community of inventors

Santa Clara, CA, United States of America

Saqib J Ahmad