Conservative class preloading for real time java execution

A computer hardware system, comprising:

• a hardware processor;
• and
• a computer hardware memory having stored therein instructions executable by the hardware processor, the instructions including:
• receiving, from an application, a jar file having a class file including a list of methods and classes, the list of methods and classes including a method list and a class list;
• performing first loop operations of a first loop until no new methods and classes are found, the first loop operations including:
• scanning each method within the method list, and
• adding new method(s) and/or class(es) to the list of methods and classes;
• performing second loop operations of a second loop until no new static method byte codes are identified, the second loop operations including:
• adding identified new static method byte codes to the list of methods and classes,
• executing the first loop, and
• identifying any virtual method(s) and/or interface(s) accessed by the application;
• performing third loop operations of a third loop until no new virtual method(s) and/or interface(s) are identified, the third loop operations including:
• adding, for each of the new identified virtual method(s), all dispatch targets to the method list, and
• executing the second loop;
• recording, as a conservative class list, the class list as modified by the first, second, and third loop operations;
• and
• forwarding, to the application, the conservative class list.

A computer program product, comprising,

• a hardware storage device having stored therein computer instructions
• the computer instructions, when executed by a computer hardware system, causes the computer hardware system to perform:
• receiving, from an application, a jar file having a class file including a list of methods and classes, the list of methods and classes including a method list and a class list;
• performing first loop operations of a first loop until no new methods and classes are found, the first loop operations including:
• scanning each method within the method list, and
• adding new method(s) and/or class(es) to the list of methods and classes;
• performing second loop operations of a second loop until no new static method byte codes are identified, the second loop operations including:
• adding identified new static method byte codes to the list of methods and classes,
• executing the first loop, and
• identifying any virtual method(s) and/or interface(s) accessed by the application;
• performing third loop operations of a third loop until no new virtual method(s) and/or interface(s) are identified, the third loop operations including:
• adding, for each of the new identified virtual method(s), all dispatch targets to the method list, and
• executing the second loop;
• recording, as a conservative class list, the class list as modified by the first, second, and third loop operations;
• and
• forwarding, to the application, the conservative class list.