Method for implementing dynamic update of Java program

Abstract

The invention relates to a method for realizing dynamic update of Java program in the computer technical field, which comprises the following steps: firstly, modifying the class definitions that need dynamic update in the passive dynamic update program, and adding update support method for realizing judgment to the subobjects of the class objects one by one, wherein the parameter is class loader; secondly, modifying the update class definitions in the dynamic update program, and adding update method for realizing initialization to the variables under the update class objects, wherein, the input parameter is class loader and old object; thirdly, modifying part of the method invocation, data field memory, and object set of the updated program with the Java reflection to realize running recovery of the program; finally, adding update support method to the main class and adding update checkpoint in the main method circulation. The invention has the advantages of avoiding software update that needs halt, update and reboot and avoiding loss caused by halt.

Description

technical field [0001] The present invention relates to a method in the field of computer technology, in particular to a method for realizing dynamic updating of Java programs. Background technique [0002] As computers are more and more widely used in society, various social activities of human beings are more and more dependent on them. Many software systems need to provide customers with uninterrupted services. An important topic, whether it can provide uninterrupted services has become an important indicator for people to measure software systems. For some companies, system outages are unacceptable or cause significant administrative overhead. Financial data processing systems will suffer huge economic losses due to service interruptions, and some systems that need to provide highly reliable services will suffer reputation and economic damage, such as telecommunication systems, online service systems, grid computing and service-oriented computing, etc. ; Another exampl...

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Problems solved by technology

[0004] After searching the literature of the prior art, it was found that Malabarba S et al published "Runtime support for type-safe dynamic Java classes" on pages 337 to 361 of "Proceedings of the European Conference on Object-Oriented Programming" in 2000, which proposed In order to ensure that the program is still safe after dynamic type replacement, if you only use the type loading that comes with java, it is easy to cause two problems: 1) the original program contains the use of methods and data that do not exist in the new class; 2) Since the inheritance relationship of the new class may change, this will inevitably affect some programs and types that use the parent class of this class, and such errors are not easy to find

In this article, the dynamic update method by extending the Java class loading mechanism is short of it. The article only points out that it can be realized by extending the class loading mechanism, but it does not put forward how to realize the conversion of old and new class objects in the update, and how to transform the program. the solution