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Finally, we describe an empirical study that we performed to validate the technique of a real Java subject.

The host system can quickly verify the validity of the proof, and it can compare the conclusions of the proof to its own security policy to determine whether the application is safe to execute.Our experience with Javelus indicates that low-disruptive and type-safe dynamic updating of Java applications can be practically achieved with a lazy updating approach.During maintenance, systems are updated to correct faults, improve functionality, and adapt the software to changes in its execution environment.In this paper we present Javelus, a Java Hot Spot VM-based Java DSU system with very short pausing time.Instead of updating everything at once when the running application is suspended, Javelus only updates the changed code during the suspension, and migrates stale objects on-demand after the application is resumed.We then investigate the effects of dynamic updating by performing a dynamic updating experiment on five consecutive revisions of the classical arcade game Breakout using the dynamic updating system Gosh! Based on the result of this experiment we show that dynamic updating of class definitions for live objects may under some circumstances result in different run-time behavior than would be observed after a cold restart of the upgraded application.Finally, we conclude by discussing the implication of integrating the dynamic updating model of Gosh! The successful integration of these two systems will set a new standard for dynamic software updating in Java.With a careful design this lazy approach neither sacrifices the update flexibility nor introduces unnecessary object validity checks or access indirections.Evaluation experiments show that Javelus can reduce the updating pausing time by one to two orders of magnitude without introducing observable overheads before and after the dynamic updating.add or move), or a jump operation (deciding which instruction executes next, often conditional on the results of a previous instruction).Every executable program is made up of a series of these atomic instructions.