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In Java computing context, ADAJ (Adaptive Distributed Application in Java) provides a both execution and programming system for irregular distributed applications. From the execution point of view, load balancing is an important issue and requires special information policies. Traditionnally only the computer load is taken into account.Consequently, the load balancing is made by being unaware of the relations between objects. The objects are moved of a computer on the other without knowing the consequences in term of communication. To avoid that problem we introduce in that paper two mechanims: a relation observation mechanism of distributed objects and a computer load observation. The dynamical observation information provided by these mechanisms will be able to allow a general load balancing mechanism to have an intelligent adaptative object redistribution strategy. The proposed observation tools are entirely designed in Java. Some experiment results which concerns relation observations and overhead measurements are presented.

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This paper presents a detailed study of the mechanism to design a compiler of Smali language to generate optimized Android applications. Smali language; which includes the dex bytecode; is the assembly language under Android OS, it is generated from the Java source code. The phases of designing the target compiler are described and the structure of files that are the input and output of the compiler are explained.