We are working on a tool that would allow for detecting duplicate object allocations in Java runtime. We aim to enable programmers to see which parts of their code are responsible for the duplicate object allocations or modifications. As we would like not to be limited only to the immutable objects, our current approach is limited to creating the new object and modifying their attributes using the standard setters defined for Java beans. The developed tool aims to improve program performance by identifying problematic places in the program code.