International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 03 | Mar 2025
p-ISSN: 2395-0072
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Transforming Legacy Monolith Architecture: A Pragmatic Approach to Modulith Architecture Adoption Renjith Ramachandran1 1Independent Researcher and Solutions Architect, Hudson, MA, USA
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Abstract - Monolithic applications have been a part of
Companies take the path of software modernization to make the systems current from a technical stack perspective. Software modernization is the process of rearchitecting or replacing existing software systems with an architecture which is more flexible and cost effective [5]. Certain modernizations take years and it takes many more years to reap the benefits of the modernization initiative.
software development since its inception and gained prominence with the rise of web applications. As applications grew more complex, companies began adopting microservices architecture for greater agility, scalability, and faster release cycles. Over the last decade, microservices architecture saw widespread adoption. With the advent of containerization and orchestration tools like Kubernetes, many organizations transitioned from monolithic applications to microservices. However, some companies eventually found themselves dealing with an unmanageable number of microservices, prompting them to consider returning to monolithic systems or opting for a middle ground, known as Modulith architecture.
Monolithic applications have been a fundamental part of software development since its early days. With the widespread adoption of web applications, monolithic architectures gained significant popularity. They were typically built using technologies like JEE, .NET, or PHP. However, scaling and managing monolithic applications are challenging due to their large size and the single codebase shared among all developers [1]. Over the years lot of functionalities and unstructured code gets added to Monolith applications that they became resistant to modifications or costly to maintain because of licensing issues. As a result, many companies begin transitioning to more flexible architectures like Microservices Architecture (MSA).
Migrating a legacy application from an outdated architecture to a modern one requires a significant investment. Without proper planning and execution, such migrations can often result in failure. The purpose of the paper is to present a strategy for building an architecture and migration strategy for Modulith application, addressing key aspects such as unit and integration testing of modules, common logging patterns, exception handling, persistence isolation, domain modularization, inter-module communication, module security, deployment strategies, configuration management, DevOps, and code maintenance. The goal of the paper is to create a robust framework that is extensible, maintainable, detachable, and secure. This approach ensures the avoidance of the common pitfalls often associated with monolithic architectures.
The period from 2010 to 2020 witnessed a significant rise in the prevalence of Information Technology, with Digital and Digital Transformation emerging as hot topics by the middle of the decade. Digital transformation involves the integration of new Digital technologies like social, mobile, analytics and cloud [2][3]. One of the key advancements brought by Digital Transformation was the enhancement of scalability and agility in application delivery. With growth as a priority, businesses seek faster feature deployment and highly scalable applications.
Key Words: Modulith Architecture, Microservices Architecture, Monolithic Architecture, Modernization, Legacy Systems
Microservices Architecture (MSA) can effectively meet these requirements. A study by Taibi et al. highlights that key motivations for migrating to MSA include maintainability, scalability, delegation of team responsibilities, and DevOps support [6]. These factors, together, enhance the development process. Companies started developing microservices for specific functionalities, enabling different teams to work on services concurrently, thus accelerating time-to-market.
1.INTRODUCTION A legacy system is a software system that, over time, has become critical to business operations but has reached a point where maintenance is difficult, and it resists modifications [4]. Due to its original design, the system continues to operate and support business functions but lacks the flexibility to accommodate changes. Debugging issues can take hours, and upgrading the system would be highly costly.
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