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When to Use Microservices in Java

Microservices are gaining traction for developers, and many that haven’t already implemented this architecture are considering doing so. But how do you know when to use microservices and when it’s not the right choice for you?

Keep reading and discover pros and cons, as well as when and when not to use a microservices architecture in your Java application.

Microservices Benefits

Microservices have a number of benefits that make them an appealing option for Java developers. From their independent organization, the flexibility and security they can offer, many developers bank on the benefits of microservices when developing.

Microservices Are Independent

Since features are split up into siloed services, they can then be designed, tested, and deployed independently, rather than having to redeploy an entire application to update just one feature. And, because the separate services are independently developed and deployed in parallel, they require less coordination, allowing your team to move faster and be more agile, releasing more frequent software updates.

Microservices Are Flexible

The isolation of microservices knocks down the rigid constraints of legacy, monolithic applications. Whereas a monolith demands that all developers use the same technology, with microservices, teams working on different services aren’t all locked into one tech stack. Teams assigned to individual services have the freedom to use the language, platform, and tools of their preference.

Microservices Can Be More Secure

The segmented nature of microservices make them easier to update and patch, and as a result, they maintain less legacy code than monolithic applications from one version to the next. Therefore, they’re far less susceptible to security failures. The smaller attack surface means the team assigned to each service can better determine where security patches are needed and dedicate their efforts to protecting that single feature.

Disadvantages of Microservices

While microservices provide numerous benefits for development teams, this architecture style comes with some disadvantages to keep in mind as well.

Microservices Affect Development Culture

Because of the shift in your team structure and dynamics, people will need to be re-organized and distributed across all the services you are working with. This won’t only create significant time and effort to determine who should be where, but it may also cause friction if certain people are unhappy with the change.

That’s not to mention the necessity for executive buy-in. Getting leadership to understand the changes and potential pain points, as we outline here, can substantially increase the odds of success.

Microservices Add Complexity

Because you can use any technology within microservices, it may result in increased troubleshooting challenges. Tracing errors (or just odd behavior) from one microservice to another is far more difficult than doing the same thing in a single traditional application. That’s especially true when each service uses a different language, platform, monitoring tool, logging framework, and the like.

It can also be harder to resolve performance issues, especially when it comes to increasing latency in a large graph of microservices.  Finally, developers have to deal with eventual consistency and compensating operations instead of the “simple” ACID transactions the industry has known for decades.

Microservices Need DevOps

Lastly, teams that use microservices need to work with highly-automated environments, as some organizations will deal with handfuls, dozens, or even hundreds of moving parts – an impossible task to handle manually. This will require the adoption and use of DevOps tools like CI/CD and distributed logging, tracing, monitoring, and visualization facilities.

Microservices Pros and Cons

 In sum, the pros and cons of microservices are as follows:

Focuses on single business capabilityDifficult to coordinate teams
Freedom to use different technologiesCreates troubleshooting challenges
Supports individual deployable unitsIncreases configuration/operation efforts
Small attack surfaceHard to track data across services

When and When Not to Use Microservices

 So, when are microservices a good idea, and when should they be avoided? Consider the pros and cons detailed in this article. Do the benefits address your specific business needs, and does your team have the manpower and capabilities to overcome the challenges?

Additionally, assess whether you have components that:

  • Have good test coverage and little technical debt
  • Are best suited for the cloud due to scalability requirements
  • Change and deploy regularly
  • Cause frequent frustration in the business

These all provide good cases for using a microservices architecture. However, you may not want to make the move if you are operating with a small team. Depending on project size, each service may require its own team to develop and manage and a couple of people may need to stay working on the legacy app.

Also consider your timeframe: if you need fast results and your team has no experience with microservices, your project is far more likely to fail than succeed.  Choose microservices for long term results and expect some bumps along the way.

Additional Resources

Ready to make the leap into microservices? Learn more about how they differ from monolithic applications, as well as options for making the transition in our recent webinar series from Perforce CTO Rod Cope:

Microservices vs. Miniservices vs. Monolith: Winner Takes All?

Making the Move to Microservices for Java Applications

If you choose to move forward with microservices, you can also learn more about deploying microservices in this blog post:

Deploying Microservices in Java

Improve Your Microservices Development Efficiency

You’ll also need tools that increase developer efficiency, reduce downtime and increase code visibility as you deploy microservices. Together, JRebel and XRebel can help developers do just this.

Want to see JRebel and XRebel in action? Join us for an upcoming 20 minute demo.


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