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Top 11 Java Mocking Projects
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Project mention: Stepping down as Mockito maintainer after 10 years | news.ycombinator.com | 2025-12-28
> Is there a point at which library maintainer feedback would meaningfully influence a by-default JVM change?
Of course, just keep in mind that all these changes were and are being done in response to feedback from others. When you have such a large ecosystem, users can have contradictory demands and sometimes it's impossible to satisfy everyone simultaneously. In those cases, we try to choose whatever we think will do the most good and the least harm over the entire ecosystem.
> JPMS is a good example: --add-opens still remains valuable today for important infra like Hadoop, Spark, and Netty. If other, even more core projects (e.g. Arrow) hadn't modernized, the exceptions would be even more prolific.
I think you have answered yourself. Make sure the libraries you rely on are well maintained, and if not - support them financially. BTW, I think that Netty is also abandoning its hacking of internals.
> If libraries so heavily depended upon like Mockito are unable to offer a viable alternative in response to JEP 451
But they have, and we advised them on how: https://github.com/mockito/mockito/issues/3037
The main "ergonomic" issue was lack of help from build tools like Gradle/Maven.
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公式サイト / GitHub：https://wiremock.org
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PowerMock
PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.
There's no easy way to test the start() method. In the old days, Mockito developers had pushed back against this feature, and the only alternative was PowerMock. The decision was reversed in 2020 with the 3.4.0 release, which introduced static method mocking in Mockito.
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microcks
The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀
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mockito-object-injection
Mockito Object Injection for JUnit5. Inject Strings and other Objects directly into Mocks without needing setters or constructor injection.
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
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A note from our sponsor - SaaSHub
www.saashub.com | 16 Jun 2026
Index
What are some of the best open-source Mocking projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Mockito | 15,431 |
| 2 | WireMock | 7,275 |
| 3 | PowerMock | 4,184 |
| 4 | microcks | 1,960 |
| 5 | Mockneat | 536 |
| 6 | JMockit | 471 |
| 7 | unlogged-sdk | 192 |
| 8 | Hoverfly Java | 175 |
| 9 | grpcmock | 158 |
| 10 | juneau | 94 |
| 11 | mockito-object-injection | 8 |
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