Java 9 was one of the most important updates in the Java ecosystem, mainly because it introduced the Module System (Project Jigsaw). However, when it was released, many developers became confused due to rumors and misunderstandings about its compatibility and usage.
Oracle’s Java Platform Chief Architect Mark Reinhold clarified several of these misconceptions and helped developers understand what Java 9 actually means for real-world development.
Let’s clear up the most common myths one by one.
1. “Maven will not work with Java 9” – ❌ False
One of the biggest rumors was that build tools like Maven would stop working after Java 9.
✔ Reality:
Maven works perfectly fine with Java 9.
There were only minor issues in some plugins (like test-related plugins), which were quickly fixed by the community.
👉 Conclusion: You can safely use Maven and other build tools with Java 9.
2. “Libraries and frameworks will break” – ❌ Misleading
Many developers feared that popular frameworks such as Spring Boot and Hibernate would stop working.
✔ Reality:
Some libraries initially had compatibility issues, but this is normal with any major version update. Developers of these frameworks had early access to Java 9 and started updating their tools before the official release.
👉 Conclusion: Most modern frameworks are already compatible or quickly updated.
3. “You must convert everything to modules” – ❌ Not true
Java 9 introduced a new feature called the Module System, which caused confusion among developers.
✔ Reality:
You are NOT required to convert your entire project into modules.
Java still supports the traditional class path system, and developers can continue using it as before.
👉 Conclusion: Modules are optional, not mandatory.
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