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Supported Java versions for Nuclos: Java 8 (minimum), Java 11 (recommended, LTS) and Java 17. OpenJDK-compatible, HiDPI and reflection notes. |
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Java versions
Which Java version for Nuclos? In short: Java 11 (LTS) recommended, Java 8 minimum, Java 17 supported.
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| title | Updated: Jul 2026 |
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| colour | Grey |
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| title | applies to Nuclos 4.2026.x |
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Recommendation at a glance
| Nuclos | Java | Status |
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| from 4.22 | Java 8 (min. 8u144) | Minimum |
| current | Java 11 (LTS) | Recommended |
| from 4.2023.31 | Java 17 (LTS) | Supported (Rich Client with caveats) |
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Nuclos is compatible with OpenJDK – no Java license costs. Use a 64-bit JDK. |
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Java 11 is an LTS release and currently the best choice for both server and Rich Client. |
Java 17
Java 17 is supported from Nuclos 4.2023.31. Server and Web Client run fully on Java 17; the Rich Client has two known caveats:
HiDPI (Rich Client on Windows)
With Windows scaling > 100 % the Rich Client UI may look blurry. Fix it via a VM option in the Launcher (Settings > Java configuration > JAVA_VMARGS):
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"-Dsun.java2d.uiScale.enabled=false" |
For very high-resolution 4K displays, use a fixed scale instead:
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"-Dsun.java2d.uiScale=2.0" |
Missing reflection arguments
If an extension/third-party library reports an InaccessibleObjectException, add the matching --add-opens argument – on the server via the installer (Additional JVM arguments), in the Rich Client via the Launcher (JAVA_VMARGS), e.g.:
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--add-opens=java.base/java.net=ALL-UNNAMED |
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Java 8 is still supported as a minimum but outdated. For new installs we recommend Java 11 or 17. |
Related pages
System requirements (DE)
All prerequisites at a glance.
Open →
Installation (DE)
Install Nuclos.
Open →
