NetBeans 31 + Java 27 -> Bold Font

[PavelTurk]

I upgraded to Java 27, and now all the text in NetBeans 31 appears in bold.

For example:

I tried reducing the font size by adding --font-size 13 to the configuration file. The font size decreased, but the text still appears bold. I didn't have this issue with Java 25.

I use OpenJDK and Ubuntu 20.

Could anyone help me?

[neilcsmith-net]

You don't specify which Ubuntu, or whether it's the distro OpenJDK. If it's distro, it's usually a font configuration issue. You should be able to find some possible solutions online. Or try with an OpenJDK distribution like Temurin.

[PavelTurk]

Thank you for your reply. I wrote "I use OpenJDK and Ubuntu 20". Maybe you missed it. I will try to check font configuration - but I don't have such problem with other applications and with NetBeans 28 + Java 25

[PavelTurk]

NetBeans 31 + Java 25 -> everything works fine

[neilcsmith-net]

I wrote "I use OpenJDK and Ubuntu 20". Maybe you missed it.

I saw it! OpenJDK is not a single thing. Temurin is OpenJDK, Zulu is OpenJDK, distro install is (kind of) OpenJDK. Which?

Ubuntu 20 is not a release - I assume 20.04 given it was the LTS and not 20.10? Mind you, it's still out of support, so I'm curious where the Java 27 came from? There are 3 more Ubuntu LTS since then.

[PavelTurk]

I solved the problem. It seems to be a bug in OpenJDK 27.

The cause was duplicate fonts: both fonts-liberation and fonts-liberation2 were installed, and they contain files with identical names. On JDK 27, new Font("Liberation Sans", Font.PLAIN, 16) resolves to Liberation Sans Bold Italic, whereas JDK 21, 24, and 25 correctly return the regular face.

According to the font debug log, the JDK initially registers the Bold Italic file with a higher rank during font lookup. When the duplicate Regular file is subsequently encountered, it is rejected because it has a lower rank. As a result, the font family is left without a plain face, and the lookup falls back to Bold Italic.

Workaround - sudo apt remove fonts-liberation2

I will submit a bug report.