When running the IDE on some Linux distributions (such as Ubuntu 6 and 7 or Fedora Core) in some Asian locales, multi-byte characters may display as rectangles or otherwise incorrectly. This can happen when the JDK 5 or 6 font settings have not been customized for these or other Linux distributions.
These JDK pages tell which Linux distributions have asian font support:
Because there is no known workaround for this issue, it is recommended to use an alternative Linux distribution if you need to run under a locale subject to this behavior. Note that this problem does not occur on Red Hat Enterprise Linux 3 and 4.
Also, please ask the Linux distributor of the OS in which this problem might appear about correct JDK setting and any known workaround and also please consult with web pages, mailing list and forums of the Linux distribution to see if information on workarounds might be available.
See below for information on how to install Sun jdk on Ubuntu, which can help workaround the problem described here.
NOTE - Red Hat Enterprise 3 and 4 are supported by the JDK 1.5 and Java SE 6 as to font support for asian locales and this problem has not been seen when running NetBeans using those OS.
You can install sun-java5-jdk and sun-java6-jdk on Ubuntu and Debian.
Useful information for Japanese users can be found in Japanese NetBeans FAQ
Applies to: NetBeans 5.0, 5.5, 6.0, 6.1
Platforms: Linux