Java in Gentoo

Libraries (JAR) locations

• Java packages are VERY often SLOTed.

• If a package is SLOTed, the jar go to /usr/share/package-name-SLOT/package-name.jar. Note that in the JAR there should not be any version number. Beware that some old/badly written ebuilds can forget to specify a SLOT, thus, the jar end in /usr/share/package-name/package-name.jar. This can be confusing when using java-config -p which report the location of the JAR (since it may mask the fact that another version of the package exist).

Classpath

• The java command on Gentoo honors the CLASSPATH variable. So often the best way to specify the classpath is via this variable.