Web Reference: Mar 18, 2024 · Learn ways to select the default Java installation version when several are available. Mar 25, 2026 · Ubuntu and Debian use the update-alternatives system to manage this, but there are actually four different ways to control which Java version runs, each useful in different scenarios. Jan 22, 2020 · It seems that only the OpenJDK 11 installation has a JDK (i.e. all the build tools including javac), whereas the Java 8 install is a pure JRE. Make sure that the -jdk package for both are installed and you'll be able to tweak javac using update-alternatives just as you did with java.
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