java-maven.md

Java and Maven

JDKs and Maven are managed with SDKMAN in the user's home directory. Fedora's own headless OpenJDK stays installed and separate for system use.

Versions

Tool	Version	Notes
SDKMAN	5.23.0	~/.sdkman
Java (default)	25.0.4-tem	Eclipse Temurin 25 (LTS)
Java (alternate)	21.0.12+1.1-tem	Eclipse Temurin 21 (LTS)
Maven	3.9.16	via SDKMAN
System JDK	Fedora java-*-openjdk-headless	untouched, for OS packages

Setup

curl -s "https://get.sdkman.io" | bash
# integrations.zsh already sources sdkman-init.sh

sdk install java 25.0.4-tem
sdk install java 21.0.12+1.1-tem
sdk default java 25.0.4-tem
sdk install maven 3.9.16

~/.config/zsh/integrations.zsh ends with:

export SDKMAN_DIR="$HOME/.sdkman"
[[ -s "$SDKMAN_DIR/bin/sdkman-init.sh" ]] && source "$SDKMAN_DIR/bin/sdkman-init.sh"

Switching Java per project

Java 25 is the default. Select 21 for LTS-bound projects:

sdk use java 21.0.12+1.1-tem      # current shell only
sdk env install                   # write .sdkmanrc from current versions
sdk env                           # apply .sdkmanrc in this directory

Commit a .sdkmanrc in projects that need a specific JDK. JAVA_HOME is managed by SDKMAN's shims; do not hard-code it in the shell profile.

Verify

sdk current
java -version                     # Temurin 25.0.4
mvn -version                      # Maven 3.9.16, runtime = SDKMAN Temurin
which java                        # ~/.sdkman/candidates/java/current/bin/java