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Speed up maven build times.
# rip off from https://zeroturnaround.com/rebellabs/your-maven-build-is-slow-speed-it-up/
# in .bashrc
set MAVEN_OPTS="-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
# add -DdependencyLocationsEnabled=false to retain fewer outgoing connections.
# compile all modules
mvn -T 1C install -offline
# compile specific module
mvn -T 1C install -pl $moduleName -am -offline
# -T 1C: one thread per cpu core.
# -offline: offline mode, does not checks for newer snapshots.
# -pl $moduleName: build only specified module.
# -am: build depended modules (use with -pl).
# PS: mvn clean is not used, helps speedup as it's an incremental build.
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