4.0.0 com.ankurm java-core-examples 1.0 synchronizers synchronizers CountDownLatch vs CyclicBarrier vs Phaser vs Semaphore: one three-round worker pipeline implemented four ways, reuse semantics, timeout behavior, and virtual-thread compatibility. org.junit.jupiter junit-jupiter 5.11.0 test org.apache.maven.plugins maven-compiler-plugin 3.13.0 25 org.apache.maven.plugins maven-surefire-plugin 3.2.5