JavaGCTest.java

package org.testcontainers;

import org.assertj.core.api.Assertions;
import org.junit.Test;
import org.testcontainers.containers.GenericContainer;
import org.testcontainers.containers.startupcheck.OneShotStartupCheckStrategy;

public class JavaGCTest {

    @Test
    public void shouldUseG1GC() {
        try (GenericContainer<?> java = new GenericContainer<>("eclipse-temurin:17-jdk-focal")
            .withStartupCheckStrategy(new OneShotStartupCheckStrategy())
            .withCommand("java", "-XX:+PrintFlagsFinal", "-version")
            .withCreateContainerCmdModifier(cmd -> cmd.getHostConfig().withMemory(1024L * 1024L * 2000))) {
            java.start();

            String logs = java.getLogs();
            Assertions.assertThat(logs).containsPattern(".*G1GC.*true.*");
        }


    }

    @Test
    public void shouldUseSerialGc() {
        try (GenericContainer<?> java = new GenericContainer<>("eclipse-temurin:17-jdk-focal")
            .withStartupCheckStrategy(new OneShotStartupCheckStrategy())
            .withCommand("java", "-XX:+PrintFlagsFinal", "-version")
            .withCreateContainerCmdModifier(cmd -> cmd.getHostConfig().withMemory(1024L * 1024L * 1000))) {
            java.start();

            String logs = java.getLogs();
            Assertions.assertThat(logs).containsPattern(".*SerialGC.*true.*");
        }

    }

}