Java25Base.java

import com.wannaverse.ignition.sdk.Ignition;
import com.wannaverse.ignition.sdk.SnapshotHandle;
import com.wannaverse.ignition.sdk.Vm;
import com.wannaverse.ignition.sdk.VmImage;
import com.wannaverse.ignition.sdk.VmSpec;

import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;

/** Run using: ignitionctl create Java25Base.java */
void main() throws Exception {
    Ignition ignition = Ignition.connect();
    Duration installBudget = Duration.ofMinutes(10);
    Vm builder = ignition.run("java25-builder", VmSpec.spec().vcpus(2).memoryMib(1024).diskSizeMb(3072));
    builder.execChecked(installBudget, "apt-get", "update");
    builder.aptInstall(installBudget, "openjdk-25-jdk-headless");
    String version = builder.exec("java", "--version").stdout().strip();
    builder.kill();
    builder.commit("java25-base");
    builder.remove();
}