TestDisableDefaultGC.java

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package gc.arguments;

/*
 * @test TestDisableDefaultGC
 * @summary Test that the VM complains when the default GC is disabled and no other GC is specified
 * @bug 8068579
 * @library /test/lib
 * @library /
 * @requires vm.gc=="null"
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run driver gc.arguments.TestDisableDefaultGC
 */

import jdk.test.lib.process.OutputAnalyzer;

public class TestDisableDefaultGC {
    public static void main(String[] args) throws Exception {
        // Start VM, disabling all possible default GCs
        ProcessBuilder pb = GCArguments.createJavaProcessBuilder("-XX:-UseSerialGC",
                                                                 "-XX:-UseParallelGC",
                                                                 "-XX:-UseG1GC",
                                                                 "-XX:-UseZGC",
                                                                 "-XX:+UnlockExperimentalVMOptions",
                                                                 "-XX:-UseShenandoahGC",
                                                                 "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldMatch("Garbage collector not selected");
        output.shouldHaveExitValue(1);
    }
}