TestWBGC.java

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/*
 * @test TestWBGC
 * @bug 8055098
 * @summary Test verify that WB methods isObjectInOldGen and youngGC works correctly.
 * @library /testlibrary /testlibrary/whitebox
 * @build TestWBGC
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run driver TestWBGC
 */
import com.oracle.java.testlibrary.*;
import sun.hotspot.WhiteBox;

public class TestWBGC {

    public static void main(String args[]) throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
                true,
                "-Xbootclasspath/a:.",
                "-XX:+UnlockDiagnosticVMOptions",
                "-XX:+WhiteBoxAPI",
                "-XX:MaxTenuringThreshold=1",
                "-XX:+PrintGC",
                GCYoungTest.class.getName());

        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        System.out.println(output.getStdout());
        output.shouldHaveExitValue(0);
        output.shouldContain("WhiteBox Initiated Young GC");
        output.shouldNotContain("Full");
        // To be sure that we don't provoke Full GC additionaly to young
    }

    public static class GCYoungTest {
        static WhiteBox wb = WhiteBox.getWhiteBox();
        public static Object obj;

        public static void main(String args[]) {
            obj = new Object();
            Asserts.assertFalse(wb.isObjectInOldGen(obj));
            wb.youngGC();
            wb.youngGC();
            // 2 young GC is needed to promote object into OldGen
            Asserts.assertTrue(wb.isObjectInOldGen(obj));
        }
    }
}