TestPrintReferences.java

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/*
 * @test TestPrintReferences
 * @bug 8136991
 * @summary Validate the reference processing logging
 * @key gc
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 */

import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

public class TestPrintReferences {
  public static void main(String[] args) throws Exception {
    ProcessBuilder pb_enabled =
      ProcessTools.createJavaProcessBuilder("-Xlog:gc+ref=debug", "-Xmx10M", GCTest.class.getName());
    OutputAnalyzer output = new OutputAnalyzer(pb_enabled.start());

    String countRegex = "[0-9]+ refs";
    String timeRegex = "[0-9]+[.,][0-9]+ms";

    output.shouldMatch(".* GC\\([0-9]+\\) SoftReference " + timeRegex + "\n" +
                       ".* GC\\([0-9]+\\) WeakReference " + timeRegex + "\n" +
                       ".* GC\\([0-9]+\\) FinalReference " + timeRegex + "\n" +
                       ".* GC\\([0-9]+\\) PhantomReference " + timeRegex + "\n" +
                       ".* GC\\([0-9]+\\) JNI Weak Reference " + timeRegex + "\n" +
                       ".* GC\\([0-9]+\\) Ref Counts: Soft: [0-9]+ Weak: [0-9]+ Final: [0-9]+ Phantom: [0-9]+\n");

    output.shouldHaveExitValue(0);
  }

  static class GCTest {
    public static void main(String [] args) {
      System.gc();
    }
  }
}