test/runtime/NMT/JcmdWithNMTDisabled.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @key nmt jcmd
 * @summary Verify that jcmd correctly reports that NMT is not enabled
 * @library /testlibrary
 * @run main JcmdWithNMTDisabled 1
 */

import com.oracle.java.testlibrary.*;

public class JcmdWithNMTDisabled {
  static ProcessBuilder pb = new ProcessBuilder();
  static String pid;

  public static void main(String args[]) throws Exception {

    // This test explicitly needs to be run with the exact command lines below, not passing on
    // arguments from the parent VM is a conscious choice to avoid NMT being turned on.
    if (args.length > 0) {
      ProcessBuilder pb;
      OutputAnalyzer output;
      String testjdkPath = System.getProperty("test.jdk");

      // First run without enabling NMT
      pb = ProcessTools.createJavaProcessBuilder("-Dtest.jdk=" + testjdkPath, "JcmdWithNMTDisabled");
      output = new OutputAnalyzer(pb.start());
      output.shouldHaveExitValue(0);

      // Then run with explicitly disabling NMT, should not be any difference
      pb = ProcessTools.createJavaProcessBuilder("-Dtest.jdk=" + testjdkPath, "-XX:NativeMemoryTracking=off", "JcmdWithNMTDisabled");
      output = new OutputAnalyzer(pb.start());
      output.shouldHaveExitValue(0);

      return;
    }

    // Grab my own PID
    pid = Integer.toString(ProcessTools.getProcessId());

    jcmdCommand("summary");
    jcmdCommand("detail");
    jcmdCommand("baseline");
    jcmdCommand("summary.diff");
    jcmdCommand("detail.diff");
    jcmdCommand("scale=GB");
    jcmdCommand("shutdown");
  }

  // Helper method for invoking different jcmd calls, all should fail with the same message saying NMT is not enabled
  public static void jcmdCommand(String command) throws Exception {

    pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", command});
    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    // Verify that jcmd reports that NMT is not enabled
    output.shouldContain("Native memory tracking is not enabled");
  }
}