test/runtime/NMT/JcmdWithNMTDisabled.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @key nmt jcmd
 * @summary Verify that jcmd correctly reports that NMT is not enabled
 * @library /testlibrary
 * First run without enabling NMT
 * @run main/othervm JcmdWithNMTDisabled
 * Then run with explicitly disabling NMT, should not be any difference
 * @run main/othervm -XX:NativeMemoryTracking=off JcmdWithNMTDisabled
 */

import com.oracle.java.testlibrary.*;

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

  public static void main(String args[]) throws Exception {
    // 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");
  }
}