问没有为Util类型定义方法。

EN

The method longStackTrace(Throwable, boolean) is undefined for the type Utils   

The method shortStackTrace(Throwable, boolean) is undefined for the type Utils

<testng.version>6.10</testng.version>
 <dependency>
             <groupId>org.testng</groupId>
             <artifactId>testng</artifactId>
             <version>${testng.version}</version>
             <scope>test</scope>
             <scope>compile</scope> //tried this also
  </dependency>

package firsttestngpackage;

import java.util.Map;

//import org.apache.xml.serializer.utils.Utils;

import org.testng.IReporter;
import org.testng.ISuite;
import org.testng.ISuiteResult;
import org.testng.reporters.TestHTMLReporter;
import org.testng.xml.XmlSuite;

import org.testng.ITestContext;
import org.testng.ITestNGMethod;
import org.testng.ITestResult;
import org.testng.Reporter;
import org.testng.TestListenerAdapter;
import org.testng.TestRunner;
import org.testng.internal.Utils;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.Serializable;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.Objects;



public class CustomReport  implements IReporter {

     @Override
        public void generateReport(List<XmlSuite> xmlSuites, List<ISuite> suites,
                                   String outputDirectory) {

        }

     public static void generateTable(PrintWriter pw, String title,
              Collection<ITestResult> tests, String cssClass, Comparator<ITestResult> comparator)
          {
            pw.append("<table width='100%' border='1' class='invocation-").append(cssClass).append("'>\n")
              .append("<tr><td colspan='4' align='center'><b>").append(title).append("</b></td></tr>\n")
              .append("<tr>")
              .append("<td><b>Test method</b></td>\n")
              .append("<td width=\"30%\"><b>Exception</b></td>\n")
              .append("<td width=\"10%\"><b>Time (seconds)</b></td>\n")
              .append("<td><b>Instance</b></td>\n")
              .append("</tr>\n");

            if (tests instanceof List) {
              Collections.sort((List<ITestResult>) tests, comparator);
            }

            // User output?
            String id;
            Throwable tw;

            for (ITestResult tr : tests) {
              pw.append("<tr>\n");

              // Test method
              ITestNGMethod method = tr.getMethod();

              String name = method.getMethodName();
              pw.append("<td title='").append(tr.getTestClass().getName()).append(".")
                .append(name)
                .append("()'>")
                .append("<b>").append(name).append("</b>");

              // Test class
              String testClass = tr.getTestClass().getName();
              if (testClass != null) {
                pw.append("<br>").append("Test class: ").append(testClass);

                // Test name
                String testName = tr.getTestName();
                if (testName != null) {
                  pw.append(" (").append(testName).append(")");
                }
              }

              // Method description
              if (! Utils.isStringEmpty(method.getDescription())) {
                pw.append("<br>").append("Test method: ").append(method.getDescription());
              }

              Object[] parameters = tr.getParameters();
              if (parameters != null && parameters.length > 0) {
                pw.append("<br>Parameters: ");
                for (int j = 0; j < parameters.length; j++) {
                  if (j > 0) {
                    pw.append(", ");
                  }
                  pw.append(parameters[j] == null ? "null" : parameters[j].toString());
                }
              }

              //
              // Output from the method, created by the user calling Reporter.log()
              //
              {
                List<String> output = Reporter.getOutput(tr);
                if (null != output && output.size() > 0) {
                  pw.append("<br/>");
                  // Method name
                  String divId = "Output-" + tr.hashCode();
                  pw.append("\n<a href=\"#").append(divId).append("\"")
                    .append(" onClick='toggleBox(\"").append(divId).append("\", this, \"Show output\", \"Hide output\");'>")
                    .append("Show output</a>\n")
                    .append("\n<a href=\"#").append(divId).append("\"")
                    .append(" onClick=\"toggleAllBoxes();\">Show all outputs</a>\n")
                    ;

                  // Method output
                  pw.append("<div class='log' id=\"").append(divId).append("\">\n");
                  for (String s : output) {
                    pw.append(s).append("<br/>\n");
                  }
                  pw.append("</div>\n");
                }
              }

              pw.append("</td>\n");


              // Exception
              tw = tr.getThrowable();
              String stackTrace;
              String fullStackTrace;

              id = "stack-trace" + tr.hashCode();
              pw.append("<td>");

              if (null != tw) {
                fullStackTrace = Utils.longStackTrace(tw, true);
                stackTrace = "<div><pre>" + Utils.shortStackTrace(tw, true)  + "</pre></div>";

                pw.append(stackTrace);
                // JavaScript link
                pw.append("<a href='#' onClick='toggleBox(\"")
                .append(id).append("\", this, \"Click to show all stack frames\", \"Click to hide stack frames\")'>")
                .append("Click to show all stack frames").append("</a>\n")
                .append("<div class='stack-trace' id='").append(id).append("'>")
                .append("<pre>").append(fullStackTrace).append("</pre>")
                .append("</div>")
                ;
              }

              pw.append("</td>\n");

              // Time
              long time = (tr.getEndMillis() - tr.getStartMillis()) / 1000;
              String strTime = Long.toString(time);
              pw.append("<td>").append(strTime).append("</td>\n");

              // Instance
              Object instance = tr.getInstance();
              pw.append("<td>").append(Objects.toString(instance)).append("</td>");

              pw.append("</tr>\n");
            }

            pw.append("</table><p>\n");

          }

}