test/hotspot/jtreg/runtime/linkResolver/NoSuchFieldOutputTest.java

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/*
 * @test
 * @bug 8298065
 * @summary Test output of NoSuchFieldError when field signature does not match
 * @compile NoSuchFieldPrimitive.jasm NoSuchFieldReference.jasm TestClass.java
 * @compile NoSuchFieldArray.jasm NoSuchFieldMultiArray.jasm
 * @run main NoSuchFieldOutputTest
 */

import java.util.regex.Matcher;
import java.util.regex.Pattern;

// Tests the output text of NoSuchFieldError
public class NoSuchFieldOutputTest {

  public static void main(java.lang.String[] unused) throws Exception {
    try {
      Class.forName("NoSuchFieldPrimitive").newInstance();
    } catch (NoSuchFieldError nsfe) {
      testNoSuchFieldOutput(nsfe, "primitive");
    }
    try {
      Class.forName("NoSuchFieldReference").newInstance();
    } catch (NoSuchFieldError nsfe) {
      testNoSuchFieldOutput(nsfe, "reference");
    }
    try {
      Class.forName("NoSuchFieldArray").newInstance();
    } catch (NoSuchFieldError nsfe) {
      testNoSuchFieldOutput(nsfe, "array");
    }
    try {
      Class.forName("NoSuchFieldMultiArray").newInstance();
    } catch (NoSuchFieldError nsfe) {
      testNoSuchFieldOutput(nsfe, "multiArray");
    }
  }

  private static void testNoSuchFieldOutput(NoSuchFieldError nsfe, String testType) throws Exception {
    Pattern noSuchFieldPattern = Pattern.compile("Class (?<classname>[\\w\\d]+) does not have member field '(?<signature>[\\S]+) (?<varname>[\\w\\d]+)'");
    String output = nsfe.getMessage();
    Matcher noSuchFieldMatcher = noSuchFieldPattern.matcher(output);
    if (noSuchFieldMatcher.matches()) {
      switch (testType) {
      case "primitive":
        checkOutputGroups(noSuchFieldMatcher, output, "NoSuchFieldPrimitive", "int", "x");
        break;
      case "reference":
        checkOutputGroups(noSuchFieldMatcher, output, "NoSuchFieldReference", "TestClass", "y");
        break;
      case "array":
        checkOutputGroups(noSuchFieldMatcher, output, "NoSuchFieldArray", "char[]", "z");
        break;
      case "multiArray":
        checkOutputGroups(noSuchFieldMatcher, output, "NoSuchFieldMultiArray", "double[][]", "a");
        break;
      default:
        throwTestException("No matching test", output);
      }
    } else {
      throwTestException("Output format does not match", output);
    }
    System.out.println(output);
  }

  private static void checkOutputGroups(Matcher noSuchFieldMatcher, String output,
                                 String testClass, String testSig, String testVar) throws Exception {
    String classname = noSuchFieldMatcher.group("classname");
    String signature = noSuchFieldMatcher.group("signature");
    String varname   = noSuchFieldMatcher.group("varname");
    if (!classname.equals(testClass)) {
      throwTestException("Failed to match class name", output);
    }
    if (!signature.equals(testSig)) {
      throwTestException("Failed to match type signature", output);
    }
    if (!varname.equals(testVar)) {
      throwTestException("Failed to match field name", output);
    }
  }

  private static void throwTestException(String reason, String output) throws Exception {
      throw new Exception(reason + " . Stdout is :\n" + output);
  }
}