Program: 54857
Project: 54857
Buggy source:
/** 
 * Downloads the public keys from the public certificates endpoint at  {@code "https://www.googleapis.com/oauth2/v1/certs"}. <p> This method is automatically called if the public keys have not yet been initialized or if the expiration time is very close, so normally this doesn't need to be called. Only call this method explicitly to force the public keys to be updated. </p>
 */
public GoogleIdTokenVerifier loadPublicCerts() throws GeneralSecurityException, IOException {
  lock.lock();
  try {
    publicKeys=new ArrayList<PublicKey>();
    CertificateFactory factory=CertificateFactory.getInstance("String_Node_Str");
    HttpResponse certsResponse=transport.createRequestFactory().buildGetRequest(new GenericUrl("String_Node_Str")).execute();
    for (    String arg : certsResponse.getHeaders().getCacheControl().split("String_Node_Str")) {
      Matcher m=MAX_AGE_PATTERN.matcher(arg);
      if (m.matches()) {
        expirationTimeMilliseconds=clock.currentTimeMillis() + Long.valueOf(m.group(1)) * 1000;
        break;
      }
    }
    JsonParser parser=jsonFactory.createJsonParser(certsResponse.getContent());
    try {
      while (parser.nextToken() != JsonToken.END_OBJECT) {
        parser.nextToken();
        String certValue=parser.getText();
        X509Certificate x509Cert=(X509Certificate)factory.generateCertificate(new ByteArrayInputStream(StringUtils.getBytesUtf8(certValue)));
        publicKeys.add(x509Cert.getPublicKey());
      }
      publicKeys=Collections.unmodifiableList(publicKeys);
    }
  finally {
      parser.close();
    }
    return this;
  }
  finally {
    lock.unlock();
  }
}

Fixed version (ground truth):
/** 
 * Downloads the public keys from the public certificates endpoint at  {@code "https://www.googleapis.com/oauth2/v1/certs"}. <p> This method is automatically called if the public keys have not yet been initialized or if the expiration time is very close, so normally this doesn't need to be called. Only call this method explicitly to force the public keys to be updated. </p>
 */
public GoogleIdTokenVerifier loadPublicCerts() throws GeneralSecurityException, IOException {
  lock.lock();
  try {
    publicKeys=new ArrayList<PublicKey>();
    CertificateFactory factory=CertificateFactory.getInstance("String_Node_Str");
    HttpResponse certsResponse=transport.createRequestFactory().buildGetRequest(new GenericUrl("String_Node_Str")).execute();
    for (    String arg : certsResponse.getHeaders().getCacheControl().split("String_Node_Str")) {
      Matcher m=MAX_AGE_PATTERN.matcher(arg);
      if (m.matches()) {
        expirationTimeMilliseconds=clock.currentTimeMillis() + Long.valueOf(m.group(1)) * 1000;
        break;
      }
    }
    JsonParser parser=jsonFactory.createJsonParser(certsResponse.getContent());
    JsonToken currentToken=parser.getCurrentToken();
    if (currentToken == null) {
      currentToken=parser.nextToken();
    }
    Preconditions.checkArgument(currentToken == JsonToken.START_OBJECT);
    try {
      while (parser.nextToken() != JsonToken.END_OBJECT) {
        parser.nextToken();
        String certValue=parser.getText();
        X509Certificate x509Cert=(X509Certificate)factory.generateCertificate(new ByteArrayInputStream(StringUtils.getBytesUtf8(certValue)));
        publicKeys.add(x509Cert.getPublicKey());
      }
      publicKeys=Collections.unmodifiableList(publicKeys);
    }
  finally {
      parser.close();
    }
    return this;
  }
  finally {
    lock.unlock();
  }
}