変更箇所1 - 先頭に以下のimportを追加*1

import java.util.concurrent.*;
import java.util.*;

変更箇所2 - 1110行目あたりに以下のstaticメンバを追加

 // スレッドキャッシュはJMeterのスレッドグループ内でそれぞれ生成
 private static ThreadLocal executorServiceThreadCache = new ThreadLocal() {
 protected Object initialValue() {
 return Executors.newCachedThreadPool();
 }
 	};

変更箇所3 - 1172〜1203行目のwhileループを削除し、代わりに以下を記述

 // 画像などのリソースファイルは複数スレッドで一度に取得
 List<Callable<HTTPSampleResult>> downloadTaskList = new ArrayList<Callable<HTTPSampleResult>>();
 while (urls.hasNext()) {
 Object binURL = urls.next();
 try {
 URL url = (URL) binURL;
 if (url == null) {
 log.warn("Null URL detected (should not happen)");
 } else {
 String urlstr = url.toString();
 String urlStrEnc = encodeSpaces(urlstr);
 if (!urlstr.equals(urlStrEnc)) { // There were some spaces in the URL
 try {
 url = new URL(urlStrEnc);
 } catch (MalformedURLException e) {
 res.addSubResult(errorResult(new Exception(urlStrEnc + " is not a correct URI"), res));
 res.setSuccessful(false);
 continue;
 }
 }
 // I don't think localMatcher can be null here, but check just in case
 if (pattern != null && localMatcher != null && !localMatcher.matches(urlStrEnc, pattern)) {
 continue; // we have a pattern and the URL does not match, so skip it
 }
 final int fframeDepth = frameDepth;
 final URL furl = url;
 Callable<HTTPSampleResult> callable = new Callable<HTTPSampleResult>() {
 public HTTPSampleResult call() throws Exception {
 return sample(furl, GET, false, fframeDepth + 1);
 }
 };
 downloadTaskList.add(callable);
 }
 } catch (ClassCastException e) {
 res.addSubResult(errorResult(new Exception(binURL + " is not a correct URI"), res));
 res.setSuccessful(false);
 continue;
 }
 }
 try {
 ExecutorService executorService = (ExecutorService) executorServiceThreadCache.get();
 List<Future<HTTPSampleResult>> futureList = executorService.invokeAll(downloadTaskList);
 for (Future<HTTPSampleResult> future : futureList) {
 try {
 HTTPSampleResult binRes = future.get();
 res.addSubResult(binRes);
 res.setSuccessful(res.isSuccessful() && binRes.isSuccessful());
 } catch (ExecutionException ee) {
 res.addSubResult(errorResult(new Exception(" is not a correct URI"), res));
 res.setSuccessful(false);
 }
 }
 } catch (InterruptedException e) {
 res.addSubResult(errorResult(new Exception(" is not a correct URI"), res));
 res.setSuccessful(false);
 }

変更点1 - 203行目の「threadCache = new ThreadLocal(){」を以下に変更

 threadCache = new InheritableThreadLocal() {

変更点2 - 205行目の「return new HashMap();」を以下に変更

 return java.util.Collections.synchronizedMap(new HashMap());

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