Index: test/src/test/configuration/ConfigurationGroupBothSampleTest.java
===================================================================
--- test/src/test/configuration/ConfigurationGroupBothSampleTest.java	(revisión: 753)
+++ test/src/test/configuration/ConfigurationGroupBothSampleTest.java	(copia de trabajo)
@@ -1,6 +1,7 @@
 package test.configuration;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 import org.testng.annotations.AfterGroups;
@@ -9,7 +10,7 @@
 import org.testng.annotations.Test;
 
 public class ConfigurationGroupBothSampleTest {
-  static List<Integer> m_list = new ArrayList<Integer>();
+  static List<Integer> m_list = Collections.synchronizedList(new ArrayList<Integer>());
   
   @BeforeGroups(groups={"twice"}, value={"twice"})
   public void a(){
Index: test/src/test/thread/DataProviderThreadPoolSizeSampleTest.java
===================================================================
--- test/src/test/thread/DataProviderThreadPoolSizeSampleTest.java	(revisión: 753)
+++ test/src/test/thread/DataProviderThreadPoolSizeSampleTest.java	(copia de trabajo)
@@ -4,6 +4,7 @@
 import org.testng.annotations.DataProvider;
 import org.testng.annotations.Test;
 
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -13,7 +14,7 @@
   @BeforeClass(alwaysRun = true)
   public void setUp() {
     ppp("INIT THREAD IDS");
-    m_threadIds = new HashMap<Long, Long>();    
+    m_threadIds = Collections.synchronizedMap(new HashMap<Long, Long>()); 
   }
   
   @DataProvider(parallel = true)
Index: test/src/test/thread/ThreadPoolSizeTest.java
===================================================================
--- test/src/test/thread/ThreadPoolSizeTest.java	(revisión: 753)
+++ test/src/test/thread/ThreadPoolSizeTest.java	(copia de trabajo)
@@ -1,5 +1,6 @@
 package test.thread;
 
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -13,7 +14,7 @@
   @BeforeClass
   public void setUp() {
     ppp("INIT THREAD IDS");
-    m_threadIds = new HashMap<Long, Long>();    
+    m_threadIds = Collections.synchronizedMap(new HashMap<Long, Long>());    
   }
 
   @Test(invocationCount = 10, threadPoolSize = 3)