diff --git a/src/test/java/org/apache/commons/collections4/BulkTest.java b/src/test/java/org/apache/commons/collections4/BulkTest.java
index 174622748..e21c5e920 100644
--- a/src/test/java/org/apache/commons/collections4/BulkTest.java
+++ b/src/test/java/org/apache/commons/collections4/BulkTest.java
@@ -137,6 +137,17 @@ import junit.framework.TestSuite;
  */
 public class BulkTest extends TestCase implements Cloneable {
 
+    /**
+     * IBM JDK 1.6.0 has several bugs in their java.util.TreeMap implementation.
+     */
+    protected static final boolean IBMJDK16;
+    static {
+        final String vmName = System.getProperty("java.vm.name");
+        final String version = System.getProperty("java.version");
+
+        IBMJDK16 = vmName != null  && vmName.equals("IBM J9 VM") &&
+                   version != null && version.equals("1.6.0");
+    }
 
     // Note:  BulkTest is Cloneable to make it easier to construct
     // BulkTest instances for simple test methods that are defined in
diff --git a/src/test/java/org/apache/commons/collections4/bidimap/DualTreeBidiMap2Test.java b/src/test/java/org/apache/commons/collections4/bidimap/DualTreeBidiMap2Test.java
index 29f84ef27..185955996 100644
--- a/src/test/java/org/apache/commons/collections4/bidimap/DualTreeBidiMap2Test.java
+++ b/src/test/java/org/apache/commons/collections4/bidimap/DualTreeBidiMap2Test.java
@@ -155,27 +155,21 @@ public class DualTreeBidiMap2Test<K extends Comparable<K>, V extends Comparable<
     public String[] ignoredTests() {
         String recursiveTest = "DualTreeBidiMap2Test.bulkTestInverseMap.bulkTestInverseMap";
 
-        // there are several bugs in the following JVM:
-        // IBM J9 VM build 2.4, JRE 1.6.0 IBM J9 2.4 Linux x86-32 jvmxi3260sr12-20121024_126067
-        // thus disabling tests related to these bugs
-
-        final String vmName = System.getProperty("java.vm.name");
-        final String version = System.getProperty("java.version");
-
-        if (vmName == null || version == null) {
-            return new String[] { recursiveTest };
-        }
-
-        if (vmName.equals("IBM J9 VM") && version.equals("1.6.0")) {
-            final String preSub = "DualTreeBidiMap2Test.bulkTestSubMap.bulkTestMap";
-            final String preTail = "DualTreeBidiMap2Test.bulkTestTailMap.bulkTestMap";
+        if (IBMJDK16) {
+            final String preSub = "DualTreeBidiMap2Test.bulkTestSubMap.";
+            final String preTail = "DualTreeBidiMap2Test.bulkTestTailMap.";
             return new String[] {
                     recursiveTest,
-                    preSub + "EntrySet.testCollectionIteratorRemove",
-                    preSub + "Values.testCollectionIteratorRemove",
-                    preTail + "Values.testCollectionClear",
-                    preTail + "Values.testCollectionRemoveAll",
-                    preTail + "Values.testCollectionRetainAll"
+                    preSub + "bulkTestMapEntrySet.testCollectionIteratorRemove",
+                    preSub + "bulkTestMapValues.testCollectionIteratorRemove",
+                    preTail + "testMapRemove",
+                    preTail + "bulkTestMapEntrySet.testCollectionIteratorRemove",
+                    preTail + "bulkTestMapEntrySet.testCollectionRemoveAll",
+                    preTail + "bulkTestMapKeySet.testCollectionIteratorRemove",
+                    preTail + "bulkTestMapKeySet.testCollectionRemoveAll",                    
+                    preTail + "bulkTestMapValues.testCollectionClear",
+                    preTail + "bulkTestMapValues.testCollectionRemoveAll",
+                    preTail + "bulkTestMapValues.testCollectionRetainAll"
             };
         } else {
             return new String[] { recursiveTest };
diff --git a/src/test/java/org/apache/commons/collections4/bidimap/DualTreeBidiMapTest.java b/src/test/java/org/apache/commons/collections4/bidimap/DualTreeBidiMapTest.java
index 235e76ba0..510162850 100644
--- a/src/test/java/org/apache/commons/collections4/bidimap/DualTreeBidiMapTest.java
+++ b/src/test/java/org/apache/commons/collections4/bidimap/DualTreeBidiMapTest.java
@@ -48,29 +48,23 @@ public class DualTreeBidiMapTest<K extends Comparable<K>, V extends Comparable<V
      */
     @Override
     public String[] ignoredTests() {
-        String recursiveTest = "DualTreeBidiMapTest.bulkTestInverseMap.bulkTestInverseMap";
+        final String recursiveTest = "DualTreeBidiMapTest.bulkTestInverseMap.bulkTestInverseMap";
 
-        // there are several bugs in the following JVM:
-        // IBM J9 VM build 2.4, JRE 1.6.0 IBM J9 2.4 Linux x86-32 jvmxi3260sr12-20121024_126067
-        // thus disabling tests related to these bugs
-
-        final String vmName = System.getProperty("java.vm.name");
-        final String version = System.getProperty("java.version");
-
-        if (vmName == null || version == null) {
-            return new String[] { recursiveTest };
-        }
-
-        if (vmName.equals("IBM J9 VM") && version.equals("1.6.0")) {
-            final String preSub = "DualTreeBidiMapTest.bulkTestSubMap.bulkTestMap";
-            final String preTail = "DualTreeBidiMapTest.bulkTestTailMap.bulkTestMap";
+        if (IBMJDK16) {
+            final String preSub = "DualTreeBidiMapTest.bulkTestSubMap.";
+            final String preTail = "DualTreeBidiMapTest.bulkTestTailMap.";
             return new String[] {
                     recursiveTest,
-                    preSub + "EntrySet.testCollectionIteratorRemove",
-                    preSub + "Values.testCollectionIteratorRemove",
-                    preTail + "Values.testCollectionClear",
-                    preTail + "Values.testCollectionRemoveAll",
-                    preTail + "Values.testCollectionRetainAll"
+                    preSub + "bulkTestMapEntrySet.testCollectionIteratorRemove",
+                    preSub + "bulkTestMapValues.testCollectionIteratorRemove",
+                    preTail + "testMapRemove",
+                    preTail + "bulkTestMapEntrySet.testCollectionIteratorRemove",
+                    preTail + "bulkTestMapEntrySet.testCollectionRemoveAll",
+                    preTail + "bulkTestMapKeySet.testCollectionIteratorRemove",
+                    preTail + "bulkTestMapKeySet.testCollectionRemoveAll",                    
+                    preTail + "bulkTestMapValues.testCollectionClear",
+                    preTail + "bulkTestMapValues.testCollectionRemoveAll",
+                    preTail + "bulkTestMapValues.testCollectionRetainAll"
             };
         } else {
             return new String[] { recursiveTest };
diff --git a/src/test/java/org/apache/commons/collections4/map/TransformedSortedMapTest.java b/src/test/java/org/apache/commons/collections4/map/TransformedSortedMapTest.java
index 539cba182..ab02f7a44 100644
--- a/src/test/java/org/apache/commons/collections4/map/TransformedSortedMapTest.java
+++ b/src/test/java/org/apache/commons/collections4/map/TransformedSortedMapTest.java
@@ -47,27 +47,21 @@ public class TransformedSortedMapTest<K, V> extends AbstractSortedMapTest<K, V>
 
     @Override
     public String[] ignoredTests() {
-        // there are several bugs in the following JVM:
-        // IBM J9 VM build 2.4, JRE 1.6.0 IBM J9 2.4 Linux x86-32 jvmxi3260sr12-20121024_126067
-        // thus disabling tests related to these bugs
-
-        final String vmName = System.getProperty("java.vm.name");
-        final String version = System.getProperty("java.version");
-
-        if (vmName == null || version == null) {
-            return null;
-        }
-
-        if (vmName.equals("IBM J9 VM") && version.equals("1.6.0")) {
-            final String preSubMap = "TransformedSortedMapTest.bulkTestSubMap.bulkTestMap";
-            final String preTailMap = "TransformedSortedMapTest.bulkTestTailMap.bulkTestMap";
+        if (IBMJDK16) {
+            final String preSubMap = "TransformedSortedMapTest.bulkTestSubMap.";
+            final String preTailMap = "TransformedSortedMapTest.bulkTestTailMap.";
             return new String[] {
-                    preSubMap + "EntrySet.testCollectionIteratorRemove",
-                    preSubMap + "KeySet.testCollectionRemove",
-                    preSubMap + "Values.testCollectionIteratorRemove",
-                    preTailMap + "Values.testCollectionClear",
-                    preTailMap + "Values.testCollectionRemoveAll",
-                    preTailMap + "Values.testCollectionRetainAll"
+                    preSubMap + "bulkTestMapEntrySet.testCollectionIteratorRemove",
+                    preSubMap + "bulkTestMapKeySet.testCollectionRemove",
+                    preSubMap + "bulkTestMapValues.testCollectionIteratorRemove",
+                    preTailMap + "testMapRemove",
+                    preTailMap + "bulkTestMapEntrySet.testCollectionIteratorRemove",
+                    preTailMap + "bulkTestMapEntrySet.testCollectionRemoveAll",
+                    preTailMap + "bulkTestMapKeySet.testCollectionIteratorRemove",
+                    preTailMap + "bulkTestMapKeySet.testCollectionRemoveAll",                    
+                    preTailMap + "bulkTestMapValues.testCollectionClear",
+                    preTailMap + "bulkTestMapValues.testCollectionRemoveAll",
+                    preTailMap + "bulkTestMapValues.testCollectionRetainAll"
             };
         } else {
             return null;
diff --git a/src/test/java/org/apache/commons/collections4/trie/UnmodifiableTrieTest.java b/src/test/java/org/apache/commons/collections4/trie/UnmodifiableTrieTest.java
index e4eb48be0..3cc00dfe5 100644
--- a/src/test/java/org/apache/commons/collections4/trie/UnmodifiableTrieTest.java
+++ b/src/test/java/org/apache/commons/collections4/trie/UnmodifiableTrieTest.java
@@ -88,6 +88,23 @@ public class UnmodifiableTrieTest<V> extends AbstractSortedMapTest<String, V> {
 
     //-----------------------------------------------------------------------
 
+    /**
+     * Override to prevent infinite recursion of tests.
+     */
+    @Override
+    public String[] ignoredTests() {
+        if (IBMJDK16) {
+            final String prefix = "UnmodifiableTrieTest.";
+            return new String[] {
+                    prefix + "bulkTestHeadMap.bulkTestMapEntrySet.testCollectionToArray2",
+                    prefix + "bulkTestTailMap.bulkTestMapEntrySet.testCollectionToArray2",
+                    prefix + "bulkTestSubMap.bulkTestMapEntrySet.testCollectionToArray2"
+            };
+        } else {
+            return null;
+        }
+    }
+
     @Override
     public String getCompatibilityVersion() {
         return "4";