Avoid ConcurrentHashMapModification Exception

plugins/org.eclipse.libra.warproducts.ui/src/org/eclipse/libra/warproducts/ui/validation/WARProductValidateAction.java

diff --git a/plugins/org.eclipse.libra.warproducts.ui/src/org/eclipse/libra/warproducts/ui/validation/WARProductValidateAction.java b/plugins/org.eclipse.libra.warproducts.ui/src/org/eclipse/libra/warproducts/ui/validation/WARProductValidateAction.java
index 87d134f..068456e 100644
--- a/plugins/org.eclipse.libra.warproducts.ui/src/org/eclipse/libra/warproducts/ui/validation/WARProductValidateAction.java
+++ b/plugins/org.eclipse.libra.warproducts.ui/src/org/eclipse/libra/warproducts/ui/validation/WARProductValidateAction.java
@@ -10,7 +10,6 @@
 package org.eclipse.libra.warproducts.ui.validation;
 
 import java.util.*;
-import java.util.Map.Entry;
 
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.NullProgressMonitor;
@@ -112,9 +111,11 @@
   }
 
   private static void verifyPDEErrors( final Map<Object,Object[]> map ) {
-    for(final Entry<?,?> entry: map.entrySet()){
-      Object currentKey = entry.getKey();
-      ResolverError[] errors = (ResolverError[]) entry.getValue();
+    final ArrayList<Object> keys = new ArrayList<Object>(map.size());
+    keys.addAll( map.keySet() );
+    
+    for(final Object currentKey: keys){
+      ResolverError[] errors = (ResolverError[]) map.get( currentKey );
       ResolverError[] validErrors = validateErrors( errors );
       map.remove( currentKey );
       if( validErrors.length > 0 ) {