Merge pull request #7989 from mbien/fix-evaluator-cme

Fix ConcurrentModificationException on mass Ant project open.

Author: mbien

apisupport/apisupport.ant/src/org/netbeans/modules/apisupport/project/Evaluator.java

@@ -38,6 +38,7 @@
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeMap;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.regex.Matcher;
@@ -889,7 +890,11 @@ private String mergePaths(Set<String> cnbs, boolean test,String testtype,File te
         return cps.toString();
     }
 
-    private static final Map<String, String> limitModulesCache = new HashMap<>();
+    /**
+     * cache shared between Evaluator instances.
+     */
+    private static final Map<String, String> limitModulesCache = new ConcurrentHashMap<>();
+
     private static String getLimitModules(String javacRelease) {
         return limitModulesCache.computeIfAbsent(javacRelease, release -> {
             int maxSupportedSourceVersion = SourceVersion.latest().ordinal();