don't use `JsonProvider.getPropertyKeys(Object)` to query a list/array's indexes

json-path/src/main/java/com/jayway/jsonpath/internal/compiler/ScanPathToken.java

@@ -197,8 +197,11 @@ public class ScanPathToken extends PathToken {
 
       @Override
       public boolean matches(Object model) {
-          Collection<String> keys = ctx.jsonProvider().getPropertyKeys(model);
-          return keys.containsAll(propertyPathToken.getProperties());
+          if(ctx.jsonProvider().isMap(model)){
+            Collection<String> keys = ctx.jsonProvider().getPropertyKeys(model);
+            return keys.containsAll(propertyPathToken.getProperties());
+          }
+          return false;
       }
     }
 }

json-path/src/main/java/com/jayway/jsonpath/internal/spi/json/AbstractJsonProvider.java

@@ -96,20 +96,15 @@ public abstract class AbstractJsonProvider implements JsonProvider {
     }
 
     /**
-     * Returns the keys from the given object or the indexes from an array
+     * Returns the keys from the given object
      *
-     * @param obj an array or an object
-     * @return the keys for an object or the indexes for an array
+     * @param obj an object
+     * @return the keys for an object
      */
     @SuppressWarnings("unchecked")
     public Collection<String> getPropertyKeys(Object obj) {
         if (isArray(obj)) {
-            List l = (List) obj;
-            List<String> keys = new ArrayList<String>(l.size());
-            for (int i = 0; i < l.size(); i++) {
-                keys.add(String.valueOf(i));
-            }
-            return keys;
+          throw new UnsupportedOperationException();
         } else {
             return ((Map) obj).keySet();
         }

json-path/src/main/java/com/jayway/jsonpath/spi/json/JsonProvider.java

@@ -62,10 +62,10 @@ public interface JsonProvider {
 
 
     /**
-     * Returns the keys from the given object or the indexes from an array
+     * Returns the keys from the given object
      *
-     * @param obj an array or an object
-     * @return the keys for an object or the indexes for an array
+     * @param obj an object
+     * @return the keys for an object
      */
     Collection<String> getPropertyKeys(Object obj);