Use reflection for DefaultLocaleResolver to avoid internal HV import

The DefaultLocaleResolver is in org.hibernate.validator.internal which
is not exported by the HV bundle.  Use reflection to instantiate it
via HV's classloader, avoiding a direct package import that would fail
OSGi feature resolution.

Author: jbonofre

components/camel-bean-validator/src/main/java/org/apache/camel/component/bean/validator/ValidatorFactories.java

@@ -31,8 +31,8 @@
 import org.apache.camel.support.CamelContextHelper;
 import org.hibernate.validator.HibernateValidator;
 import org.hibernate.validator.HibernateValidatorConfiguration;
-import org.hibernate.validator.internal.engine.messageinterpolation.DefaultLocaleResolver;
 import org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator;
+import org.hibernate.validator.spi.messageinterpolation.LocaleResolver;
 
 /**
  * OSGi-aware override of the upstream ValidatorFactories.
@@ -94,7 +94,7 @@ public static ValidatorFactory buildValidatorFactory(
                 // ExpressionFactory parameter and calls buildExpressionFactory().
                 messageInterpolator = new ResourceBundleMessageInterpolator(
                         null, Collections.emptySet(), Locale.getDefault(),
-                        new DefaultLocaleResolver(), true, false, ef);
+                        createDefaultLocaleResolver(hvCl), true, false, ef);
             }
         }
 
@@ -126,4 +126,18 @@ private static ExpressionFactory createExpressionFactory(ClassLoader hvCl) {
             return null;
         }
     }
+
+    /**
+     * Create the HV DefaultLocaleResolver via reflection to avoid importing
+     * the internal package which is not exported by the HV bundle.
+     */
+    private static LocaleResolver createDefaultLocaleResolver(ClassLoader hvCl) {
+        try {
+            Class<?> clazz = hvCl.loadClass(
+                    "org.hibernate.validator.internal.engine.messageinterpolation.DefaultLocaleResolver");
+            return (LocaleResolver) clazz.getDeclaredConstructor().newInstance();
+        } catch (Exception e) {
+            return null;
+        }
+    }
 }