JOHNZON-315 avoid infinite loop when getPackage is not available
diff --git a/johnzon-jsonb/src/main/java/org/apache/johnzon/jsonb/DefaultPropertyVisibilityStrategy.java b/johnzon-jsonb/src/main/java/org/apache/johnzon/jsonb/DefaultPropertyVisibilityStrategy.java
index 467b563..5f59471 100644
--- a/johnzon-jsonb/src/main/java/org/apache/johnzon/jsonb/DefaultPropertyVisibilityStrategy.java
+++ b/johnzon-jsonb/src/main/java/org/apache/johnzon/jsonb/DefaultPropertyVisibilityStrategy.java
@@ -75,6 +75,7 @@
             if (end < 0) {
                 break;
             }
+            p = null;
             final String parentPack = name.substring(0, end);
             if (!skipGetpackage) {
                 try {