X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=yang%2Fyang-data-impl%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fyangtools%2Fyang%2Fdata%2Fimpl%2Fcodec%2Fxml%2FRandomPrefix.java;h=125ac23eb86fd057551e821e76fa757b0f2a36bf;hb=refs%2Fchanges%2F06%2F18006%2F1;hp=518e796808d9676519e201d89db4dfabc1e90140;hpb=39d7b73815011c0f4388eadeea14a45794f89cac;p=yangtools.git

diff --git a/yang/yang-data-impl/src/main/java/org/opendaylight/yangtools/yang/data/impl/codec/xml/RandomPrefix.java b/yang/yang-data-impl/src/main/java/org/opendaylight/yangtools/yang/data/impl/codec/xml/RandomPrefix.java
index 518e796808..125ac23eb8 100644
--- a/yang/yang-data-impl/src/main/java/org/opendaylight/yangtools/yang/data/impl/codec/xml/RandomPrefix.java
+++ b/yang/yang-data-impl/src/main/java/org/opendaylight/yangtools/yang/data/impl/codec/xml/RandomPrefix.java
@@ -15,6 +15,7 @@ import com.google.common.collect.HashBiMap;
 import java.net.URI;
 import java.util.Map;
 
+import javax.xml.XMLConstants;
 import javax.xml.namespace.NamespaceContext;
 
 class RandomPrefix {
@@ -57,7 +58,12 @@ class RandomPrefix {
     }
 
     private boolean alreadyUsedPrefix(final String prefix) {
-        return context != null && context.getNamespaceURI(prefix) != null;
+        if (context == null) {
+            return false;
+        }
+
+        final String str = context.getNamespaceURI(prefix);
+        return !XMLConstants.NULL_NS_URI.equals(str);
     }
 
     @VisibleForTesting