diff --git a/querydsl-lucene/src/main/java/com/mysema/query/lucene/session/impl/LuceneSessionImpl.java b/querydsl-lucene/src/main/java/com/mysema/query/lucene/session/impl/LuceneSessionImpl.java
index d98b34b74..f93c67fec 100644
--- a/querydsl-lucene/src/main/java/com/mysema/query/lucene/session/impl/LuceneSessionImpl.java
+++ b/querydsl-lucene/src/main/java/com/mysema/query/lucene/session/impl/LuceneSessionImpl.java
@@ -1,5 +1,7 @@
 package com.mysema.query.lucene.session.impl;
 
+import javax.annotation.Nullable;
+
 import com.mysema.query.QueryException;
 import com.mysema.query.lucene.LuceneQuery;
 import com.mysema.query.lucene.LuceneSerializer;
@@ -16,8 +18,10 @@ public class LuceneSessionImpl implements LuceneSession {
 
     private final LuceneSessionFactoryImpl sessionFactory;
 
+    @Nullable
     private LuceneSearcher searcher;
 
+    @Nullable
     private LuceneWriterImpl writer;
 
     private final LuceneSerializer serializer = new LuceneSerializer(true, true);