From fb269c9e64ea08ad46a72002963ced2f18bfc8b9 Mon Sep 17 00:00:00 2001
From: Dzung Bui <dungba.sg@gmail.com>
Date: Sat, 9 Dec 2023 02:59:39 +0900
Subject: [PATCH] Fix NPE on off-heap test and FST is null (#12894)

---
 .../org/apache/lucene/tests/util/fst/FSTTester.java   | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/lucene/test-framework/src/java/org/apache/lucene/tests/util/fst/FSTTester.java b/lucene/test-framework/src/java/org/apache/lucene/tests/util/fst/FSTTester.java
index d80cbf58dc4..07f877575b0 100644
--- a/lucene/test-framework/src/java/org/apache/lucene/tests/util/fst/FSTTester.java
+++ b/lucene/test-framework/src/java/org/apache/lucene/tests/util/fst/FSTTester.java
@@ -283,14 +283,17 @@ public class FSTTester<T> {
       }
     }
     FST<T> fst = fstCompiler.compile();
-    ;
 
     if (useOffHeap) {
       indexOutput.close();
-      try (IndexInput in = dir.openInput("fstOffHeap.bin", IOContext.DEFAULT)) {
-        fst = new FST<>(fst.getMetadata(), in);
-      } finally {
+      if (fst == null) {
         dir.deleteFile("fstOffHeap.bin");
+      } else {
+        try (IndexInput in = dir.openInput("fstOffHeap.bin", IOContext.DEFAULT)) {
+          fst = new FST<>(fst.getMetadata(), in);
+        } finally {
+          dir.deleteFile("fstOffHeap.bin");
+        }
       }
     } else if (random.nextBoolean() && fst != null) {
       IOContext context = LuceneTestCase.newIOContext(random);