From b914623cf2a27ae7cc92b3528111e9415becc6f2 Mon Sep 17 00:00:00 2001
From: Szymon Sasin <szymon.sasin@gmail.com>
Date: Mon, 26 Aug 2024 16:00:16 +0300
Subject: [PATCH] fix

---
 .../main/java/com/mbed/coap/server/CoapServerBuilder.java | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/coap-core/src/main/java/com/mbed/coap/server/CoapServerBuilder.java b/coap-core/src/main/java/com/mbed/coap/server/CoapServerBuilder.java
index 539db44b..670cd45d 100644
--- a/coap-core/src/main/java/com/mbed/coap/server/CoapServerBuilder.java
+++ b/coap-core/src/main/java/com/mbed/coap/server/CoapServerBuilder.java
@@ -138,10 +138,10 @@ public CoapServerBuilder maxIncomingBlockTransferSize(int size) {
     }
 
     private PutOnlyMap<CoapRequestId, CoapPacket> getOrCreateDuplicateDetectorCache(ScheduledExecutorService scheduledExecutorService) {
-        if (duplicateDetectionCache == null) {
-            duplicateDetectionCache = new DefaultDuplicateDetectorCache("Default cache", duplicationMaxSize, scheduledExecutorService);
+        if (duplicateDetectionCache != null) {
+            return duplicateDetectionCache;
         }
-        return duplicateDetectionCache;
+        return new DefaultDuplicateDetectorCache("Default cache", duplicationMaxSize, scheduledExecutorService);
     }
 
     private CapabilitiesResolver capabilities() {
@@ -208,7 +208,7 @@ public CoapServerBuilder requestTagSupplier(RequestTagSupplier requestTagSupplie
     }
 
     public CoapServer build() {
-        requireNonNull(coapTransport, "Missing transport");
+        CoapTransport coapTransport = requireNonNull(this.coapTransport, "Missing transport");
         final boolean stopExecutor = scheduledExecutorService == null;
         final ScheduledExecutorService effectiveExecutorService = scheduledExecutorService != null ? scheduledExecutorService : Executors.newSingleThreadScheduledExecutor();
         Timer timer = toTimer(effectiveExecutorService);