1 files changed, 3 insertions, 3 deletions
diff --git a/src/main/java/org/traccar/protocol/SpotProtocolDecoder.java b/src/main/java/org/traccar/protocol/SpotProtocolDecoder.java
index da36c2048..34417d95f 100644
--- a/src/main/java/org/traccar/protocol/SpotProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/SpotProtocolDecoder.java
@@ -42,9 +42,9 @@ import java.util.List;
 
 public class SpotProtocolDecoder extends BaseHttpProtocolDecoder {
 
-    private DocumentBuilder documentBuilder;
-    private XPath xPath;
-    private XPathExpression messageExpression;
+    private final DocumentBuilder documentBuilder;
+    private final XPath xPath;
+    private final XPathExpression messageExpression;
 
     public SpotProtocolDecoder(Protocol protocol) {
         super(protocol);