From 472fd11d88284037267fbcf4ea467b952a36d5c0 Mon Sep 17 00:00:00 2001
From: Andreas Dangel <andreas.dangel@adangel.org>
Date: Thu, 19 Dec 2024 16:29:03 +0100
Subject: [PATCH] Fix singleton in PerconaConstraintsService

---
 .../liquibase/ext/percona/PerconaConstraintsService.java  | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/main/java/liquibase/ext/percona/PerconaConstraintsService.java b/src/main/java/liquibase/ext/percona/PerconaConstraintsService.java
index 5783450b..072d71ec 100644
--- a/src/main/java/liquibase/ext/percona/PerconaConstraintsService.java
+++ b/src/main/java/liquibase/ext/percona/PerconaConstraintsService.java
@@ -31,12 +31,16 @@
 import liquibase.structure.core.Table;
 
 public class PerconaConstraintsService {
-    private static PerconaConstraintsService instance = new PerconaConstraintsService();
+    private static final PerconaConstraintsService INSTANCE = new PerconaConstraintsService();
     private Logger log = Scope.getCurrentScope().getLog(PerconaConstraintsService.class);
     private boolean enabled = true;
 
+    private PerconaConstraintsService() {
+        // private constructor to prevent instantiation from somewhere else
+    }
+
     public static PerconaConstraintsService getInstance() {
-        return instance;
+        return INSTANCE;
     }
 
     /**