diff --git a/core/persistence-jpa/src/main/java/org/apache/syncope/core/persistence/jpa/dao/JPAConnInstanceDAO.java b/core/persistence-jpa/src/main/java/org/apache/syncope/core/persistence/jpa/dao/JPAConnInstanceDAO.java
index 4be0788..9f4e6e5 100644
--- a/core/persistence-jpa/src/main/java/org/apache/syncope/core/persistence/jpa/dao/JPAConnInstanceDAO.java
+++ b/core/persistence-jpa/src/main/java/org/apache/syncope/core/persistence/jpa/dao/JPAConnInstanceDAO.java
@@ -36,6 +36,7 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Lazy;
 import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
 
 @Repository
 public class JPAConnInstanceDAO extends AbstractDAO<ConnInstance> implements ConnInstanceDAO {
@@ -50,11 +51,13 @@
     @Autowired
     private ConnectorRegistry connRegistry;
 
+    @Transactional(readOnly = true)
     @Override
     public ConnInstance find(final String key) {
         return entityManager().find(JPAConnInstance.class, key);
     }
 
+    @Transactional(readOnly = true)
     @Override
     public ConnInstance authFind(final String key) {
         ConnInstance connInstance = find(key);