diff --git a/quarkus/deployment/src/main/java/org/keycloak/quarkus/deployment/KeycloakProcessor.java b/quarkus/deployment/src/main/java/org/keycloak/quarkus/deployment/KeycloakProcessor.java
index 09703ea9c2..bc065b6ff6 100644
--- a/quarkus/deployment/src/main/java/org/keycloak/quarkus/deployment/KeycloakProcessor.java
+++ b/quarkus/deployment/src/main/java/org/keycloak/quarkus/deployment/KeycloakProcessor.java
@@ -314,6 +314,7 @@ class KeycloakProcessor {
         defaultSchema.ifPresent(ds -> unitProperties.setProperty(AvailableSettings.DEFAULT_SCHEMA, ds));
 
         unitProperties.setProperty(AvailableSettings.JAKARTA_TRANSACTION_TYPE, PersistenceUnitTransactionType.JTA.name());
+        descriptor.setTransactionType(PersistenceUnitTransactionType.JTA);
 
         final Optional<String> lockTimeoutConfigValue = getOptionalValue("spi-map-storage-jpa-lock-timeout");
         lockTimeoutConfigValue.ifPresent(v -> unitProperties.setProperty(AvailableSettings.JAKARTA_LOCK_TIMEOUT, v));
diff --git a/quarkus/runtime/src/main/java/org/keycloak/quarkus/runtime/transaction/QuarkusJtaTransactionManagerLookup.java b/quarkus/runtime/src/main/java/org/keycloak/quarkus/runtime/transaction/QuarkusJtaTransactionManagerLookup.java
index b6d36f34f2..61c7627b13 100644
--- a/quarkus/runtime/src/main/java/org/keycloak/quarkus/runtime/transaction/QuarkusJtaTransactionManagerLookup.java
+++ b/quarkus/runtime/src/main/java/org/keycloak/quarkus/runtime/transaction/QuarkusJtaTransactionManagerLookup.java
@@ -19,7 +19,6 @@ package org.keycloak.quarkus.runtime.transaction;
 
 import jakarta.enterprise.inject.spi.CDI;
 import jakarta.transaction.TransactionManager;
-
 import org.jboss.logging.Logger;
 import org.keycloak.Config;
 import org.keycloak.models.KeycloakSessionFactory;
@@ -39,7 +38,7 @@ public class QuarkusJtaTransactionManagerLookup implements JtaTransactionManager
                     tm = CDI.current().select(TransactionManager.class).get();
                     logger.tracev("TransactionManager = {0}", tm);
                     if (tm == null) {
-                        logger.debug("Could not locate JTA TransactionManager. JTA transactions not supported.");
+                        throw new RuntimeException("You must provide JTA TransactionManager as the default transaction type is JTA");
                     }
                 }
             }