diff --git a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/Message.java b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/Message.java
index 7881ff655..8f1b6c5ca 100644
--- a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/Message.java
+++ b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/Message.java
@@ -85,6 +85,7 @@ public class Message extends AbstractAuditingEntity<Message, Long> implements Se
     @OneToMany(fetch = FetchType.LAZY, mappedBy = "message", cascade = CascadeType.ALL, orphanRemoval = true)
     private final Set<MessageHeader> headers = new HashSet<>();
 
+    @ToString.Exclude
     @ManyToOne(fetch = FetchType.LAZY)
     @JsonIgnoreProperties(value = {"scenarioParameters", "scenarioActions", "scenarioMessages"}, allowSetters = true)
     private ScenarioExecution scenarioExecution;
diff --git a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/MessageHeader.java b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/MessageHeader.java
index d6d309b3c..4834a77cc 100644
--- a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/MessageHeader.java
+++ b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/MessageHeader.java
@@ -64,6 +64,7 @@ public class MessageHeader extends AbstractAuditingEntity<MessageHeader, Long> i
     private String value;
 
     @NotNull
+    @ToString.Exclude
     @ManyToOne(optional = false)
     @JoinColumn(nullable = false)
     @JsonIgnoreProperties(value = {"headers", "scenarioExecution"}, allowSetters = true)
diff --git a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/ScenarioAction.java b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/ScenarioAction.java
index 012b55006..aaacd06eb 100644
--- a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/ScenarioAction.java
+++ b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/ScenarioAction.java
@@ -62,6 +62,7 @@ public class ScenarioAction implements Serializable {
     private Instant endDate;
 
     @ManyToOne
+    @ToString.Exclude
     @JsonIgnoreProperties(value = { "scenarioParameters", "scenarioActions", "scenarioMessages" }, allowSetters = true)
     private ScenarioExecution scenarioExecution;
 
diff --git a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/ScenarioParameter.java b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/ScenarioParameter.java
index 84f59a565..ea564a59e 100644
--- a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/ScenarioParameter.java
+++ b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/ScenarioParameter.java
@@ -76,6 +76,7 @@ public class ScenarioParameter extends AbstractAuditingEntity<ScenarioParameter,
     private String value;
 
     @ManyToOne
+    @ToString.Exclude
     @JsonIgnoreProperties(value = {"scenarioParameters", "scenarioActions", "scenarioMessages"}, allowSetters = true)
     private ScenarioExecution scenarioExecution;
 
diff --git a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/TestParameter.java b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/TestParameter.java
index afb2ffb50..0fd33e4cd 100644
--- a/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/TestParameter.java
+++ b/simulator-spring-boot/src/main/java/org/citrusframework/simulator/model/TestParameter.java
@@ -72,6 +72,7 @@ public class TestParameter extends AbstractAuditingEntity<TestParameter, TestPar
 
     @NotNull
     @ManyToOne
+    @ToString.Exclude
     @MapsId("testResultId")
     @JoinColumn(name = "test_result_id", nullable = false)
     @JsonIgnoreProperties(value = { "testParameters" }, allowSetters = true)