diff --git a/src/main/java/com/devonfw/sample/archunit/violation/common/ApplicationPersistenceEntity.java b/src/main/java/com/devonfw/sample/archunit/violation/common/ApplicationPersistenceEntity.java
new file mode 100644
index 0000000..ecbcbfb
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/common/ApplicationPersistenceEntity.java
@@ -0,0 +1,14 @@
+package com.devonfw.sample.archunit.violation.common;
+
+import javax.persistence.MappedSuperclass;
+
+import com.devonfw.sample.archunit.general.common.ApplicationEntity;
+
+/**
+ * Abstract base class for all persistent entities of this app.
+ */
+// Violation: ApplicationPersistenceEntity has to be be in layer dataaccess
+@MappedSuperclass
+public abstract class ApplicationPersistenceEntity implements ApplicationEntity {
+
+}
diff --git a/src/main/java/com/devonfw/sample/archunit/violation/common/ViolationItem.java b/src/main/java/com/devonfw/sample/archunit/violation/common/ViolationItem.java
new file mode 100644
index 0000000..42a2055
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/common/ViolationItem.java
@@ -0,0 +1,10 @@
+package com.devonfw.sample.archunit.violation.common;
+
+
+import com.devonfw.sample.archunit.general.common.ApplicationEntity;
+
+/**
+ * {@link ApplicationEntity} for a single task item.
+ */
+public interface ViolationItem extends ApplicationEntity {
+}
diff --git a/src/main/java/com/devonfw/sample/archunit/violation/common/ViolationRepository.java b/src/main/java/com/devonfw/sample/archunit/violation/common/ViolationRepository.java
new file mode 100644
index 0000000..505ec58
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/common/ViolationRepository.java
@@ -0,0 +1,12 @@
+package com.devonfw.sample.archunit.violation.common;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.devonfw.sample.archunit.violation.dataaccess.ViolationEntity;
+
+/**
+ * Interface for the {@link JpaRepository} giving database access to {@link ViolationEntity}.
+ */
+ // Violation: JpaRepository has to be in layer dataaccess and should be in the same package as the entity.
+public interface ViolationRepository extends JpaRepository<ViolationEntity, Long> {
+}
diff --git a/src/main/java/com/devonfw/sample/archunit/violation/common/WrongInterfaceViolationEto.java b/src/main/java/com/devonfw/sample/archunit/violation/common/WrongInterfaceViolationEto.java
new file mode 100644
index 0000000..f17ec10
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/common/WrongInterfaceViolationEto.java
@@ -0,0 +1,11 @@
+package com.devonfw.sample.archunit.violation.common;
+
+
+import com.devonfw.sample.archunit.general.common.AbstractEto;
+
+/**
+ * {@link ViolationItem} implementation as {@link AbstractEto}.
+ */
+ // Violation: ETO for entity interface shall be named «EntityName»Eto (ViolationItemEto)
+public class WrongInterfaceViolationEto extends AbstractEto implements ViolationItem {
+}
diff --git a/src/main/java/com/devonfw/sample/archunit/violation/common/WrongNameRepository.java b/src/main/java/com/devonfw/sample/archunit/violation/common/WrongNameRepository.java
new file mode 100644
index 0000000..a4c9fb1
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/common/WrongNameRepository.java
@@ -0,0 +1,14 @@
+package com.devonfw.sample.archunit.violation.common;
+
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+
+import com.devonfw.sample.archunit.violation.dataaccess.ViolationEntity;
+
+/**
+ * Interface for the {@link JpaRepository} giving database access to {@link ViolationEntity}.
+ */
+ // Violation: JpaRepository interface shall be named «EntityName»Repository (ViolationRepository)
+public interface WrongNameRepository extends JpaRepository<ViolationEntity, Long> {
+}
diff --git a/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/MapperViolation.java b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/MapperViolation.java
new file mode 100644
index 0000000..cee441d
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/MapperViolation.java
@@ -0,0 +1,11 @@
+package com.devonfw.sample.archunit.violation.dataaccess;
+
+import org.mapstruct.Mapper;
+
+/**
+ * {@link Mapper} for {@link com.devonfw.sample.archunit.task.common.TaskItem}.
+ */
+// Violation: Mapper has to be in logic layer and name has to end with Mapper.
+@Mapper(componentModel = "cdi")
+public abstract interface MapperViolation {
+}
diff --git a/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/ServiceViolation.java b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/ServiceViolation.java
new file mode 100644
index 0000000..0a61185
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/ServiceViolation.java
@@ -0,0 +1,12 @@
+package com.devonfw.sample.archunit.violation.dataaccess;
+
+import javax.ws.rs.Path;
+
+/**
+ * Rest service for task component with {@link com.devonfw.sample.archunit.task.common.TaskList} and
+ * {@link com.devonfw.sample.archunit.task.common.TaskItem}.
+ */
+ // Violation: REST-Service has to be in service layer and name has to end with "Service".
+@Path("/task")
+public class ServiceViolation {
+}
diff --git a/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/UcViolation.java b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/UcViolation.java
new file mode 100644
index 0000000..68526a1
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/UcViolation.java
@@ -0,0 +1,17 @@
+package com.devonfw.sample.archunit.violation.dataaccess;
+
+import javax.enterprise.context.ApplicationScoped;
+import javax.inject.Named;
+import javax.transaction.Transactional;
+
+import com.devonfw.sample.archunit.general.logic.AbstractUc;
+
+/**
+ * {@link AbstractUc Use-case} to save {@link com.devonfw.sample.archunit.task.common.TaskList}s.
+ */
+@ApplicationScoped
+@Named
+@Transactional
+// Violation: Use-case has to be in logic layer.
+public class UcViolation extends AbstractUc {
+}
diff --git a/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/ViolationEntity.java b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/ViolationEntity.java
new file mode 100644
index 0000000..16f8fff
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/ViolationEntity.java
@@ -0,0 +1,22 @@
+package com.devonfw.sample.archunit.violation.dataaccess;
+
+import java.time.LocalDateTime;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+import javax.persistence.Table;
+
+import com.devonfw.sample.archunit.general.dataaccess.ApplicationPersistenceEntity;
+import com.devonfw.sample.archunit.violation.common.ViolationItem;
+
+/**
+ * {@link TaskItem} implementation as {@link ApplicationPersistenceEntity}.
+ */
+@Entity
+@Table(name = "VIOLATION")
+// Violation: Entity has to be named «EntityName»Entity (ViolationItemEntity).
+public class ViolationEntity extends ApplicationPersistenceEntity implements ViolationItem {
+}
diff --git a/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/ViolationEto.java b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/ViolationEto.java
new file mode 100644
index 0000000..190138f
--- /dev/null
+++ b/src/main/java/com/devonfw/sample/archunit/violation/dataaccess/ViolationEto.java
@@ -0,0 +1,11 @@
+package com.devonfw.sample.archunit.violation.dataaccess;
+
+import com.devonfw.sample.archunit.violation.common.ViolationItem;
+import com.devonfw.sample.archunit.general.common.AbstractEto;
+
+/**
+ * {@link ViolationItem} implementation as {@link AbstractEto}.
+ */
+ // Violation: ETO has to be in common layer.
+public class ViolationEto extends AbstractEto implements ViolationItem {
+}