BAEL-3849 Implemented example code for comparing Transactional. (#9261)

persistence-modules/spring-boot-persistence-2/src/main/java/com/baeldung/spring/transactional/TransactionalCompareApplication.java

@@ -0,0 +1,12 @@
+package com.baeldung.spring.transactional;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+class TransactionalCompareApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(TransactionalCompareApplication.class, args);
+    }
+}

persistence-modules/spring-boot-persistence-2/src/main/java/com/baeldung/spring/transactional/entity/Car.java

@@ -0,0 +1,60 @@
+package com.baeldung.spring.transactional.entity;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Car {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String make;
+
+    private String model;
+
+    public Car() {
+    }
+
+    public Car(Long id, String make, String model) {
+        this.id = id;
+        this.make = make;
+        this.model = model;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getMake() {
+        return make;
+    }
+
+    public void setMake(String make) {
+        this.make = make;
+    }
+
+    public String getModel() {
+        return model;
+    }
+
+    public void setModel(String model) {
+        this.model = model;
+    }
+
+    @Override
+    public String toString() {
+        return "Car{" +
+                "id=" + id +
+                ", make='" + make + '\'' +
+                ", model='" + model + '\'' +
+                '}';
+    }
+}

persistence-modules/spring-boot-persistence-2/src/main/java/com/baeldung/spring/transactional/repository/CarRepository.java

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+package com.baeldung.spring.transactional.repository;
+
+import com.baeldung.spring.transactional.entity.Car;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CarRepository extends JpaRepository<Car, Long> {
+}

persistence-modules/spring-boot-persistence-2/src/main/java/com/baeldung/spring/transactional/service/CarService.java

@@ -0,0 +1,25 @@
+package com.baeldung.spring.transactional.service;
+
+import com.baeldung.spring.transactional.entity.Car;
+import com.baeldung.spring.transactional.repository.CarRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Isolation;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+
+import javax.persistence.EntityExistsException;
+
+@Service
+@Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.SUPPORTS, readOnly = false, timeout = 30)
+public class CarService {
+
+    @Autowired
+    private CarRepository carRepository;
+
+    @Transactional(rollbackFor = IllegalArgumentException.class, noRollbackFor = EntityExistsException.class,
+      rollbackForClassName = "IllegalArgumentException", noRollbackForClassName = "EntityExistsException")
+    public Car save(Car car) {
+        return carRepository.save(car);
+    }
+}

persistence-modules/spring-boot-persistence-2/src/main/java/com/baeldung/spring/transactional/service/RentalService.java

@@ -0,0 +1,22 @@
+package com.baeldung.spring.transactional.service;
+
+import com.baeldung.spring.transactional.entity.Car;
+import com.baeldung.spring.transactional.repository.CarRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import javax.persistence.EntityExistsException;
+import javax.transaction.Transactional;
+
+@Service
+@Transactional(Transactional.TxType.SUPPORTS)
+public class RentalService {
+
+    @Autowired
+    private CarRepository carRepository;
+
+    @Transactional(rollbackOn = IllegalArgumentException.class, dontRollbackOn = EntityExistsException.class)
+    public Car rent(Car car) {
+        return carRepository.save(car);
+    }
+}