Add a reproducer for spring-projects/spring-framework#31050

The related error happen with Hibernate 6.2 with
custom find methods on non-transactional use cases.

See gh-188

data/data-jpa/src/appTest/java/com/example/data/jpa/DataJpaApplicationAotTests.java

@@ -96,4 +96,16 @@ void abstractPersistable(AssertableOutput output) {
 		});
 	}
 
+	@Test
+	void listVouchers(AssertableOutput output) {
+		Awaitility.await().atMost(Duration.ofSeconds(10)).untilAsserted(() -> {
+			assertThat(output)
+				.hasSingleLineContaining(
+						"listVouchers(): voucher = Voucher{id=1, msisdn='0810000000', status=0, dateCreated")
+				.hasSingleLineContaining(
+						"listVouchers(): voucher = Voucher{id=2, msisdn='0810000000', status=1, dateCreated=");
+
+		});
+	}
+
 }

data/data-jpa/src/main/java/com/example/data/jpa/NonTransactionalRunner.java

@@ -0,0 +1,35 @@
+package com.example.data.jpa;
+
+import java.util.List;
+
+import com.example.data.jpa.model.Voucher;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+public class NonTransactionalRunner implements CommandLineRunner {
+
+	private final VoucherRepository voucherRepository;
+
+	public NonTransactionalRunner(VoucherRepository voucherRepository) {
+		this.voucherRepository = voucherRepository;
+	}
+
+	@Override
+	public void run(String... args) {
+		insertVouchers();
+		listVouchers();
+	}
+
+	private void insertVouchers() {
+		this.voucherRepository.save(new Voucher("0810000000", 0));
+		this.voucherRepository.save(new Voucher("0810000000", 1));
+	}
+
+	private void listVouchers() {
+		List<Voucher> vouchers = this.voucherRepository.findByMsisdn("0810000000");
+		vouchers.forEach(voucher -> System.out.printf("listVouchers(): voucher = %s%n", voucher));
+	}
+
+}

data/data-jpa/src/main/java/com/example/data/jpa/CLR.java → data/data-jpa/src/main/java/com/example/data/jpa/TransactionalRunner.java

@@ -15,15 +15,16 @@
 import org.springframework.transaction.annotation.Transactional;
 
 @Component
-class CLR implements CommandLineRunner {
+class TransactionalRunner implements CommandLineRunner {
 
 	private final AuthorRepository authorRepository;
 
 	private final BookRepository bookRepository;
 
 	private final PublisherRepository publisherRepository;
 
-	CLR(AuthorRepository authorRepository, BookRepository bookRepository, PublisherRepository publisherRepository) {
+	TransactionalRunner(AuthorRepository authorRepository, BookRepository bookRepository,
+			PublisherRepository publisherRepository) {
 		this.authorRepository = authorRepository;
 		this.bookRepository = bookRepository;
 		this.publisherRepository = publisherRepository;

data/data-jpa/src/main/java/com/example/data/jpa/VoucherRepository.java

@@ -0,0 +1,13 @@
+package com.example.data.jpa;
+
+import java.util.List;
+
+import com.example.data.jpa.model.Voucher;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface VoucherRepository extends CrudRepository<Voucher, Integer> {
+
+	List<Voucher> findByMsisdn(String msisdn);
+
+}

data/data-jpa/src/main/java/com/example/data/jpa/model/Voucher.java

@@ -0,0 +1,87 @@
+package com.example.data.jpa.model;
+
+import java.util.Date;
+import java.util.Objects;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+
+@Entity
+public class Voucher {
+
+	@Id
+	@GeneratedValue
+	private Integer id;
+
+	private String msisdn;
+
+	private int status;
+
+	private Date dateCreated;
+
+	protected Voucher() {
+	}
+
+	public Voucher(String msisdn, int status) {
+		this.id = null;
+		this.msisdn = msisdn;
+		this.status = status;
+		this.dateCreated = new Date();
+	}
+
+	public Integer getId() {
+		return id;
+	}
+
+	public void setId(Integer id) {
+		this.id = id;
+	}
+
+	public String getMsisdn() {
+		return msisdn;
+	}
+
+	public void setMsisdn(String msisdn) {
+		this.msisdn = msisdn;
+	}
+
+	public int getStatus() {
+		return status;
+	}
+
+	public void setStatus(int status) {
+		this.status = status;
+	}
+
+	public Date getDateCreated() {
+		return dateCreated;
+	}
+
+	public void setDateCreated(Date dateCreated) {
+		this.dateCreated = dateCreated;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o)
+			return true;
+		if (o == null || getClass() != o.getClass())
+			return false;
+		Voucher voucher = (Voucher) o;
+		return status == voucher.status && Objects.equals(id, voucher.id) && Objects.equals(msisdn, voucher.msisdn)
+				&& Objects.equals(dateCreated, voucher.dateCreated);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(id, msisdn, status, dateCreated);
+	}
+
+	@Override
+	public String toString() {
+		return "Voucher{" + "id=" + id + ", msisdn='" + msisdn + '\'' + ", status=" + status + ", dateCreated="
+				+ dateCreated + '}';
+	}
+
+}