java.lang.IllegalStateException: org.hibernate.TransientObjectException: object references an unsaved transient instance

 Hello All,

Today I'm sharing my learning experience, to solve the one issue while working with Springboot & Hibernate/JPA.

We often get the below error.

org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.oracle.dto.Asset
	at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:347) ~[hibernate-core-5.6.10.Final.jar:5.6.10.Final]

The solution of this issue is to explicitly save the referred data.

I've solved this issue with the below code.

Transaction tx=session.beginTransaction();
        session.save(citizen);
        for (Asset asset:citizen.getAssetList()) {
            session.save(asset);
        }
        tx.commit();

SpringBoot disable all default database related configuration.

 Hi Folks,

Today, I'm sharing my working experience to disable the default springboot database related configuration.

This can be achieved via two mechanism.

Mechanism 1: Annotations

@SpringBootApplication
@EnableAutoConfiguration(exclude = {
    DataSourceAutoConfiguration.class,
    DataSourceTransactionManagerAutoConfiguration.class,
    HibernateJpaAutoConfiguration.class})
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

Mechanism 2 : application.properties.

spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration, org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration