Error creating bean with name 'entityManagerFactory' defined in class path resource : Invocation of init method failed

When I compile my spring project, I got the following error.

> Error creating bean with name 'entityManagerFactory' defined in class > path resource > [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: > Invocation of init method failed

I am using STS Eclipse and MySql Database

My Connection string in Application.Properties is

spring.datasource.url=jdbc:mysql://localhost:3306/stgdb
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.hibernate.ddl-auto=update

The detailed error is given below

=================================================

2016-10-15 15:34:38.875[0;39m [31mERROR[0;39m [35m3700[0;39m [2m---[0;39m [2m[           main][0;39m [36mo.s.boot.SpringApplication              [0;39m [2m:[0;39m Application startup failedorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1583) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1076) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:851) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
	at com.s2g.testrestapplication.TestRestApplication.main(TestRestApplication.java:10) [classes/:na]
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:954) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:882) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final]
	at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60) ~[spring-orm-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353) ~[spring-orm-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:373) ~[spring-orm-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:362) ~[spring-orm-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1642) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	... 16 common frames omitted
Caused by: org.hibernate.exception.GenericJDBCException: Unable to obtain JDBC Connection
	at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:95) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.schema.extract.internal.ExtractionContextImpl.getJdbcConnection(ExtractionContextImpl.java:65) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.schema.extract.internal.ExtractionContextImpl.getJdbcDatabaseMetaData(ExtractionContextImpl.java:75) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl.locateTableInNamespace(InformationExtractorJdbcDatabaseMetaDataImpl.java:339) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl.getTable(InformationExtractorJdbcDatabaseMetaDataImpl.java:241) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.schema.extract.internal.DatabaseInformationImpl.getTableInformation(DatabaseInformationImpl.java:105) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigrationToTargets(SchemaMigratorImpl.java:162) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:60) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:134) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:101) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:472) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:444) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:879) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final]
	... 22 common frames omitted
Caused by: com.atomikos.jdbc.AtomikosSQLException: Connection pool exhausted - try increasing 'maxPoolSize' and/or 'borrowConnectionTimeout' on the DataSourceBean.
	at com.atomikos.jdbc.AtomikosSQLException.throwAtomikosSQLException(AtomikosSQLException.java:46) ~[transactions-jdbc-3.9.3.jar:na]
	at com.atomikos.jdbc.AbstractDataSourceBean.throwAtomikosSQLException(AbstractDataSourceBean.java:90) ~[transactions-jdbc-3.9.3.jar:na]
	at com.atomikos.jdbc.AbstractDataSourceBean.throwAtomikosSQLException(AbstractDataSourceBean.java:85) ~[transactions-jdbc-3.9.3.jar:na]
	at com.atomikos.jdbc.AbstractDataSourceBean.getConnection(AbstractDataSourceBean.java:347) ~[transactions-jdbc-3.9.3.jar:na]
	at com.atomikos.jdbc.AbstractDataSourceBean.getConnection(AbstractDataSourceBean.java:394) ~[transactions-jdbc-3.9.3.jar:na]
	at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:180) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	at org.hibernate.tool.schema.extract.internal.ExtractionContextImpl.getJdbcConnection(ExtractionContextImpl.java:62) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
	... 33 common frames omitted
==============================
Pom.xml file

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.s2g.testrestapplication</groupId>
	<artifactId>testrestapplication</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>TestRestApplication</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.4.1.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger2</artifactId>
			<version>2.2.2</version>
		</dependency>

		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger-ui</artifactId>
			<version>2.2.2</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-security</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.opensaml</groupId>
			<artifactId>opensaml-saml-api</artifactId>
			<version>3.1.1</version>
		</dependency>
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
			<version>3.0</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jersey</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jta-atomikos</artifactId>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

I would start by adding the following dependency:

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>4.1.4.Final</version>
</dependency>

and

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>5.2.3.Final</version>
</dependency>

UPDATE: Or simply add the following dependency.

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.0</version>
</dependency>

People using Java 9 include this dependency:

<dependency>
	<groupId>javax.xml.bind</groupId>
	<artifactId>jaxb-api</artifactId>
	<version>2.3.0</version>
</dependency>

Adding dependencies didn't fix the issue at my end.

The issue was happening at my end because of "additional" fields that are part of the "@Entity" class and don't exist in the database.

I removed the additional fields from the @Entity class and it worked.

Goodluck.

I've jdk-12.0.2.jdk, 've found solution to the problem, add dependencies to pom.xml:

<!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.javassist/javassist -->
<dependency>
    <groupId>org.javassist</groupId>
    <artifactId>javassist</artifactId>
    <version>3.25.0-GA</version>
</dependency>

I suspect that the jar files of hibernate-core and hibernate-entitymanager dependencies are corrupted or were not installed properly on your machine.

I suggest that you just delete the folders named hibernate-core and hibernate-entitymanager from your Maven local repository and Maven will reinstall them.

The default location for Maven local repository is C:\Documents and Settings\[USERNAME]\.m2 in windows or ~/.m2 in Linux/Mac.

In my case, deleting any of the below annotations cause the error message 'entityManagerFactory' to show, for example.

 @Id
  @GeneratedValue(strategy=GenerationType.AUTO)

or

@ManyToMany(targetEntity=listOfObject_x.class)

The error message disappears after adding the missing annotation(s).

package mypackage_unameit;
import javax.persistence.PrePersist;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

import lombok.Data;

@Data
@Entity
public class Someclasss {

  @Id
  @GeneratedValue(strategy=GenerationType.AUTO)
  private Long id;

  @NotNull
  @Size(min=5, message="Name must be at least 5 characters long")
  private String name;

  private Date createdAt;

  @ManyToMany(targetEntity=listOfObject_x.class)
  @Size(min=1, message="You must choose at least 1 ingredient")
  private List<listOfObject_x>   = new ArrayList<>();

  @PrePersist
  void createdAt() {
    this.createdAt = new Date();
  }
}

I solved mine by updating spring dependencies versions from 2.0.4 to 2.1.6

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.4.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
</parent>

to

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.6.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
</parent>

For those who are not using JPA and instead prefer to exclude the entityManagerFactory and use Spring Data JDBC or Spring JDBC can exclude the bean to avoid the exception

@SpringBootApplication(exclude = {HibernateJpaAutoConfiguration.class})

For those who use Gradle instead of Maven, add this to the dependencies in your build file:

compile('javax.xml.bind:jaxb-api:2.3.0')

For my case it was due to Intellij IDEA by default set Java 11 as default project SDK, but project was implemented in Java 8. I've changed "Project SDK" in File -> Project Structure -> Project (in Project Settings)

When we map a column, we have to pay attention to the name of the opposite column that is being mapped, for example:

/*users*/
@OneToMany(mappedBy = "partModel")
private List<UsersModel> usersModels;


/*parts*/
@ManyToOne
private PartModel partModel;

Check out postModel here.***

I was able to fix the problem by changing the maximum-pool size value from one to two

spring.datasource.hikari.maximum-pool-size=2

Try to annotate the class with @EnableTransactionManagement. I was facing the same issue and it got resolved by adding this.

@EnableTransactionManagement
public class ConfigurationBean {
}

If you use JDK 1.8.0_201 or latest try it with older JDK.

I have same issue with JDK1.8.0_201, however it works with JDK1.8.0_101 without any code change.

I resolved this issue by Adding implements Serializable in the Model.

@Entity
@Table(name="Model_Rest")
@IdClass(Model_Rest.class)
public class Model_Rest implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	/**
	 * 
	 */
	//@GeneratedValue(strategy = GenerationType.AUTO)
	//@Column(columnDefinition="id")
	
	@Id
	private String login;
	@Id
	private String password;

	
	

	@Autowired
	public String getLogin() {
		return login;
	}
	
	@Autowired
	public void setLogin(String login) {
		this.login = login;
	}

	@Autowired
	public String getPassword() {
		return password;
	}

	@Autowired
	public void setPassword(String password) {
		this.password = password;
	}

	public Model_Rest() {
		// TODO Auto-generated constructor stub
	}

	public Model_Rest(String login, String password) {
		this.login = login;
		this.password = password;
	}

	@Override
	public String toString() {
		return "Model_Rest [login=" + login + ", password=" + password + "]";
	}
  }

This error may be also related to the fact that you have an error in your "spring.datasource.url" when you gave a wrong db name for example

For me, it was a result of another error

> org.postgresql.util.PSQLException: FATAL: password authentication failed for user

Which means you just need to review your authentication credentials

I had the same issue on my Eclipse Luna. I figure out that I am using JDK12 and Java 1.8. I changed JDK to JDK8 and the problem was solved. If you want to check your JDK in Eclipse go to

Window-> Preferences-> Java- >Installed JREs 

and check if they are compatible with your project. Good luck!

For me it was the name of the database on application.properties. When I provided the correct name it worked ok.

Whoever still having the same issue. Please add the following line in application.properties

# The SQL dialect makes Hibernate generate better SQL for the chosen database
## I am using Mysql8 so I have declared MySQL8Dialect if you have other versions just add ## that version number
spring.jpa.properties.hibernate.dialect =  org.hibernate.dialect.MySQL8Dialect

In my case the issue was multiparted and related to AWS:

1. as @Tareq Islam pointed out setting the dialect in application.properties helped. I used for MySQL 5.6:

   spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL55Dialect

2. the second issue after this was that the JDBC was not able to connect to the server due to change in SSL connection encryption. I fixed it with help of

https://stackoverflow.com/questions/38205947/sslhandshakeexception-no-appropriate-protocol

But I needed to enable TLS1.0 by setting to /etc/java-11-openjdk/security/java.security

jdk.tls.disabledAlgorithms=SSLv3, RC4, DES, MD5withRSA, DH keySize < 1024, EC keySize < 224, 3DES_EDE_CBC, anon, NULL

In my case i add the following line in application.properties ,the issue was in Oracle 11g DB Driver

spring.jpa.database-platform=org.hibernate.dialect.OracleDialect

Adding dependencies didn't fix the issue at my end as well.

The issue was happening at my end because database myapplication in spring.datasource.url=jdbc:mysql://localhost:3306/myapplication didn't exist in mysql.

I created the db manually, restarted the application and it worked.

use @Id .Worked for me.Otherwise it i will throw error.It depends on is there anything missing in your entity class or repository

My error was solved after adding this dependency.

<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
    <dependency>
        <groupId>org.hibernate.validator</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>6.0.16.Final</version>
    </dependency>

Try changing spring version. I had the same issue and that worked for me

I resolved mine by defining reverse-relationship annotation for an additional field

In my case I got this error when trying to make Proguard + Spring Boot 2 work.

Adding -dontusemixedcaseclassnames to proguard.conf fixes it.

In our case, we had some extra lines in the .properties file which was not needed with the new image.

spring.jpa.properties.hibernate.cache.use_second_level_cache=true

Obviously with didn't had that Entity what it tried to load.

If nothing work then I have one solution @Access(value=AccessType.FIELD) add this line in under model class after you used @Entity then followed by the class and after class when you defining id and all that time you use above line.

In my case, I have set ddl-auto as validate, in application.properties file

spring.jpa.hibernate.ddl-auto=validate

Here, the issue occurs when property hibernate.hbm2ddl.auto is set to validate. Everything works fine when it is set to none. I think validator doesn't take into account that when primary key is defined as GENERATED BY DEFAULT AS IDENTITY.

Make sure you have successfully build dependent maven/gradle based project with the correct mention version. Similarly you can add the dependent project in config like below.

        @Bean
    	@Primary
    	public LocalContainerEntityManagerFactoryBean entityManager() {
    		EntityManagerFactoryBuilder builder = new 
            EntityManagerFactoryBuilder(adapter, jpaProperties.getProperties(),
    		    persistenceUnitManager);
    		return builder
    		    .dataSource(dataSources()).packages("com.ABCApi.entity",
    		        "com.PQRApi.entity", "com.XYZApi.entity")
    		    .persistenceUnit("entityManager").build();
    	}

I had the same problem, already after I finished the project, and did not understand what happened, because no change was made to the code. I realized that there were probably two processes running, I stopped the process I did not need and the second process I ran, and it solved my problem of not syncing to DB.

The 2 processes I had:

In my case, I have mistakenly configured relations in my model class

Please check your relations (oneToOne, oneToMany ...) in your model. It might be the issue.

I have gone through similar error. The error was not coming earlier, but recently I reinstall my oracle db and change the instance name from 'xe' to 'orcl', but forget to change this piece of code in property file:

spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver
spring.datasource.url=jdbc:oracle:thin:@localhost:1521:***xe***
spring.datasource.username=system
spring.datasource.password=manager

Once I change it from 'xe' to 'orcl' everything is fine.

The problem might be because of package conflicts. When you use @Id annotation in an entity, it might use the @Id of Spring framework; however, it must use @Id annotation of persistence API.

So use @javax.persistence.Id annotation in entities.

Try adding the following dependencies.

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
   <groupId>com.h2database</groupId>
   <artifactId>h2</artifactId>
</dependency>