Warning Message:
When working with Spring Boot, you might encounter the following warning message: Consider defining a bean named 'entityManagerFactory' in your configuration
.
This warning suggests that an entity manager factory bean is not defined in your application configuration.
To resolve this warning, you can take the following steps:
- Define an entity manager factory bean in your Spring Boot configuration. You can do this by creating a method annotated with
@Bean
that returns anEntityManagerFactory
instance. - If you're using JPA, make sure you have configured the necessary properties for the entity manager factory, such as data source configuration and JPA vendor properties.
- Ensure that your application's configuration is properly scanned by Spring Boot and that the bean definition is picked up during application startup.
- If you're using Spring Boot auto-configuration, make sure that your application dependencies and configurations are compatible with the default auto-configuration provided by Spring Boot.
- After defining the entity manager factory bean, restart your Spring Boot application to apply the changes and verify that the warning message no longer appears.
I encountered the exact same issue. Upon checking the Maven build log, I discovered an error related to hibernate packages, specifically complaining about "invalid LOC header (bad signature)." To resolve this, I deleted the subdirectories under .m2\repository\org\hibernate\hibernate-core
and then recompiled my project.
In my case, the issue stemmed from missing the Hibernate Entity Manager dependency:
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.2.3.Final</version>
</dependency>
Initially, I only had the Hibernate Core dependency:
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.1.4.Final</version>
</dependency>
To further resolve the issue, I added the following dependency:
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>
In Spring Boot, there's no need to annotate your repository class with @Repository
. Simply extend JpaRepository
on your interface, and Spring Boot will handle the rest. For example:
public interface YourRepository extends JpaRepository<YourDomain, Serializable> {
YourDomain findBySomeParameter(Long parameter);
}
You also don't need to add these annotations:
@EnableJpaRepositories
@EntityScan
@ComponentScan
Spring Boot handles these automatically, unless you're performing custom configuration.
I encountered a similar issue when I started learning Spring Boot a few months ago. I'm not sure if Spring takes directory structure seriously. My directory structure was similar to @Pawan's. The solution was to move the repository folder one level up, i.e., into the parent "abc" folder. Then, annotate your DeviceDao class with @Service
. Finally, update the repository path in @EnableJpaRepository
. This approach worked for me. I hope this helps!
The issue I encountered was related to the properties file. For some reason, I had included this line (although I can't recall why):
spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration
I simply commented out this line, and the problem was resolved.
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