Spring Data: Not an managed type: class java.lang.Object

Question

I am trying to expose my db tables via spring boot by following different spring tutorials and I am running into following exception (I will post exception at the end).

Here are the classes that I am using

package com.xxx.xxx.db;

import org.springframework.data.repository.Repository;

import java.io.Serializable;

public interface BaseRepository<T, ID extends Serializable> extends Repository<T, ID>{
  T findOne(ID id);
  T save(T entity);
}

And here is my specific service class

package com.xxx.xxx.tablename;

import com.xxx.xxx.db.BaseRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class TableNameService {

  @Autowired
  private BaseRepository<TableName, Long> repository;

  public TableName findById(Long id){
    return repository.findOne(id);
  }
}

and here is my entity

package com.xxx.xxx.tablename;

import lombok.Getter;
import lombok.Setter;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;

@Getter
@Setter
@Entity
@Table(name="table_name")
public class TableName {

  @Id
  private long id;

  @NotNull
  private String name;

  public TableName() {
  }

  public TableName(long id){
    this.id = id;
  }

  public TableName(String name){
    this.name = name;
  }

  public TableName(long id, String name){
    this.id = id;
    this.name = name;
  }
}

My spring configurations are being done by application.yml file. The file currently have only database connection informaiton and nothing more than that

I also have a class named BeansConfig which is annotated by @Configuration. But this class is being used to validate if db properties which are being provided by application.yml are valid.

And now here is the exception

springframework.beans.factory.BeanCreationException: Error creating bean with name 'TableNameService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.xxx.xxx.db.BaseRepository com.xxx.xxx.tablename.TableNameService.repository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'baseRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766)
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180)
    at com.xxx.xxx.Application.main(Application.java:12)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.xxx.xxx.db.BaseRepository com.xxx.xxx.tablename.TableNameService.repository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'baseRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 17 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'baseRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1199)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1116)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545)
    ... 19 common frames omitted
Caused by: java.lang.IllegalArgumentException: Not an managed type: class java.lang.Object
    at org.hibernate.jpa.internal.metamodel.MetamodelImpl.managedType(MetamodelImpl.java:219)
    at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:68)
    at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getEntityInformation(JpaEntityInformationSupport.java:67)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:152)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:99)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:81)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:185)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:251)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:237)
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:92)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
    ... 29 common frames omitted

You can use already available repository interfaces of Spring Data - for example JpaRepository. Try creating a specific interface for your Table class - something like "TableRepository extends JpaRepository<Table, Long>" and annotate it with @Repository annotation. — lenach87
– lenach87, Commented May 9, 2016 at 20:19
If you get this error trying to implement repository hierarchy, put @NoRepositoryBean annotation on your custom parent repository interface. — chill appreciator
– chill appreciator, Commented Feb 21, 2022 at 10:05

Community · Accepted Answer · 2017-05-23 12:07:53Z

19

That's not possible the way you are trying. Since T needs to be an Entity, you need to type-restrict it. One option would be to make one repository per concrete Entity, but here you have a more generic way of implementing it:

Use a BaseClass for your entities:

@Entity
public abstract class BaseClass<IdType extends Serializable>{

    private IdType id;

    //Getter and setters

}

Define a @Repository for your base class:

@Repository
public interface Dao<T extends BaseClass, IdType extends Serializable> extends
        CrudRepository<T, IdType> {

}

You can define the shared entity operations in this interface and inherit from them for more concrete ones in the cases demanding it.

See also:

How to implement a Spring Data repository for a @MappedSuperclass

edited May 23, 2017 at 12:07

CommunityBot

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answered May 9, 2016 at 20:30

Aritz

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2 Comments

Em Ae Over a year ago

Thats something I would love to implement but for now, i am struggling to write a repo for specific class. I added a class TableNameGatewayRepo<TableName, ID extends Serializable> extends JpaRepoistory<PaymentGateway, ID> and I am still getting same error

Aritz Over a year ago

Try TableNameGatewayRepo extends CrudRepository<PaymentGateway, Long> or the same way with Jpa instead of Crud

sebastian89n · Accepted Answer · 2023-10-15 07:35:37Z

5

It's an old post, but I encoutered the same problem so let me share the current solution.

There's a new annotation @NoRepositoryBean to handle this case. It can be added on interfaces that extends Repository, but it instructs context not to initialize it as actual Spring Data JPA Repository.

https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/repository/NoRepositoryBean.html

You just need to annotate your custom repository with this annotation and later extend it for actual JPA repositories.

answered Oct 15, 2023 at 7:35

sebastian89n

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1 Comment

Yusuph wickama Jan 8 at 21:35

Logged in just to upvote!

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