Consider defining a bean of type service in your configuration Spring boot

Question

I get error when I run the main class    Error   Action  Consider defining a bean of type  seconds47 service TopicService  in your configuration   Description  Field topicService in seconds47 restAPI topics required a bean of type  seconds47 service TopicService  that could not be found   TopicService interface   public interface TopicService        TopicBean findById long id        TopicBean findByName String name        void saveTopic TopicBean topicBean        void updateTopic TopicBean topicBean        void deleteTopicById long id        List lt TopicBean gt  findAllTopics          void deleteAllTopics         public boolean isTopicExist TopicBean topicBean       controller    RestController public class topics         Autowired     private TopicService topicService        RequestMapping path     new topic2   method   RequestMethod GET      public void new topic   throws Exception           System out println  new topic JAVA2              Implementation class   public class TopicServiceImplementation implements TopicService         Autowired     private TopicService topicService        Autowired     private TopicRepository topicRepository        Override     public TopicBean findById long id            throw new UnsupportedOperationException  Not supported yet       To change body of generated methods  choose Tools   Templates              Override     public TopicBean findByName String name            throw new UnsupportedOperationException  Not supported yet       To change body of generated methods  choose Tools   Templates              Override     public void saveTopic TopicBean topicBean            throw new UnsupportedOperationException  Not supported yet       To change body of generated methods  choose Tools   Templates              Override     public void updateTopic TopicBean topicBean            throw new UnsupportedOperationException  Not supported yet       To change body of generated methods  choose Tools   Templates              Override     public void deleteTopicById long id            throw new UnsupportedOperationException  Not supported yet       To change body of generated methods  choose Tools   Templates              Override     public List lt TopicBean gt  findAllTopics             throw new UnsupportedOperationException  Not supported yet       To change body of generated methods  choose Tools   Templates              Override     public void deleteAllTopics             throw new UnsupportedOperationException  Not supported yet       To change body of generated methods  choose Tools   Templates              Override     public boolean isTopicExist TopicBean topicBean            throw new UnsupportedOperationException  Not supported yet       To change body of generated methods  choose Tools   Templates            Rest of the classes are defined too  I don t know why its throwing despite declaring componentScan in main class   Main class    SpringBootApplication exclude    SecurityAutoConfiguration class     ComponentScan basePackages     seconds47     EnableJpaRepositories  seconds47 repository   public class Application        public static void main String   args            SpringApplication run Application class  args             I have my packages like this   seconds47 seconds47 beans seconds47 config seconds47 repository seconds47 restAPI seconds47 service

User · Answer

You are trying to inject a bean in itself. That's obviously not going to work.

TopicServiceImplementation implements TopicService. That class attempts to autowire (by field!) a `TopicService. So you're essentially asking the context to inject itself.

It looks like you've edited the content of the error message: Field topicService in seconds47.restAPI.topics is not a class. Please be careful if you need to hide sensitive information as it makes it much harder for others to help you.

Back on the actual issue, it looks like injecting TopicService in itself is a glitch on your side.

User · Answer

remove annotation configuration like service  repository  components  Component  Service

User · Answer

I fixed the problem adding this line  ComponentScan basePackages     com example DemoApplication    to main class file  just up from the class name   x000D   x000D  package com example demo  x000D   x000D  import org springframework boot SpringApplication  x000D  import org springframework boot autoconfigure SpringBootApplication  x000D  import org springframework context annotation ComponentScan  x000D   x000D   SpringBootApplication x000D   ComponentScan basePackages     com example DemoApplication    x000D  public class DemoApplication   x000D   x000D   public static void main String   args    x000D    SpringApplication run DemoApplication class  args   x000D     x000D   x000D    x000D   x000D   x000D

User · Answer

Even after doing all the method suggested  i was getting the same error  After trying  hard  i got to know that hibernate s maven dependency was added in my pom xml  as i removed it  application started successfully   I removed this dependency    lt dependency gt   lt groupId gt org hibernate javax persistence lt  groupId gt    lt artifactId gt hibernate-jpa-2 0-api lt  artifactId gt                lt version gt 1 0 1 Final lt  version gt            lt  dependency gt

User · Answer

I solved this issue by creating a bean for my service in SpringConfig java file  Please check the below code    Configuration  public class SpringConfig      Bean public TransactionService transactionService         return new TransactionServiceImpl           The path of this file is shown in the below image  Spring boot application folder structure

User · Answer

SpringBootApplication  ComponentScan basePackages     io testapi     In the main class below springbootapplication annotation i have written componentscan and it worked for me

User · Answer

A class must have the  Component annotation or a derivation of that  like  Service   Repository etc   to be recognized as a Spring bean by the component scanning  So if you add  Component to the class  it should solve your problem

User · Answer

In case you were wondering where to add  Service annotation  then make sure you have added  Service annotation to the class that implements the interface  That would solve this problem

User · Answer

Consider defining a bean of type        moviecruser repository MovieRepository  in your        configuration      This type of issue will generate if you did not add     correct dependency  Its the same issue I faced but after I found my JPA     dependency is not working correctly  so make sure that first     dependency is correct or not   For example -  The  dependency I used        lt dependency gt          lt groupId gt org springframework data lt  groupId gt                lt artifactId gt spring-data-jpa lt  artifactId gt       lt  dependency gt    Description  got this exception  -     Parameter 0 of constructor in        moviecruser serviceImple MovieServiceImpl required a bean of        type  moviecruser repository MovieRepository  that could not         be found    Action   After change dependency -       lt  --       lt dependency gt          lt groupId gt org springframework boot lt  groupId gt           lt artifactId gt spring-boot-starter-data-jpa lt  artifactId gt       lt  dependency gt    Response -     2019-09-06 23 08 23 202  INFO 7780 -           main moviecruser MovieCruserApplication  Started           MovieCruserApplication in 10 585 seconds  JVM running for         11 357

User · Answer

I resolved by replacing the corrupted jar files    But to find those corrupted jar files  I have to run my application in three IDE- 1  Intellij Idea 2 NetBeans 3  Eclipse    Netbeans given me information for maximum number of corrupted jar  In Netbeans along with the run  I use the build option after right clicking on project  to know more about corrupted jars    It took me more than 15 hours to find out the root cause for these errors  Hope it help anyone

User · Answer

Since TopicService is a Service class  you should annotate it with  Service  so that Spring autowires this bean for you  Like so    Service public class TopicServiceImplementation implements TopicService               This will solve your problem

User · Answer

You have to update your   scanBasePackages      com exm java      to add the path to your service  after annotating it with  service

User · Answer

Please make sure that you have added the dependency in pom xml or gradle file  spring-boot-starter-data-jpa

[java] Consider defining a bean of type 'service' in your configuration [Spring boot]

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