title: Spring data JDBC cannot create repository Bean - "entity is marked @NonNull but is null"
body: <p>I am just beginning to explore spring data JDBC. I have a simple db (postgres) with a questionnaires table that I am trying to query:</p>
  
  <pre><code>CREATE TABLE IF NOT EXISTS foster.questionnaires (
      questionnaire_id SERIAL PRIMARY KEY,
      version varchar(10),
      name text,
      title text,
      description text,
      status questionnaire_status_types
  );
  </code></pre>
  
  <p>And Java classes: </p>
  
  <p>(config inspired from <a href="https://spring.io/blog/2018/09/17/introducing-spring-data-jdbc" rel="nofollow noreferrer">here</a>)</p>
  
  <pre><code>@SpringBootApplication(scanBasePackages= {"com.app.foster"})
  @EnableJdbcRepositories("com.app.foster.dal.repositories")
  public class FosterApplication extends JdbcConfiguration {
  
      // Config
      @Bean
      NamedParameterJdbcOperations operations() {
          return new NamedParameterJdbcTemplate(dataSource());
      }
  
      @Bean
      PlatformTransactionManager transactionManager() {
          return new DataSourceTransactionManager(dataSource());
      }
  
      @Value("${spring.datasource.url}")
      private String url;
  
      @Bean
      @ConfigurationProperties("spring.datasource")
      public HikariDataSource dataSource() {
          //User name and password is fetched from some other data storage
  
          HikariConfig hikariConfig = new HikariConfig();
          hikariConfig.setJdbcUrl(url);
          hikariConfig.setUsername("postgres"); //TODO: abstract these
          hikariConfig.setPassword("password");
  
          //The data source created here doesn't have connection timeout value
          //set by me
          return new HikariDataSource(hikariConfig);
      }
  
      @Bean
      public ApplicationListener&lt;?&gt; loggingListener() {
  
          return (ApplicationListener&lt;ApplicationEvent&gt;) event -&gt; {
              if (event instanceof RelationalEvent) {
                  System.out.println("Received an event: " + event);
              }
           };
      }
  
      public static void main(String[] args) {
          SpringApplication.run(FosterApplication.class, args);
      }
  
   }
  </code></pre>
  
  <p>(Entity)</p>
  
  <pre><code>@Entity
  @Table(name="questionnaires")
  public class Questionnaire {
    @Id
    Long questionnaire_id;
  
    String version;
  
    String name;
  
    String title;
  
    String description;
  
    enum Status { DRAFT, PUBLISHED }
    Status status;
  
      public Questionnaire(Long questionnaire_id, String version, String name, String title, String description, Status status) {
          this.questionnaire_id = questionnaire_id;
          this.version = version;
          this.name = name;
          this.title = title;
          this.description = description;
          this.status = status;
      }
  
       // Getters and Setters
      public Long getQuestionnaire_id()   {
           return this.questionnaire_id;
      }
  
      public void setQuestionnaire_id(Long questionnaire_id)  {
           this.questionnaire_id = questionnaire_id;
      }
  
      public String getVersion()  {
          return this.version;
      }
  
      public void setVersion(String version)  {
          this.version = version;
      }
  
      public String getName() {
          return this.name;
      }
  
      public void setName(String name)    {
          this.name = name;
      }
  
      public String getTitle()    {
          return this.title;
      }
  
      public void setTitle(String title)  {
          this.title = title;
      }
  
      public String getDescription()  {
          return this.description;
      }
  
      public void setDescription(String description)  {
          this.description = description;
      }
  
      public Status getStatus()   {
          return this.status;
      }
  
      public void setStatus(Status status)    {
          this.status = status;
    }
  
  }
  </code></pre>
  
  <p>(Repository):</p>
  
  <pre><code>public interface IQuestionnairesRepository&lt;Questionnaire, Long&gt; extends CrudRepository&lt;Questionnaire, Long&gt; {
  
      @Query("select * from questionnaires where title = :title")
      List&lt;Questionnaire&gt; findByTitle(@Param("title") String title);
  
  }
  </code></pre>
  
  <p>However when starting the application, I cannot create the bean for the repository with the following error and cannot figure out what I am doing wrong in instantiating this repository: </p>
  
  <pre><code>org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloWorldController': Unsatisfied dependency expressed through field 'questionnairesRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'IQuestionnairesRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: entity is marked @NonNull but is null
  at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1395) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
  at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
  at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE]
  at com.optum.foster.FosterApplication.main(FosterApplication.java:65) [classes/:na]
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
  at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
  at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.1.3.RELEASE.jar:2.1.3.RELEASE]
      Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'IQuestionnairesRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: entity is marked @NonNull but is null
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1762) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1247) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  ... 24 common frames omitted
      Caused by: java.lang.IllegalArgumentException: entity is marked @NonNull but is null
  at org.springframework.data.jdbc.repository.support.SimpleJdbcRepository.&lt;init&gt;(SimpleJdbcRepository.java:33) ~[spring-data-jdbc-1.0.5.RELEASE.jar:1.0.5.RELEASE]
  at org.springframework.data.jdbc.repository.support.JdbcRepositoryFactory.getTargetRepository(JdbcRepositoryFactory.java:109) ~[spring-data-jdbc-1.0.5.RELEASE.jar:1.0.5.RELEASE]
  at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:305) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
  at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:297) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
  at org.springframework.data.util.Lazy.getNullable(Lazy.java:211) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
  at org.springframework.data.util.Lazy.get(Lazy.java:94) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
  at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:300) ~[spring-data-commons-2.1.5.RELEASE.jar:2.1.5.RELEASE]
  at org.springframework.data.jdbc.repository.support.JdbcRepositoryFactoryBean.afterPropertiesSet(JdbcRepositoryFactoryBean.java:144) ~[spring-data-jdbc-1.0.5.RELEASE.jar:1.0.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1821) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1758) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
  ... 34 common frames omitted
  </code></pre>
  
  <p>Any help would be appreciated - spring data jdbc looks promising; however, without the ability to instantiate a repository I am blocked ... :(</p>
  
  <p>Edit: added entity annotation (still same error)</p>