Bdtjtk

im trying to learn how restful service works in java. but i came across this problem which i cant seem to figure out. i'm trying to call this controller to which will take data and store it in a database. but the exception i get is something i haven't came across before. if i remove the model class as a parameter and try to return just a basic string it works fine. but my goal is to store what ever data that is passed to the controller in a database.

enter code here

person.java // model class

@Entity

@Table(name = "Person")

@EntityListeners(AuditingEntityListener.class)

@JsonIgnoreProperties(value = {"createdAt", "updatedAt"}, allowGetters = true)



public class Person implements Serializable {



    @JsonProperty("key")

    public int getKey() {

        return key;

    }



    public void setKey(int key) {

        this.key = key;

    }





    @JsonProperty("name")

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }



    @JsonProperty("m")

    public int getMotherKey() {

        return motherKey;

    }

    public void setMotherKey(int motherKey) {

        this.motherKey = motherKey;

    }

    @JsonProperty("f")

    public int getFatherKey() {

        return fatherKey;

    }

    public void setFatherKey(int fatherKey) {

        this.fatherKey = fatherKey;

    }



    @JsonProperty("dob")

    public int getDateOfBirth() {

        return DateOfBirth;

    }

    public void setDateOfBirth(int dateOfBirth) {

        DateOfBirth = dateOfBirth;

    }



    @JsonProperty("g")

    public String getGender() {

        return gender;

    }

    public void setGender(String gender) {

        this.gender = gender;

    }







    public Person() {







    }





    @NotNull

    int key;    

    @NotBlank

    String name;

    @NotNull

    int motherKey;

    @NotNull

    int fatherKey;

    @NotNull

    int DateOfBirth; //19921210->December 10th 1992 

    @NotBlank

    String gender;

**Controller class **

package com.example.FamilyTree;

import java.util.List;

import javax.validation.Valid;

import org.springframework.http.ResponseEntity;

import org.springframework.web.bind.annotation.DeleteMapping;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestBody;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import Repository.TreeRepository;

import exception.ResourceNotFoundException;

import model.Person;









@RestController

@RequestMapping("/api")

public class FamilityTreeController {





    TreeRepository  treeRepository;







    @PostMapping("/addPerson")

    public Person addPerson(@Valid @RequestBody Person person) {





        return treeRepository.save( person);



    }

}

Exception
at

com.example.FamilyTree.FamilityTreeController.addPerson(FamilityTreeController.java:32) ~[classes/:na]

    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]

    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]

    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]

    at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]

    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) ~[tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:791) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135) [na:na]

    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [na:na]

    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.13.jar:9.0.13]

    at java.base/java.lang.Thread.run(Thread.java:844) [na:na]

Respository

package Repository;



import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.data.jpa.repository.JpaRepository;



import model.Person;





public interface TreeRepository extends JpaRepository<Person, Integer> {







}

Full stack trace from Postman

{

    "timestamp": "2019-01-03T14:06:28.971+0000",

    "status": 500,

    "error": "Internal Server Error",

    "message": "No message available",

    "trace": "java.lang.NullPointerExceptionntat com.example.FamilyTree.FamilityTreeController.addPerson(FamilityTreeController.java:27)ntat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)ntat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)ntat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)ntat java.base/java.lang.reflect.Method.invoke(Method.java:564)ntat org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189)ntat org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)ntat org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)ntat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)ntat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800)ntat org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)ntat org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)ntat org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)ntat org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)ntat org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)ntat javax.servlet.http.HttpServlet.service(HttpServlet.java:660)ntat org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)ntat javax.servlet.http.HttpServlet.service(HttpServlet.java:741)ntat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)ntat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)ntat org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)ntat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)ntat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)ntat org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)ntat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)ntat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)ntat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)ntat org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)ntat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)ntat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)ntat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)ntat org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)ntat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)ntat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)ntat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)ntat org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)ntat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)ntat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)ntat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)ntat org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)ntat org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)ntat org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)ntat org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)ntat org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)ntat org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)ntat org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)ntat org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)ntat org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)ntat org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:791)ntat org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)ntat org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)ntat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)ntat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)ntat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)ntat java.base/java.lang.Thread.run(Thread.java:844)n",

    "path": "/api/addPerson"

}

**FamilyTreeApplication class **

package com.example.FamilyTree;



import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.data.jpa.repository.config.EnableJpaAuditing;



import controller.FamilityTreeController;



@SpringBootApplication

@EnableJpaAuditing

public class FamilyTreeApplication {

    public static void main(String args) {

        SpringApplication.run(FamilyTreeApplication.class, args);

    }



}

updated Packages structure

**cmd **

 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaAuditingHandler': Cannot resolve reference to bean 'jpaMappingContext' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaMappingContext': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: At least one JPA metamodel must be present!

        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:378) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:110) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:662) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:188) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1308) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1154) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:538) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]

        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]

        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]

        at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]

        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]

        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]

        at com.example.FamilyTree.FamilyTreeApplication.main(FamilyTreeApplication.java:22) [classes/:na]

        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]

        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]

        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]

        at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]

        at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.1.1.RELEASE.jar:2.1.1.RELEASE]

    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaMappingContext': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: At least one JPA metamodel must be present!

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1745) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:367) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        ... 26 common frames omitted

    Caused by: java.lang.IllegalArgumentException: At least one JPA metamodel must be present!

        at org.springframework.util.Assert.notEmpty(Assert.java:464) ~[spring-core-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.data.jpa.mapping.JpaMetamodelMappingContext.<init>(JpaMetamodelMappingContext.java:57) ~[spring-data-jpa-2.1.3.RELEASE.jar:2.1.3.RELEASE]

        at org.springframework.data.jpa.repository.config.JpaMetamodelMappingContextFactoryBean.createInstance(JpaMetamodelMappingContextFactoryBean.java:80) ~[spring-data-jpa-2.1.3.RELEASE.jar:2.1.3.RELEASE]

        at org.springframework.data.jpa.repository.config.JpaMetamodelMappingContextFactoryBean.createInstance(JpaMetamodelMappingContextFactoryBean.java:44) ~[spring-data-jpa-2.1.3.RELEASE.jar:2.1.3.RELEASE]

        at org.springframework.beans.factory.config.AbstractFactoryBean.afterPropertiesSet(AbstractFactoryBean.java:142) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]

        ... 33 common frames omitted

The problem is that treeRepository is not injected by Spring and thus is null.

First, make sure that the TreeRepository is properly configured by adding @EnableJpaRepositories(basePackages = "<package of your repository interface>")) to your Spring config class (FamilyTreeApplication).

Then to inject it properly, you should either add an @Autowired annotation :

@Autowired

private TreeRepository treeRepository;

or have it injected in a constructor, which is the preferred way according to the Spring team.

private TreeRepository treeRepository;



//@Autowired not needed, implicit as of Spring 4.3

public FamilityTreeController(TreeRepository treeRepository) {

  this.treeRepository = treeRepository;

}

Also there's something off with your package hierarchy that might impact how components are found by Spring Boot : your main config class (FamilyTreeApplication) should be located in the app "base package" and all other classes in sub packages, something like that :

com.example.familytree

|_ FamilyTreeApplication.java

|_ controller

   |_ FamilyTreeController.java

|_ repository

   |_ TreeRepositry.java

...

You are missing the @Repository annotation on your repository:

@Repository

public interface TreeRepository extends JpaRepository<Person, Integer> { }

And remember to add the @Autowired to inject the repository:

    @Autowired

    private TreeRepository treeRepository;

UPDATE

It seems Spring is not able to find the bean even with @Repository added. I would suggest you to put all your packages under com.example and add a component scan configuration referencing that package.

It is best if you use a service class

This annotation serves as a specialization of @Component, allowing for implementation classes to be autodetected through classpath scanning.

@Service

public class TreeService {

      @Autowired

      TreeRepository treeRepository;



      public Person save(Person person) {

         return treeRepository.save(person);

      }

}

Change your Controller class as this:

@RestController

@RequestMapping("/api")

public class FamilityTreeController {



@Autowired 

TreeService  treeService;



@PostMapping("/addPerson")

public Person addPerson(@Valid @RequestBody Person person) {

    return treeService.save( person);

   }

}

Please make the package names lowercase and follow the naming convention:

Change this: Repository.TreeRepository to this: com.example.repository.TreeRepository and for others too: com.example.model.Person com.example.exception.ResourceNotFoundException