Agfdhyk

Im having trouble trying to post data to the rest endpoint. Here is he relevant code.

FROM C-URL

curl -d '{"description":"description", "image":[80,5,78], "name":"Peter"}' -H 'Content-Type: application/json' http://localhost:8080/abouts

-
this is the error i get in the C-URL response

{"timestamp":"2018-11-20T07:45:18.961+0000","status":500,"error":"Internal Server Error","message":"could not prepare statement; SQL [insert into about (id, description, image, name) values (null, ?, ?, ?)]; nested exception is org.hibernate.exception.SQLGrammarException: could not prepare statement","path":"/abouts"}

--schema.sql

create sequence hibernate_sequence start with 1 increment by 1

create table about (id bigint not null, description varchar(255), image binary(255), name varchar(255), primary key (id))

create table article (id bigint not null, description varchar(255), image binary(255), name varchar(255), primary key (id))

create table menu_item (id bigint not null, description varchar(255), image binary(255), name varchar(255), primary key (id))

--Entity Class

@Data

public class About {

@Id

@GeneratedValue(strategy=GenerationType.AUTO)

private Long id;

@NotEmpty

private String name;

@NotEmpty

private String description;

private byte image;

}

--RestController

package coffee.controller;



import coffee.*;

import coffee.data.AboutRepository;



import java.util.Optional;



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

import org.springframework.dao.EmptyResultDataAccessException;

import org.springframework.http.HttpStatus;

import org.springframework.http.ResponseEntity;

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







@RestController

@RequestMapping(path="abouts",

                produces="application/json",

                consumes="application/json")

@CrossOrigin(origins="*")

public class AboutController {



    private AboutRepository aboutRepo;



    public AboutController(AboutRepository aboutRepo) {

        this.aboutRepo = aboutRepo;

    }



    @GetMapping

    public Iterable<About> getAbouts() {

        return aboutRepo.findAll();

    }



    @GetMapping("/{aboutId}")

    public ResponseEntity<About> aboutById(@PathVariable("aboutId") Long id) {

        Optional<About> optAbout = aboutRepo.findById(id);

        if (optAbout.isPresent()){

            return new ResponseEntity<>(optAbout.get(), HttpStatus.OK);

        }

        return new ResponseEntity<>(null, HttpStatus.NOT_FOUND);

    }



    @PostMapping

    @ResponseStatus(HttpStatus.CREATED)

    public About postAbout(@RequestBody About about) {

        return aboutRepo.save(about);

    }



    @PutMapping("/{aboutId}")

    public About putAbout(@RequestBody About about) {

        return aboutRepo.save(about);

    }



    @DeleteMapping("/{aboutId")

    @ResponseStatus(code = HttpStatus.NO_CONTENT)

    public void deleteEvent (@PathVariable("aboutId") Long aboutId) {

        try {

            aboutRepo.deleteById(aboutId);

        }catch (EmptyResultDataAccessException e) {

        }

    }

}

--AboutRepo just uses Spring generated repository

package coffee.data;



import org.springframework.data.repository.CrudRepository;



import coffee.*;



public interface AboutRepository extends CrudRepository<About, Long> {

}

error in STS console when performing post in C-URL

 org.h2.jdbc.JdbcSQLException: Sequence "HIBERNATE_SEQUENCE" not found; SQL statement:

call next value for hibernate_sequence [90036-197]

    at org.h2.message.DbException.getJdbcSQLException(DbException.java:357) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.message.DbException.get(DbException.java:179) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.message.DbException.get(DbException.java:155) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readSequence(Parser.java:5970) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readTerm(Parser.java:3131) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readFactor(Parser.java:2587) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readSum(Parser.java:2574) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readConcat(Parser.java:2544) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readCondition(Parser.java:2370) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readAnd(Parser.java:2342) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readExpression(Parser.java:2334) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.parseCall(Parser.java:4854) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.parsePrepared(Parser.java:382) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.parse(Parser.java:335) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.parse(Parser.java:307) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.prepareCommand(Parser.java:278) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.engine.Session.prepareLocal(Session.java:611) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.engine.Session.prepareCommand(Session.java:549) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1247) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.jdbc.JdbcPreparedStatement.<init>(JdbcPreparedStatement.java:76) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:304) ~[h2-1.4.197.jar:1.4.197]

    at com.zaxxer.hikari.pool.ProxyConnection.prepareStatement(ProxyConnection.java:318) ~[HikariCP-2.7.9.jar:na]

    at com.zaxxer.hikari.pool.HikariProxyConnection.prepareStatement(HikariProxyConnection.java) ~[HikariCP-2.7.9.jar:na]

    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$1.doPrepare(StatementPreparerImpl.java:86) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:171) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareStatement(StatementPreparerImpl.java:72) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.id.enhanced.SequenceStructure$1.getNextValue(SequenceStructure.java:93) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.id.enhanced.NoopOptimizer.generate(NoopOptimizer.java:40) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.id.enhanced.SequenceStyleGenerator.generate(SequenceStyleGenerator.java:452) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:105) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.java:67) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:189) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:132) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:783) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:768) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    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:566) ~[na:na]

    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:350) ~[spring-orm-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at com.sun.proxy.$Proxy104.persist(Unknown Source) ~[na: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:566) ~[na:na]

    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:305) ~[spring-orm-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at com.sun.proxy.$Proxy104.persist(Unknown Source) ~[na:na]

    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:490) ~[spring-data-jpa-2.0.11.RELEASE.jar:2.0.11.RELEASE]

    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:566) ~[na:na]

    at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:377) ~[spring-data-commons-2.0.11.RELEASE.jar:2.0.11.RELEASE]

    at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200) ~[spring-data-commons-2.0.11.RELEASE.jar:2.0.11.RELEASE]

    at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:641) ~[spring-data-commons-2.0.11.RELEASE.jar:2.0.11.RELEASE]

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:605) ~[spring-data-commons-2.0.11.RELEASE.jar:2.0.11.RELEASE]

    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:590) ~[spring-data-commons-2.0.11.RELEASE.jar:2.0.11.RELEASE]

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59) ~[spring-data-commons-2.0.11.RELEASE.jar:2.0.11.RELEASE]

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294) ~[spring-tx-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:135) ~[spring-data-jpa-2.0.11.RELEASE.jar:2.0.11.RELEASE]

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61) ~[spring-data-commons-2.0.11.RELEASE.jar:2.0.11.RELEASE]

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at com.sun.proxy.$Proxy106.save(Unknown Source) ~[na:na]

    at coffee.controller.AboutController.postAbout(AboutController.java:46) ~[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:566) ~[na:na]

    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891) ~[spring-webmvc-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877) ~[spring-webmvc-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:661) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) ~[spring-webmvc-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90) ~[spring-boot-actuator-2.0.6.RELEASE.jar:2.0.6.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:155) ~[spring-boot-actuator-2.0.6.RELEASE.jar:2.0.6.RELEASE]

    at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:123) ~[spring-boot-actuator-2.0.6.RELEASE.jar:2.0.6.RELEASE]

    at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108) ~[spring-boot-actuator-2.0.6.RELEASE.jar:2.0.6.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]

    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]

    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-8.5.34.jar:8.5.34]

    at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]

When I change @GeneratedValue(strategy=GenerationType.IDENTITY), it still shows an error message both in C-URL and the STS console but a different one.
CURL

{"timestamp":"2018-11-20T08:01:15.230+0000","status":500,"error":"Internal Server Error","message":"could not prepare statement; SQL [insert into about (id, description, image, name) values (null, ?, ?, ?)]; nested exception is org.hibernate.exception.SQLGrammarException: could not prepare statement","path":"/abouts"}

STS Console

org.h2.jdbc.JdbcSQLException: Table "ABOUT" not found; SQL statement:

insert into about (id, description, image, name) values (null, ?, ?, ?) [42102-197]

    at org.h2.message.DbException.getJdbcSQLException(DbException.java:357) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.message.DbException.get(DbException.java:179) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.message.DbException.get(DbException.java:155) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readTableOrView(Parser.java:5920) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.readTableOrView(Parser.java:5897) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.parseInsert(Parser.java:1220) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.parsePrepared(Parser.java:431) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.parse(Parser.java:335) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.parse(Parser.java:307) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.command.Parser.prepareCommand(Parser.java:278) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.engine.Session.prepareLocal(Session.java:611) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.engine.Session.prepareCommand(Session.java:549) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1247) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.jdbc.JdbcPreparedStatement.<init>(JdbcPreparedStatement.java:76) ~[h2-1.4.197.jar:1.4.197]

    at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:1166) ~[h2-1.4.197.jar:1.4.197]

    at com.zaxxer.hikari.pool.ProxyConnection.prepareStatement(ProxyConnection.java:325) ~[HikariCP-2.7.9.jar:na]

    at com.zaxxer.hikari.pool.HikariProxyConnection.prepareStatement(HikariProxyConnection.java) ~[HikariCP-2.7.9.jar:na]

    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$2.doPrepare(StatementPreparerImpl.java:105) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:171) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareStatement(StatementPreparerImpl.java:107) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.dialect.identity.GetGeneratedKeysDelegate.prepare(GetGeneratedKeysDelegate.java:51) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:39) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2933) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3524) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:637) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:282) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:263) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:317) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:318) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:275) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:182) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:113) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

    at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.java:67) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

Try removing the final keyword from data members of class About and generate Getters and Setters instead. Something like this:

About.java

package com.example;



import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.validation.constraints.NotEmpty;



@Entity

public class About {

    @Id

    @GeneratedValue(strategy=GenerationType.AUTO)

    private Long id;

    @NotEmpty

    private String name;

    @NotEmpty

    private String description;

    private byte image;



    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getDescription() {

        return description;

    }

    public void setDescription(String description) {

        this.description = description;

    }

    public byte getImage() {

        return image;

    }

    public void setImage(byte image) {

        this.image = image;

    }



}

AboutRepository.java

package com.example;



import org.springframework.data.repository.CrudRepository;



public interface AboutRepository extends CrudRepository<About, Long>{



}

To see the complete code, please refer to: https://github.com/kunalpurimkbk/stackoverflow_53385609/

As Kunal has said, you need to remove final keywords from About class members and to add getters and setters.

The thing that is still missing is to add appropriate sequence generator for id.
By default hibernate_sequence table is required to hold a sequence for id.
To make things work you need to add:

@Id

@GeneratedValue(strategy = GenerationType.IDENTITY)

private Long id;