Hibernate always get java.lang.IllegalArgumentException: Can not set java.lang.Long field

Question

I got trouble with hibernate and don't know how to fix it.

All may class files;

Bean:

@Data
@AllArgsConstructor
@NoArgsConstructor
@Entity
@NamedQuery(name="Book.getBookList", query="from Book")
public class Book {
    @Id
    @GeneratedValue
    private Long id;
    private String name;
    private String author;

    public Book(String name, String author) {
        super();
        this.name = name;
        this.author = author;
    }
}

Controller:

@Controller
public class BookController {

    @Autowired
    private BookRepository bookRepo;
    private DAO dao = new DAO();

    @GetMapping("/")
    public String showpage(Model model, @RequestParam(defaultValue="0") int page) {
        model.addAttribute("data", bookRepo.findAll(PageRequest.of(page,4)));
        model.addAttribute("currentPage",page);
        return "index";
    }

    @PostMapping("/save")
    public String save(Book book) {
        System.out.println(book);
        bookRepo.save(book);
        dao.saveBook(book);
        return "redirect:/";
    }

    @GetMapping("/delete")
    public String delete(Long id) {
        bookRepo.deleteById(id);
        dao.deleteBook(id);
        return "redirect:/";
    }

    @GetMapping("/findOne")
    @ResponseBody
    public Optional<Book> findone(Long id) {
        return bookRepo.findById(id);
    }
}

Dao:

public class DAO {

    SessionFactory sessionFactory = new Configuration()
            .configure("ca/sheridancollege/config/hibernate.cfg.xml")
            .buildSessionFactory();

    public DAO() {
        super();
    }

    public void saveBook(Book book) {
        Session session = sessionFactory.openSession();
        session.beginTransaction();

        session.saveOrUpdate(book);

        session.getTransaction().commit();
        session.close();
    }

    public List<Book> getBookList() {
        Session session = sessionFactory.openSession();
        session.beginTransaction();

        Query query = session.createNamedQuery("Book.getBookList"); 
        List<Book> bookList = query.getResultList();

        session.getTransaction().commit();
        session.close();

        return bookList;
    }

    public void deleteBook(Long id) {
        Session session = sessionFactory.openSession();
        session.beginTransaction();

        Book toDelete = session.get(Book.class, id);
        session.delete(toDelete);

        session.getTransaction().commit();
        session.close();
    }
}

Whenever I am calling /save, getting below error.

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue Dec 04 16:34:24 EST 2018
There was an unexpected error (type=Internal Server Error, status=500).
Error accessing field [private java.lang.Long ca.sheridancollege.beans.Book.id] by reflection for persistent property [ca.sheridancollege.beans.Book#id] : Book(id=11, name=, author=)
org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [private java.lang.Long ca.sheridancollege.beans.Book.id] by reflection for persistent property [ca.sheridancollege.beans.Book#id] : Book(id=11, name=, author=)
    at org.hibernate.property.access.spi.GetterFieldImpl.get(GetterFieldImpl.java:75)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:224)
    at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4931)
    at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4631)
    at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:226)
    at org.hibernate.event.internal.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:540)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:83)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
    at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:678)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:670)
    at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:665)
    at ca.sheridancollege.dao.DAO.saveBook(DAO.java:28)
    at ca.sheridancollege.controllers.BookController.save(BookController.java:36)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:791)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: Can not set java.lang.Long field ca.sheridancollege.beans.Book.id to ca.sheridancollege.beans.Book
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167)
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171)
    at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:58)
    at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36)
    at java.lang.reflect.Field.get(Field.java:393)
    at org.hibernate.property.access.spi.GetterFieldImpl.get(GetterFieldImpl.java:71)
    ... 66 more

What I am doing wrong? Thanks in advance.

Answer 1

You have denoted that the ID column is auto-incremental but the auto-increment index stored at the Database side only. So you have to set ID column auto-incremental enabled in table configuration(if using workbench) from DB side.

Hibernate annotation sets the same thing at db side if you could have created table definition by API side. (you can do that by setting property value entry spring.jpa.hibernate.ddl-auto=create) The values create, create-drop, validate, and update basically influence how the schema tool management will manipulate the database schema at startup. For more info about same refer How does spring.jpa.hibernate.ddl-auto property exactly work in Spring?

Happy Coding!!

Answer 2

This sample below code work fine! I used spring-boot version 1.5.10 for this sample.

AppConfig

@Configuration
@ComponentScan(basePackages = "com.test")
public class AppConfig {

    @Autowired
    private EntityManagerFactory entityManagerFactory;

    @Bean
    public SessionFactory getSessionFactory() {
        if (entityManagerFactory.unwrap(SessionFactory.class) == null) {
            throw new NullPointerException("factory is not a hibernate factory");
        }
        return entityManagerFactory.unwrap(SessionFactory.class);
    }

application.properties

spring.datasource.url=jdbc:mysql://test/testAPI?createDatabaseIfNotExist=true&autoReconnect=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
spring.jpa.properties.hibernate.enable_lazy_load_no_trans=false

BookController

@RestController
@RequestMapping("/test")
public class BookController {

    @Autowired
    private DAO bookRepo;

    @PostMapping("/save")
    public String save(@RequestBody Book book) {
        System.out.println(book);
        bookRepo.saveBook(book);
        return "redirect:/";
    }
}

Book

@Data
@AllArgsConstructor
@NoArgsConstructor
@Entity
@NamedQuery(name="Book.getBookList", query="from Book")
public class Book {

    @Id
    @GeneratedValue
    private Long id;
    private String name;
    private String author;

    public Book(String name, String author) {
        super();
        this.name = name;
        this.author = author;
    }
}

DAO

@Repository
public class DAO {

    @Autowired
    private SessionFactory sessionFactory;


    public void saveBook(Book book) {
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.saveOrUpdate(book);
        session.getTransaction().commit();
        session.close();
    }
}

SecurityConfig

@EnableWebSecurity
@Configuration
class SecurityConfig extends WebSecurityConfigurerAdapter {
    public SecurityConfig() {

    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                .cors().and()
                .csrf().disable()
                .authorizeRequests()
                .antMatchers("/").permitAll()
                .and()
                .exceptionHandling()
                .and()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
    }

    @Bean
    CorsConfigurationSource corsConfigurationSource() {
        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", new CorsConfiguration().applyPermitDefaultValues());
        return source;
    }
}

then call localhost:8080/test/save body:

 {
    "name":"test",
    "author":"test1"
}

response :

redirect:/

Answer 3

Your Book Bean has private fields, but no getters and setters.

Add:

public Long getId()
{
    return id;
}

public void setId(Long id)
{
    this.id = id;
}