[英]java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Long
當我嘗試顯示購物車時，我不斷收到 classcastexception。 我正在使用 spring 實現書店系統，直到之后一切正常。 下面是我的購物車 controller 和相關的 class。 我會很感激我能得到的任何幫助。 謝謝
package com.bookstore.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import com.bookstore.domain.Book;
import com.bookstore.domain.CartItem;
import com.bookstore.domain.CustomerUserDetails;
import com.bookstore.domain.ShoppingCart;
import com.bookstore.domain.User;
import com.bookstore.repository.UserRepo;
import com.bookstore.services.BookService;
import com.bookstore.services.CartItemService;
import com.bookstore.services.ShoppingCartService;
import com.bookstore.services.UserServices;
@Controller
@RequestMapping("/shoppingCart")
public class ShoppingCartController {
@Autowired
private UserServices userService;
@Autowired
private UserRepo repo;
@Autowired
private BookService bookService;
@Autowired
private CartItemService cartItemService;
@Autowired
private ShoppingCartService ShoppingCartService;
@RequestMapping("/cart")
public String shoppingCart(Model model) {
Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
String emailaddress = null;
if(principal != null )
{
emailaddress = ((CustomerUserDetails)principal).getEmailaddress();
}
User user = repo.findByEmail(emailaddress);
ShoppingCart shoppingCart = (ShoppingCart) user.getShoppingCart();
List<CartItem> cartItemList = cartItemService.findByShoppingCart(shoppingCart);
ShoppingCartService.updateShoppingCart(shoppingCart);
model.addAttribute("cartItemList", cartItemList);
model.addAttribute("shoppingCart", shoppingCart);
return "cartView";
}
@RequestMapping(value = "/addItem", method = RequestMethod.POST)
public String addItem(
@ModelAttribute("book") Book book,
@ModelAttribute("qty") String qty,
Model model
) {
Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
String emailaddress = null;
if(principal != null)
{
emailaddress = ((CustomerUserDetails)principal).getEmailaddress();
}
User user = repo.findByEmail(emailaddress);
book = bookService.findById(book.getBookid());
System.out.println(book.getBookid());
System.out.println(emailaddress);
if (Integer.parseInt(qty) > book.getInStockNumber()) {
model.addAttribute("notEnoughStock", true);
return "forward:/bookDetail?id="+book.getBookid();
}
CartItem cartItem = cartItemService.addBookToCartItem(book, user, Integer.parseInt(qty));
model.addAttribute("addBookSuccess", true);
return "forward:/bookDetail?id="+book.getBookid();
}
@RequestMapping("/updateCartItem")
public String updateShoppingCart(
@ModelAttribute("id") Long cartItemId,
@ModelAttribute("qty") int qty
) {
CartItem cartItem = cartItemService.findById(cartItemId);
cartItem.setQty(qty);
cartItemService.updateCartItem(cartItem);
System.out.println("true");
return "forward:/shoppingCart/cart";
}
@RequestMapping("/removeItem")
public String removeItem(@RequestParam("id") Long id) {
cartItemService.removeCartItem(cartItemService.findById(id));
return "forward:/shoppingCart/cart";
}
}
這是錯誤跟蹤
Wed Apr 28 05:06:37 EDT 2021
There was an unexpected error (type=Internal Server Error, status=500).
class java.lang.Integer cannot be cast to class java.lang.Long (java.lang.Integer and java.lang.Long are in module java.base of loader 'bootstrap')
java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Long (java.lang.Integer and java.lang.Long are in module java.base of loader 'bootstrap')
at org.hibernate.type.descriptor.java.LongTypeDescriptor.unwrap(LongTypeDescriptor.java:19)
at org.hibernate.type.descriptor.sql.BigIntTypeDescriptor$1.doBind(BigIntTypeDescriptor.java:46)
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:73)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:276)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:271)
at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:2227)
at org.hibernate.loader.Loader.bindParameterValues(Loader.java:2196)
at org.hibernate.loader.Loader.bindPreparedStatement(Loader.java:2131)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:2108)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2040)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2018)
at org.hibernate.loader.Loader.doQuery(Loader.java:948)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:349)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:319)
at org.hibernate.loader.Loader.loadEntity(Loader.java:2421)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:77)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:66)
at org.hibernate.persister.entity.AbstractEntityPersister.loadByUniqueKey(AbstractEntityPersister.java:2471)
at org.hibernate.type.EntityType.loadByUniqueKey(EntityType.java:754)
at org.hibernate.type.EntityType.resolve(EntityType.java:467)
at org.hibernate.engine.internal.TwoPhaseLoad$EntityResolver.lambda$static$0(TwoPhaseLoad.java:605)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntityEntryLoadedState(TwoPhaseLoad.java:248)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:182)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:151)
at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.performTwoPhaseLoad(AbstractRowReader.java:247)
at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.finishUp(AbstractRowReader.java:208)
at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:96)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:105)
at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:285)
at org.hibernate.persister.entity.AbstractEntityPersister.doLoad(AbstractEntityPersister.java:4436)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4426)
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:569)
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:537)
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:208)
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:332)
at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:108)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:74)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:104)
at org.hibernate.internal.SessionImpl.fireLoadNoChecks(SessionImpl.java:1186)
at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1051)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:697)
at org.hibernate.type.EntityType.resolve(EntityType.java:464)
at org.hibernate.type.ManyToOneType.resolve(ManyToOneType.java:240)
at org.hibernate.engine.internal.TwoPhaseLoad$EntityResolver.lambda$static$0(TwoPhaseLoad.java:605)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntityEntryLoadedState(TwoPhaseLoad.java:248)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:182)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:151)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1199)
at org.hibernate.loader.Loader.processResultSet(Loader.java:1001)
at org.hibernate.loader.Loader.doQuery(Loader.java:959)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:349)
at org.hibernate.loader.Loader.doList(Loader.java:2849)
at org.hibernate.loader.Loader.doList(Loader.java:2831)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2663)
at org.hibernate.loader.Loader.list(Loader.java:2658)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:506)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:400)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:219)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1414)
at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1625)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1593)
at org.hibernate.query.Query.getResultList(Query.java:165)
at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:76)
at org.springframework.data.jpa.repository.query.JpaQueryExecution$CollectionExecution.doExecute(JpaQueryExecution.java:126)
at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:88)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:155)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:143)
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137)
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121)
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:152)
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:131)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:145)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215)
at com.sun.proxy.$Proxy112.findByShoppingCart(Unknown Source)
at com.bookstore.services.impl.CartItemServiceImpl.findByShoppingCart(CartItemServiceImpl.java:30)
at com.bookstore.controller.ShoppingCartController.shoppingCart(ShoppingCartController.java:56)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.servlet.resource.ResourceUrlEncodingFilter.doFilter(ResourceUrlEncodingFilter.java:67)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:327)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:115)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:81)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:126)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:81)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:105)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:101)
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:92)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:149)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:218)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:212)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1707)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
這是 cartItemServiceImpl class
package com.bookstore.services.impl;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.bookstore.domain.Book;
import com.bookstore.domain.BookToCartItem;
import com.bookstore.domain.CartItem;
import com.bookstore.domain.ShoppingCart;
import com.bookstore.domain.User;
import com.bookstore.repository.CartItemRepository;
import com.bookstore.services.CartItemService;
import com.bookstore.repository.BookToCartItemRepository;
@Service
public class CartItemServiceImpl implements CartItemService{
@Autowired
private CartItemRepository cartItemRepository;
@Autowired
private BookToCartItemRepository bookToCartItemRepository;
public List<CartItem> findByShoppingCart(ShoppingCart shoppingCart) {
return cartItemRepository.findByShoppingCart(shoppingCart);
}
public CartItem updateCartItem(CartItem cartItem) {
BigDecimal bigDecimal = new BigDecimal(cartItem.getBook().getPrice()).multiply(new BigDecimal(cartItem.getQty()));
bigDecimal = bigDecimal.setScale(2, RoundingMode.HALF_UP);
cartItem.setSubtotal(bigDecimal);
cartItemRepository.save(cartItem);
return cartItem;
}
public CartItem addBookToCartItem(Book book, User user, int qty) {
List<CartItem> cartItemList = findByShoppingCart(user.getShoppingCart());
for (CartItem cartItem : cartItemList) {
if(book.getBookid() == cartItem.getBook().getBookid()) {
cartItem.setQty(cartItem.getQty()+qty);
cartItem.setSubtotal(new BigDecimal(book.getPrice()).multiply(new BigDecimal(qty)));
cartItemRepository.save(cartItem);
return cartItem;
}
}
CartItem cartItem = new CartItem();
cartItem.setShoppingCart(user.getShoppingCart());
cartItem.setBook(book);
cartItem.setQty(qty);
cartItem.setSubtotal(new BigDecimal(book.getPrice()).multiply(new BigDecimal(qty)));
cartItem = cartItemRepository.save(cartItem);
BookToCartItem bookToCartItem = new BookToCartItem();
bookToCartItem.setBook(book);
bookToCartItem.setCartItem(cartItem);
bookToCartItemRepository.save(bookToCartItem);
return cartItem;
}
public CartItem findById(Long id) {
return cartItemRepository.findById(id).orElse(null);
}
public void removeCartItem(CartItem cartItem) {
bookToCartItemRepository.deleteByCartItem(cartItem);
cartItemRepository.delete(cartItem);
}
public CartItem save(CartItem cartItem) {
return cartItemRepository.save(cartItem);
}
}
這是 cartItemRepository
@Transactional
public interface CartItemRepository extends CrudRepository<CartItem, Long>{
List<CartItem> findByShoppingCart(ShoppingCart shoppingCart);
}
這是 caritem 實體，我從未將 id 定義為 Integer
package com.bookstore.domain;
import java.math.BigDecimal;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import com.fasterxml.jackson.annotation.JsonIgnore;
@Entity
public class CartItem {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private int qty;
private BigDecimal subtotal;
@OneToOne
private Book book;
@OneToMany(mappedBy = "cartItem")
@JsonIgnore
private List<BookToCartItem> bookToCartItemList;
@ManyToOne
@JoinColumn(name="shopping_cart_id")
private ShoppingCart shoppingCart;
@ManyToOne
@JoinColumn(name="order_id")
private Order order;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public int getQty() {
return qty;
}
public void setQty(int qty) {
this.qty = qty;
}
public BigDecimal getSubtotal() {
return subtotal;
}
public void setSubtotal(BigDecimal subtotal) {
this.subtotal = subtotal;
}
public Book getBook() {
return book;
}
public void setBook(Book book) {
this.book = book;
}
public List<BookToCartItem> getBookToCartItemList() {
return bookToCartItemList;
}
public void setBookToCartItemList(List<BookToCartItem> bookToCartItemList) {
this.bookToCartItemList = bookToCartItemList;
}
public ShoppingCart getShoppingCart() {
return shoppingCart;
}
public void setShoppingCart(ShoppingCart shoppingCart) {
this.shoppingCart = shoppingCart;
}
public Order getOrder() {
return order;
}
public void setOrder(Order order) {
this.order = order;
}
}
很可能，您在 CartItem 中將主 ID 定義為 Integer，這與您在存儲庫接口中定義的通用類型 Long 沖突。 請發布 CartItem class - 這將有助於確認這一點。
我認為問題出在book上，因為它沒有定義連接列。 在加載CartItem期間，它會像您定義的那樣急切地加載這本書（ @OneToOne和@ManyToOne上的默認獲取類型是 EAGER）。 我猜 Hibernate 在這種情況下使用主鍵作為連接列，它是Long類型。 Book的主鍵可能是Integer 。 調整此映射，它將起作用。
java.lang.ClassCastException：java.lang.Long 不能在 java 1.6 中轉換為 java.lang.Integer
[英]java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer in java 1.6
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long in hibernate
[英]java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long in hibernate
Java 中的 JSON 加載：java.lang.ClassCastException：java.lang.Long 不能轉換為 java.lang.Integer
[英]JSON Loading in Java: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
SDN4 java.lang.ClassCastException：使用AttributeConverter時無法將java.lang.Integer強制轉換為java.lang.Long
[英]SDN4 java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long when using AttributeConverter
Hibernate HQL強制轉換java.lang.ClassCastException：java.lang.Integer無法強制轉換為java.lang.Long
[英]Hibernate HQL casting java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long
serverError：類java.lang.ClassCastException java.lang.Integer無法轉換為java.lang.String
[英]serverError: class java.lang.ClassCastException java.lang.Integer cannot be cast to java.lang.String
java.lang.ClassCastException：無法強制轉換java.lang.Integer
[英]java.lang.ClassCastException: java.lang.Integer cannot be cast
java.lang.ClassCastException：不能強制轉換為java.lang.Long
[英]java.lang.ClassCastException: cannot be cast to java.lang.Long
java.lang.ClassCastException：無法轉換為java.lang.Integer
[英]java.lang.ClassCastException: cannot be cast to java.lang.Integer
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