Question

酒：

@Entity
@Table
public class Wine {

    @Id
    @GeneratedValue
    @Column
    private Long id;
    @Column
    private String name;
    @Column
    private Double alcoholPercent;
    @Column
    private Double price;
    @Column
    private int quantity;
    @Column
    private Date vintage;
    @ManyToOne(fetch=FetchType.EAGER)
    private Company company;
    @ManyToOne(fetch=FetchType.EAGER)
    private Type type;
}

Wine DTO：

public class WineDTO {
    private Long id;
    private String name;
    private Double alcoholPercent;
    private Double price;
    private int quantity;
    private Date vintage;
    private Long companyId;
    private String companyName;
    private String companyPib;
    private String companyCountry;
    private Long typeId;
    private String typeName;
}

WineToWineDTO：

@Component
public class WineToWineDTO 
    implements Converter<Wine, WineDTO>{

    @Override
    public WineDTO convert(Wine c) {
        WineDTO dto=new WineDTO();
        dto.setId(c.getId());
        dto.setName(c.getName());
        dto.setAlcoholPercent(c.getAlcoholPercent());
        dto.setPrice(c.getPrice());
        dto.setQuantity(c.getQuantity());
        dto.setVintage(c.getVintage());
        dto.setCompanyId(c.getCompany().getId());
        dto.setCompanyName(c.getCompany().getName());
        dto.setCompanyPib(c.getCompany().getPib());
        dto.setCompanyCountry(c.getCompany().getCountry());
        dto.setTypeId(c.getType().getId());
        dto.setTypeName(c.getType().getName());


        return dto;
    }

    @RequestMapping(method=RequestMethod.POST)
    public ResponseEntity<WineDTO> add(
            @RequestBody WineDTO newWine){

        Wine wine = toWine.convert(newWine); 
        wineService.save(wine);

        return new ResponseEntity<>(toDTO.convert(wine),
                HttpStatus.CREATED);
    }
}

当我请求发布新对象时，我的控制器会发布除了类型ID之外的所有列。有人能告诉我哪里弄错了吗？感谢。

java.lang.NullPointerException：null 在org.wineShop.wine.support.WineToWineDTO.convert（WineToWineDTO.java:28）在org.wineShop.wine.web.controller.ApiWineController.add（ApiWineController.java:61） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method） at sun.reflect.NativeMethodAccessorImpl.invoke（Unknown Source） at sun.reflect.DelegatingMethodAccessorImpl.invoke（Unknown Source） at java.lang.reflect.Method.invoke（Unknown Source）在org.springframework.web.method.support.InvocableHandlerMethod.doInvoke（InvocableHandlerMethod.java:221）在org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest（InvocableHandlerMethod.java:137）在org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod.java:110）在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod（RequestMappingHandlerAdapter.java:775）在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:705）在org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:85）在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:959）在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:893）在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:967）在org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:869）在javax.servlet.http.HttpServlet.service（HttpServlet.java:648）在org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:843）在javax.servlet.http.HttpServlet.service（HttpServlet.java:729）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:291）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:77）在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:85）在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:217）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:106）在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:502）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:142） at org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:79）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:88）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:518）在org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1091） at org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:673）在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1500）在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.run（NioEndpoint.java:1456） at java.util.concurrent.ThreadPoolExecutor.runWorker（Unknown Source） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（Unknown Source） at org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）在java.lang.Thread.run（未知来源）

为什么spring controller，方法POST转换DTO类时会抛出null异常？

0 个答案: