这段代码有什么问题？它抛出空错误
what is wrong in this code? it is throwing the null error
package com.vaadin.ui.view;
public class AddConsumerView extends FormLayout{
private ConsumerUI consumerUI;
@Autowired
private ConsumerServiceInterface consumerServiceInterface;
//horizontal layout for the id's
private HorizontalLayout consumerIDLayout = new HorizontalLayout();
private TextField consumer_id = new TextField("Consumer Id");
private TextField household_id = new TextField("Household Id");
private TextField legal_hold = new TextField("Legal Hold");
private TextField deceased_fg = new TextField("Deceased");
private DateTimeField deceased_dt = new DateTimeField("Deceased DateTime");
//Horizontal layout for the INS
private HorizontalLayout consumerINSLayout = new HorizontalLayout();
private TextField ins_pqid = new TextField("Ins PQID");
private TextField ins_rid = new TextField("Ins RID");
private TextField ins_efid = new TextField("Ins EFID");
private DateTimeField ins_tmstmp = new DateTimeField("Ins Date time");
// Horizontal layout for the UPD
private HorizontalLayout consumerUPDLayout = new HorizontalLayout();
private TextField upd_pqid = new TextField("Upd PQID");
private TextField upd_rid= new TextField("Upd RID");
private TextField upd_efid = new TextField("Upd EFID");
private DateTimeField upd_tmstmp = new DateTimeField("Upd Date time");
private Consumer consumerData = new Consumer();
//Buttons
private Button saveConsumerButton = new Button("save");
//binding the data to the field
private Binder<Consumer> consumerBinder = new Binder<>(Consumer.class);
public AddConsumerView(ConsumerUI consumerUI) {
this.consumerUI = consumerUI;
consumerIDLayout.addComponents(consumer_id, household_id, legal_hold, deceased_dt,deceased_fg);
consumerINSLayout.addComponents(ins_pqid, ins_rid, ins_efid, ins_tmstmp);
consumerUPDLayout.addComponents(upd_pqid,upd_rid, upd_efid, upd_tmstmp);
VerticalLayout vertical = new VerticalLayout();
vertical.addComponents(consumerIDLayout, consumerINSLayout,
consumerUPDLayout,saveConsumerButton);
//addComponent(vertical);
bindFields();
consumerBinder.setBean(new Consumer());
saveConsumerButton.setStyleName("primary");
saveConsumerButton.addClickListener(e->saveConsumer());
addComponents(vertical);
}
public void saveConsumer() {
//consumerBinder.bindInstanceFields(this);
System.out.println(consumerBinder.getBean().toString());
consumerServiceInterface.addConsumer(consumerBinder.getBean());
}
public void bindFields() {
consumerBinder.forField(consumer_id)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getConsumer_id,Consumer::setConsumer_id);
consumerBinder.forField(legal_hold)
.bind(Consumer::getLegal_hold, Consumer::setLegal_hold);
consumerBinder.forField(deceased_fg)
.bind(Consumer::getDeceased_fg, Consumer::setDeceased_fg);
consumerBinder.forField(household_id)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getHousehold_id,Consumer::setHousehold_id);
consumerBinder.forField(ins_efid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getIns_efid,Consumer::setIns_efid);
consumerBinder.forField(ins_pqid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getIns_pqid,Consumer::setIns_pqid);
consumerBinder.forField(ins_rid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getIns_rid,Consumer::setIns_rid);
consumerBinder.forField(upd_efid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getUpd_efid,Consumer::setUpd_efid);
consumerBinder.forField(upd_pqid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getUpd_pqid,Consumer::setUpd_pqid);
consumerBinder.forField(upd_rid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getUpd_rid,Consumer::setUpd_rid);
consumerBinder.forField(upd_tmstmp)
.withConverter(new StringTimestampConvertor())
.bind(Consumer::getUpd_tmstmp, Consumer::setUpd_tmstmp);
consumerBinder.forField(ins_tmstmp)
.withConverter(new StringTimestampConvertor())
.bind(Consumer::getIns_tmstmp, Consumer::setIns_tmstmp);
consumerBinder.forField(deceased_dt)
.withConverter(new StringTimestampConvertor())
.bind(Consumer::getDeceased_dt, Consumer::setDeceased_dt);
consumerBinder.forField(upd_tmstmp)
.withConverter(new StringTimestampConvertor())
.bind(Consumer::getUpd_tmstmp, Consumer::setUpd_tmstmp);
}
}
StringTimestampConvertorClass
package com.vaadin.convertor;
@SuppressWarnings("serial")
public class StringTimestampConvertor implements Converter<LocalDateTime, Timestamp> {
@SuppressWarnings("unchecked")
public Result<Timestamp> convertToModel(LocalDateTime value, ValueContext context) {
System.out.println("check"+value);
Result<Timestamp> rs = Result.ok(Timestamp.valueOf(value));
return rs;
}
@Override
public LocalDateTime convertToPresentation(Timestamp value, ValueContext context) {
// TODO Auto-generated method stub
return null;
}
}
sysout 正在工作，但 saveConsumer 函数给出空错误并且 stringtimestampconvertor 被 运行 多次。
java.lang.NullPointerException: null at
com.vaadin.ui.view.AddConsumerView.saveConsumer(AddConsumerView.java:82)
~[classes/:na] at
com.vaadin.ui.view.AddConsumerView.lambda[=14=](AddConsumerView.java:71)
~[classes/:na] at
com.vaadin.ui.view.AddConsumerView$$Lambda01/954546734.buttonClick(Unknown
Source) ~[na:na] at
sun.reflect.GeneratedMethodAccessor433.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
~[na:1.8.0_45] at java.lang.reflect.Method.invoke(Unknown Source)
~[na:1.8.0_45] at
com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
~[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.event.EventRouter.fireEvent(EventRouter.java:211)
~[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.event.EventRouter.fireEvent(EventRouter.java:174)
~[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1029)
~[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.ui.Button.fireClick(Button.java:370)
~[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.ui.Button.click(Button.java:57)
~[vaadin-server-8.0.0.jar:8.0.0] at
sun.reflect.GeneratedMethodAccessor432.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
~[na:1.8.0_45] at java.lang.reflect.Method.invoke(Unknown Source)
~[na:1.8.0_45] at
com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:155)
~[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:116)
~[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:443)
[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:415)
[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:274)
[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:90)
[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1464)
[vaadin-server-8.0.0.jar:8.0.0] at
com.vaadin.server.VaadinServlet.service(VaadinServlet.java:380)
[vaadin-server-8.0.0.jar:8.0.0] at
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
[tomcat-embed-websocket-8.5.29.jar:8.5.29] at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
[tomcat-embed-core-8.5.29.jar:8.5.29] at
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[na:1.8.0_45] at
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[na:1.8.0_45] at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
[tomcat-embed-core-8.5.29.jar:8.5.29] at java.lang.Thread.run(Unknown
Source) [na:1.8.0_45]
一切正常，除了在提交表单时 saveConsumer 函数 sysout 语句工作正常 但 consumerServiceInterface.saveConsumer(conusmerBinder.getBean()) 抛出空错误
编辑：
您能否验证您的 ConsumerServiceInterface 实例不为空？您没有在视图上使用 @Route，那么您如何在应用程序中使用此视图？如果它是通过构造函数发生的，那么 Spring 不会自动装配字段。 How does autowiring work in Spring
根据您之前在此处提出的问题：
我假设您在
获得 NPE
Result<Timestamp> rs = Result.ok(Timestamp.valueOf(value));
这是预期的，如果通过 value 则为空 JavaDocs: Timestamp valueOf。您应该在那里添加一个适当的空检查，并在此基础上进一步
此外，您为什么要返回任何 Timestamp 一个 null LocalDateTime？
你应该这样做 Datamodel Conversion:
class MyConverter implements Converter<String, Integer> {
@Override
public Result<Integer> convertToModel(String fieldValue, ValueContext context) {
// Produces a converted value or an error
try {
// ok is a static helper method that creates a Result
return Result.ok(Integer.valueOf(fieldValue));
} catch (NumberFormatException e) {
// error is a static helper method that creates a Result
return Result.error("Please enter a number");
}
}
@Override
public String convertToPresentation(Integer integer, ValueContext context) {
// Converting to the field type should always succeed,
// so there is no support for returning an error Result.
return String.valueOf(integer);
}
}
除非您通过 Spring 创建表单，否则您将无法使用 @Autowired。永远不要使用 @Autowired 字段，总是使用基于构造函数的注入，这样你会更快遇到这种问题。
然后你被迫
- 手动构建并传递所需的对象（你可以在链中更高的地方做什么，事物参与 Spring 机制（例如 Vaadin Views））
- 或者您被迫自己使用 Spring 机制（例如，从应用程序上下文中获取一个 bean）
我建议看看 docs
package com.vaadin.ui.view;
public class AddConsumerView extends FormLayout{
private ConsumerUI consumerUI;
@Autowired
private ConsumerServiceInterface consumerServiceInterface;
//horizontal layout for the id's
private HorizontalLayout consumerIDLayout = new HorizontalLayout();
private TextField consumer_id = new TextField("Consumer Id");
private TextField household_id = new TextField("Household Id");
private TextField legal_hold = new TextField("Legal Hold");
private TextField deceased_fg = new TextField("Deceased");
private DateTimeField deceased_dt = new DateTimeField("Deceased DateTime");
//Horizontal layout for the INS
private HorizontalLayout consumerINSLayout = new HorizontalLayout();
private TextField ins_pqid = new TextField("Ins PQID");
private TextField ins_rid = new TextField("Ins RID");
private TextField ins_efid = new TextField("Ins EFID");
private DateTimeField ins_tmstmp = new DateTimeField("Ins Date time");
// Horizontal layout for the UPD
private HorizontalLayout consumerUPDLayout = new HorizontalLayout();
private TextField upd_pqid = new TextField("Upd PQID");
private TextField upd_rid= new TextField("Upd RID");
private TextField upd_efid = new TextField("Upd EFID");
private DateTimeField upd_tmstmp = new DateTimeField("Upd Date time");
private Consumer consumerData = new Consumer();
//Buttons
private Button saveConsumerButton = new Button("save");
//binding the data to the field
private Binder<Consumer> consumerBinder = new Binder<>(Consumer.class);
public AddConsumerView(ConsumerUI consumerUI) {
this.consumerUI = consumerUI;
consumerIDLayout.addComponents(consumer_id, household_id, legal_hold, deceased_dt,deceased_fg);
consumerINSLayout.addComponents(ins_pqid, ins_rid, ins_efid, ins_tmstmp);
consumerUPDLayout.addComponents(upd_pqid,upd_rid, upd_efid, upd_tmstmp);
VerticalLayout vertical = new VerticalLayout();
vertical.addComponents(consumerIDLayout, consumerINSLayout,
consumerUPDLayout,saveConsumerButton);
//addComponent(vertical);
bindFields();
consumerBinder.setBean(new Consumer());
saveConsumerButton.setStyleName("primary");
saveConsumerButton.addClickListener(e->saveConsumer());
addComponents(vertical);
}
public void saveConsumer() {
//consumerBinder.bindInstanceFields(this);
System.out.println(consumerBinder.getBean().toString());
consumerServiceInterface.addConsumer(consumerBinder.getBean());
}
public void bindFields() {
consumerBinder.forField(consumer_id)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getConsumer_id,Consumer::setConsumer_id);
consumerBinder.forField(legal_hold)
.bind(Consumer::getLegal_hold, Consumer::setLegal_hold);
consumerBinder.forField(deceased_fg)
.bind(Consumer::getDeceased_fg, Consumer::setDeceased_fg);
consumerBinder.forField(household_id)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getHousehold_id,Consumer::setHousehold_id);
consumerBinder.forField(ins_efid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getIns_efid,Consumer::setIns_efid);
consumerBinder.forField(ins_pqid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getIns_pqid,Consumer::setIns_pqid);
consumerBinder.forField(ins_rid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getIns_rid,Consumer::setIns_rid);
consumerBinder.forField(upd_efid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getUpd_efid,Consumer::setUpd_efid);
consumerBinder.forField(upd_pqid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getUpd_pqid,Consumer::setUpd_pqid);
consumerBinder.forField(upd_rid)
.withConverter(new StringToLongConverter("Must be a number"))
.bind(Consumer::getUpd_rid,Consumer::setUpd_rid);
consumerBinder.forField(upd_tmstmp)
.withConverter(new StringTimestampConvertor())
.bind(Consumer::getUpd_tmstmp, Consumer::setUpd_tmstmp);
consumerBinder.forField(ins_tmstmp)
.withConverter(new StringTimestampConvertor())
.bind(Consumer::getIns_tmstmp, Consumer::setIns_tmstmp);
consumerBinder.forField(deceased_dt)
.withConverter(new StringTimestampConvertor())
.bind(Consumer::getDeceased_dt, Consumer::setDeceased_dt);
consumerBinder.forField(upd_tmstmp)
.withConverter(new StringTimestampConvertor())
.bind(Consumer::getUpd_tmstmp, Consumer::setUpd_tmstmp);
}
}
StringTimestampConvertorClass
package com.vaadin.convertor;
@SuppressWarnings("serial")
public class StringTimestampConvertor implements Converter<LocalDateTime, Timestamp> {
@SuppressWarnings("unchecked")
public Result<Timestamp> convertToModel(LocalDateTime value, ValueContext context) {
System.out.println("check"+value);
Result<Timestamp> rs = Result.ok(Timestamp.valueOf(value));
return rs;
}
@Override
public LocalDateTime convertToPresentation(Timestamp value, ValueContext context) {
// TODO Auto-generated method stub
return null;
}
}
sysout 正在工作，但 saveConsumer 函数给出空错误并且 stringtimestampconvertor 被 运行 多次。
java.lang.NullPointerException: null at com.vaadin.ui.view.AddConsumerView.saveConsumer(AddConsumerView.java:82) ~[classes/:na] at com.vaadin.ui.view.AddConsumerView.lambda[=14=](AddConsumerView.java:71) ~[classes/:na] at com.vaadin.ui.view.AddConsumerView$$Lambda01/954546734.buttonClick(Unknown Source) ~[na:na] at sun.reflect.GeneratedMethodAccessor433.invoke(Unknown Source) ~[na:na] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_45] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_45] at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510) ~[vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:211) ~[vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:174) ~[vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1029) ~[vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.ui.Button.fireClick(Button.java:370) ~[vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.ui.Button.click(Button.java:57) ~[vaadin-server-8.0.0.jar:8.0.0] at sun.reflect.GeneratedMethodAccessor432.invoke(Unknown Source) ~[na:na] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_45] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_45] at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:155) ~[vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:116) ~[vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:443) [vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:415) [vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:274) [vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:90) [vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41) [vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1464) [vaadin-server-8.0.0.jar:8.0.0] at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:380) [vaadin-server-8.0.0.jar:8.0.0] at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.29.jar:8.5.29] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) [tomcat-embed-core-8.5.29.jar:8.5.29] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.29.jar:8.5.29] at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_45] at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_45] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.29.jar:8.5.29] at java.lang.Thread.run(Unknown Source) [na:1.8.0_45]
一切正常，除了在提交表单时 saveConsumer 函数 sysout 语句工作正常 但 consumerServiceInterface.saveConsumer(conusmerBinder.getBean()) 抛出空错误
编辑：
您能否验证您的 ConsumerServiceInterface 实例不为空？您没有在视图上使用 @Route，那么您如何在应用程序中使用此视图？如果它是通过构造函数发生的，那么 Spring 不会自动装配字段。 How does autowiring work in Spring
根据您之前在此处提出的问题：
Result<Timestamp> rs = Result.ok(Timestamp.valueOf(value));
这是预期的，如果通过 value 则为空 JavaDocs: Timestamp valueOf。您应该在那里添加一个适当的空检查，并在此基础上进一步
此外，您为什么要返回任何 Timestamp 一个 null LocalDateTime？
你应该这样做 Datamodel Conversion:
class MyConverter implements Converter<String, Integer> {
@Override
public Result<Integer> convertToModel(String fieldValue, ValueContext context) {
// Produces a converted value or an error
try {
// ok is a static helper method that creates a Result
return Result.ok(Integer.valueOf(fieldValue));
} catch (NumberFormatException e) {
// error is a static helper method that creates a Result
return Result.error("Please enter a number");
}
}
@Override
public String convertToPresentation(Integer integer, ValueContext context) {
// Converting to the field type should always succeed,
// so there is no support for returning an error Result.
return String.valueOf(integer);
}
}
除非您通过 Spring 创建表单，否则您将无法使用 @Autowired。永远不要使用 @Autowired 字段，总是使用基于构造函数的注入，这样你会更快遇到这种问题。
然后你被迫
- 手动构建并传递所需的对象（你可以在链中更高的地方做什么，事物参与 Spring 机制（例如 Vaadin Views））
- 或者您被迫自己使用 Spring 机制（例如，从应用程序上下文中获取一个 bean）
我建议看看 docs