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GWT / JAVA未捕获的异常已逃脱

分类：编程问答

如何解决GWT / JAVA未捕获的异常已逃脱

| 我的代码有问题，我似乎无法解决。我想在提交按钮时向Java / GWT中的数组列表添加一些客户数据。 我从中添加数据的形式。 
ok.addClickHandler(new ClickHandler() {
        public void onClick(ClickEvent event) {
            if (!voornaamTB.getText().equalsIgnoreCase(\"\") && !achternaamTB.getText().equalsIgnoreCase(\"\") && !emailTB.getText().equalsIgnoreCase(\"\") && !geboortedatumTB.getText().equalsIgnoreCase(\"\")) {
                boolean addVG;
                System.out.println(voornaamTB.getText());
                System.out.println(tussenvoegselTB.getText());
                System.out.println(achternaamTB.getText());
                System.out.println(emailTB.getText());
                System.out.println(geboortedatumTB.getText());
--> the error is generated here addVG = VGC.addVakantieganger(voornaamTB.getText(),tussenvoegselTB.getText(),achternaamTB.getText(),emailTB.getText(),geboortedatumTB.getText());
                if (addVG) {
                    Window.alert(\"Vakantieganger toegevoegd.\");
                } else {
                    Window.alert(\"Vakantieganger niet toegevoegd.\");
                }
            } else {
                voornaamTB.addStyleName(\"invalide-TextBox\");
                tussenvoegselTB.addStyleName(\"invalide-TextBox\");
                achternaamTB.addStyleName(\"invalide-TextBox\");
                emailTB.addStyleName(\"invalide-TextBox\");
                geboortedatumTB.addStyleName(\"invalide-TextBox\");
            }
        }
    });
控制器类。 
import java.util.ArrayList;

import com.vakantievibes.client.domein.Vakantieganger;

public class VakantiegangerController {
    private String msg;
    private ArrayList<Vakantieganger> vakantiegangers = new ArrayList<Vakantieganger>();

    public VakantiegangerController(){

    }

@SuppressWarnings(\"static-access\")
public boolean heeftVakantieganger(String email) {
    boolean result = false;
    for (Vakantieganger v : vakantiegangers) {
        if (v.getEmail().equalsIgnoreCase(email)){
            result = true;
        }
    }
    return result;
}

public boolean addVakantieganger(String voornaam,String tussenvoegsel,String achternaam,String email,String geboortedatum) {
    //boolean result = false;

    //if (!heeftVakantieganger(email)) {
        Vakantieganger v = new Vakantieganger(voornaam,tussenvoegsel,achternaam,email,geboortedatum);
        vakantiegangers.add(v);
        boolean result = true;
        System.out.println(\"klant toegevoegd\");
    //}
        return result;
    }

}
使用方法addVakantieganger，应将数据添加到arraylist中。但似乎并没有做到这一点，因此应将真实情况报告给表单。 ！heeftVakantieganger（电子邮件）应该检查此人是否已经在数组列表中，但出于测试目的而被禁用 我在日食中收到的错误。 
14:17:03.207 [ERROR] [vakantie_vibes] Uncaught exception escaped

com.google.gwt.event.shared.UmbrellaException: One or more exceptions caught,see full set in UmbrellaException#getCauses
    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:129)
    at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:124)
    at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:116)
    at com.google.gwt.user.client.ui.Widget.onbrowserEvent(Widget.java:172)
    at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1321)
    at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1277)
    at sun.reflect.GeneratedMethodAccessor19.invoke(UnkNown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.Methoddispatch.invoke(Methoddispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:167)
    at com.google.gwt.dev.shell.browserChannelServer.reactToMessagesWhileWaitingForReturn(browserChannelServer.java:326)
    at com.google.gwt.dev.shell.browserChannelServer.invokeJavascript(browserChannelServer.java:207)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:132)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
    at sun.reflect.GeneratedMethodAccessor16.invoke(UnkNown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.Methoddispatch.invoke(Methoddispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:167)
    at com.google.gwt.dev.shell.browserChannelServer.reactToMessages(browserChannelServer.java:281)
    at com.google.gwt.dev.shell.browserChannelServer.processConnection(browserChannelServer.java:531)
    at com.google.gwt.dev.shell.browserChannelServer.run(browserChannelServer.java:352)
    at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.NullPointerException: null
    at com.vakantievibes.client.GUI.FormToevoegenVakantieganger$8.onClick(FormToevoegenVakantieganger.java:153)
    at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:54)
    at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:1)
    at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)
    at com.google.web.bindery.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:193)
    at com.google.web.bindery.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:88)
    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:127)
    at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:124)
    at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:116)
    at com.google.gwt.user.client.ui.Widget.onbrowserEvent(Widget.java:172)
    at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1321)
    at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1277)
    at sun.reflect.GeneratedMethodAccessor19.invoke(UnkNown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.Methoddispatch.invoke(Methoddispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:167)
    at com.google.gwt.dev.shell.browserChannelServer.reactToMessagesWhileWaitingForReturn(browserChannelServer.java:326)
    at com.google.gwt.dev.shell.browserChannelServer.invokeJavascript(browserChannelServer.java:207)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:132)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
    at sun.reflect.GeneratedMethodAccessor16.invoke(UnkNown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.Methoddispatch.invoke(Methoddispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:167)
    at com.google.gwt.dev.shell.browserChannelServer.reactToMessages(browserChannelServer.java:281)
    at com.google.gwt.dev.shell.browserChannelServer.processConnection(browserChannelServer.java:531)
    at com.google.gwt.dev.shell.browserChannelServer.run(browserChannelServer.java:352)
    at java.lang.Thread.run(Thread.java:679)
    

解决方法

        由于使用了所有变量，因此此时只有
VGC
可以是
null
。 但是我怀疑这是一个班级名称。我的第一个猜测是类型“ 3”是服务器API的一部分，而不是客户端API或类似的东西。     ,        您得到
NullPointerException
。发生这种情况是因为您使用的参考是
null
。在您的情况下，这是您标记的行中的字段之一。 使用调试器，在该行上放置一个断点，并检查
null
中的哪个字段。     

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