ログインアプリケーションを作成しています。ボタンをクリックした後、毎回アンブレラ例外が発生します....根本的な原因を見つけることができません。コードとエラーリストを提供しています。修正を提供してください。GWT-RPCの使用
クライアントサイド 1.VinLog.java
package com.login.vinayak.client;
import com.google.gwt.core.client.EntryPoint;
public class VinLog implements EntryPoint {
private GreetingServiceAsync GreetingService = (GreetingServiceAsync) GWT.create(GreetingService.class);
public void onModuleLoad() {
GWT.setUncaughtExceptionHandler(new UncaughtExceptionHandler() {
public void onUncaughtException(Throwable e) {
Window.alert("uncaught: " +e.getMessage());
Window.alert("uncaught: " + e.getMessage());
String s = buildStackTrace(e, "RuntimeExceotion:\n");
Window.alert(s);
e.printStackTrace();
System.out.println(e.getCause());
}
});
RootPanel rootPanel = RootPanel.get();
SimplePanel simplePanel = new SimplePanel();
rootPanel.add(simplePanel, 0, 0);
simplePanel.setSize("450px", "19px");
Label lblLoginForm = new Label("LOGIN");
lblLoginForm.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
simplePanel.setWidget(lblLoginForm);
lblLoginForm.setSize("544px", "41px");
Label lblUserName = new Label("User Name");
rootPanel.add(lblUserName, 10, 124);
Label lblPassword = new Label("Password");
rootPanel.add(lblPassword, 10, 183);
final TextBox textBox = new TextBox();
textBox.setAlignment(TextAlignment.CENTER);
rootPanel.add(textBox, 112, 114);
textBox.setSize("139px", "18px");
final PasswordTextBox passwordTextBox = new PasswordTextBox();
rootPanel.add(passwordTextBox, 112, 173);
passwordTextBox.setSize("139px", "18px");
Button btnClickToEnter = new Button("Click to Enter");
btnClickToEnter.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
String j=textBox.getText();
String k=passwordTextBox.getText();
GreetingService.loginuser(j, k, new AsyncCallback<String>() {
public void onFailure(Throwable caught) {
Window.alert("welcome");
}
public void onSuccess(String result) {
Window.alert("try again");
}
});
}
});
rootPanel.add(btnClickToEnter, 10, 229);
final ListBox comboBox = new ListBox();
comboBox.addChangeHandler(new ChangeHandler() {
public void onChange(ChangeEvent event) {
Object ob=comboBox.getElement();
if(ob=="Guest") {
Window.alert("Username and Passowrd is: Guest007");
}
}
});
comboBox.addItem("User");
comboBox.addItem("Admin");
comboBox.addItem("Guest");
rootPanel.add(comboBox, 10, 51);
comboBox.setSize("85px", "22px");
Image image = new Image("home.gif");
rootPanel.add(image, 310, 98);
image.setSize("182px", "155px");
}
protected String buildStackTrace(Throwable t, String log) {
if (t != null) {
log += t.getClass().toString();
log += t.getMessage();
StackTraceElement[] stackTrace = t.getStackTrace();
if (stackTrace != null) {
StringBuffer trace = new StringBuffer();
for (int i = 0; i < stackTrace.length; i++) {
trace.append(stackTrace[i].getClassName() + "." + stackTrace[i].getMethodName() + "("
+ stackTrace[i].getFileName() + ":" + stackTrace[i].getLineNumber());
}
log += trace.toString();
}
Throwable cause = t.getCause();
if (cause != null && cause != t) {
log += buildStackTrace(cause, "CausedBy:\n");
}
}
return log;
}
}
2.GreetingService.java
package com.login.vinayak.client;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
@SuppressWarnings("unused")
public interface GreetingService extends RemoteService {
public String loginuser(String username, String password);
}
3.GreetinServiceAsync.java
package com.login.vinayak.client;
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface GreetingServiceAsync {
public void loginuser(String username, String password, AsyncCallback<String> callback);
}
サーバーサイド==>GreetingServiceImpl.java
package com.login.vinayak.server;
import com.login.vinayak.client.GreetingService;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import java.sql.DriverManager;
import java.sql.ResultSet;
import com.google.gwt.dev.generator.ast.Statement;
public class GreetingServiceImpl extends RemoteServiceServlet implements GreetingService{
private static final long serialVersionUID = 1L;
public String loginuser(String username,String password) {
try {
java.sql.Connection con = null;
Class.forName("org.hsqldb.jdbcDriver");
con = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost/", "SA", "");
Statement st=(Statement) con.createStatement();
ResultSet rs=((java.sql.Statement) st).executeQuery("select username,password from lgfrm");
String user=rs.getString(1);
String pass=rs.getString(2);
boolean b1=username.equals(user);
boolean b2= password.equals(pass);
if(b1==b2==true) {
return "success";
}
}
catch (Exception ae) {}
return "Success";
}
}
web.xml
> <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app PUBLIC
> "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
> "http://java.sun.com/dtd/web-app_2_3.dtd">
>
> <web-app> <servlet>
> <servlet-name>GreetingServiceImpl</servlet-name>
> <servlet-class>com.login.vinayak.server.GreetingServiceImpl</servlet-class>
> </servlet> <servlet-mapping>
> <servlet-name>GreetingServiceImpl</servlet-name>
> <url-pattern>/Login</url-pattern> </servlet-mapping> <!-- Default page to serve --> <welcome-file-list>
> <welcome-file>VinLog.html</welcome-file> </welcome-file-list>
>
> </web-app>
エラーリスト
com.google.gwt.event.shared.UmbrellaException：1つ以上の例外がキャッチされました。com.googleのcom.google.gwt.event.shared.HandlerManager.fireEvent（HandlerManager.java:129）のUmbrellaException＃getCausesのフルセットを参照してください。 .gwt.user.client.ui.Widget.fireEvent（Widget.java:129）at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent（DomEvent.java:116）at com.google.gwt.user .client.ui.Widget.onBrowserEvent（Widget.java:177）at com.google.gwt.user.client.DOM.dispatchEventImpl（DOM.java:1351）at com.google.gwt.user.client.DOM.dispatchEvent （DOM.java:1307）at sun.reflect.GeneratedMethodAccessor33.invoke（Unknown Source）at sun.reflect.DelegatingMethodAccessorImpl.invoke（Unknown Source）at java.lang.reflect.Method.invoke（Unknown Source）atcom.google。 gwt.dev.shell.MethodAdaptor.invoke（MethodAdaptor.java：103）com.google.gwt.dev.shell.MethodDispatch.invoke（MethodDispatch.java:71）at com.google.gwt.dev.shell.OophmSessionHandler.invoke（OophmSessionHandler.java:172）at com.google.gwt .dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn（BrowserChannelServer.java:337）at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript（BrowserChannelServer.java:218）at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke （ModuleSpaceOOPHM.java:136）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）atcom.google.gwt.core。 client.impl.Impl。entry0（Impl.java:213）at sun.reflect.GeneratedMethodAccessor31.invoke（Unknown Source）at sun.reflect.DelegatingMethodAccessorImpl.invoke（Unknown Source）at java.lang.reflect.Method.invoke（Unknown Source）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:172）shell.OophmSessionHandler.invoke（OophmSessionHandler.java:172）shell.OophmSessionHandler.invoke（OophmSessionHandler.java:172）
** * ** * ****追加のエラー-原因リスト**** ** * ***
原因：com.google.gwt.user.client.rpc.ServiceDefTarget $ NoServiceEntryPointSpecifiedException：サービス実装URLがcom.google.gwt.user.client.rpc.impl.RemoteServiceProxy.doPrepareRequestBuilderImpl（RemoteServiceProxy.java:430）で指定されていませんcom.google.gwt.user.client.rpc.impl.RemoteServiceProxy $ ServiceHelper.finish（RemoteServiceProxy.java:74）のcom.google.gwt.user.client.rpc.impl.RemoteServiceProxy.doInvoke（RemoteServiceProxy.java:368） ）com.login.vinayak.client.GreetingService_Proxy.loginuser（GreetingService_Proxy.java:34）at com.login.vinayak.client.VinLog $ 2.onClick（VinLog.java:82）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.EventBus.dispatchEvent（EventBus.java:40）at com.google.web.bindery.event.shared.SimpleEventBus.doFire（SimpleEventBus.java:193） com.google.web.bindery.event.shared.SimpleEventBus.fireEvent（SimpleEventBus.java:88）at com.google.gwt.event.shared.HandlerManager.fireEvent（HandlerManager.java:127）
親切に修正を提供してください...TY