GWT 设计器不工作
GWT Designer doesn't work
我正在使用：
Eclipse 开普勒 4.3
JDK 7
GWT 与 eclipse 4.3 兼容（通过市场下载）
GWT 版本默认通过 GWT 2.6.0 通过市场下载
在 Eclipse 上，java 编译器版本是 1.7
不是maven项目
当我尝试打开 GWT 入口点 class（即 UI）时，它会抛出以下错误：
入口点class（创建新GWT项目时eclipse默认创建）：
package xsdf.com.client;
import xsdf.com.shared.FieldVerifier;
/**
* Entry point classes define <code>onModuleLoad()</code>.
*/
public class Xxwa implements EntryPoint {
/**
* The message displayed to the user when the server cannot be reached or
* returns an error.
*/
private static final String SERVER_ERROR = "An error occurred while "
+ "attempting to contact the server. Please check your network "
+ "connection and try again.";
/**
* Create a remote service proxy to talk to the server-side Greeting service.
*/
private final GreetingServiceAsync greetingService = GWT
.create(GreetingService.class);
/**
* This is the entry point method.
*/
public void onModuleLoad() {
final Button sendButton = new Button("Send");
final TextBox nameField = new TextBox();
nameField.setText("GWT User");
final Label errorLabel = new Label();
// We can add style names to widgets
sendButton.addStyleName("sendButton");
// Add the nameField and sendButton to the RootPanel
// Use RootPanel.get() to get the entire body element
RootPanel.get("nameFieldContainer").add(nameField);
RootPanel.get("sendButtonContainer").add(sendButton);
RootPanel.get("errorLabelContainer").add(errorLabel);
// Focus the cursor on the name field when the app loads
nameField.setFocus(true);
nameField.selectAll();
// Create the popup dialog box
final DialogBox dialogBox = new DialogBox();
dialogBox.setText("Remote Procedure Call");
dialogBox.setAnimationEnabled(true);
final Button closeButton = new Button("Close");
// We can set the id of a widget by accessing its Element
closeButton.getElement().setId("closeButton");
final Label textToServerLabel = new Label();
final HTML serverResponseLabel = new HTML();
VerticalPanel dialogVPanel = new VerticalPanel();
dialogVPanel.addStyleName("dialogVPanel");
dialogVPanel.add(new HTML("<b>Sending name to the server:</b>"));
dialogVPanel.add(textToServerLabel);
dialogVPanel.add(new HTML("<br><b>Server replies:</b>"));
dialogVPanel.add(serverResponseLabel);
dialogVPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT);
dialogVPanel.add(closeButton);
dialogBox.setWidget(dialogVPanel);
// Add a handler to close the DialogBox
closeButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
dialogBox.hide();
sendButton.setEnabled(true);
sendButton.setFocus(true);
}
});
// Create a handler for the sendButton and nameField
class MyHandler implements ClickHandler, KeyUpHandler {
/**
* Fired when the user clicks on the sendButton.
*/
public void onClick(ClickEvent event) {
sendNameToServer();
}
/**
* Fired when the user types in the nameField.
*/
public void onKeyUp(KeyUpEvent event) {
if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {
sendNameToServer();
}
}
/**
* Send the name from the nameField to the server and wait for a response.
*/
private void sendNameToServer() {
// First, we validate the input.
errorLabel.setText("");
String textToServer = nameField.getText();
if (!FieldVerifier.isValidName(textToServer)) {
errorLabel.setText("Please enter at least four characters");
return;
}
// Then, we send the input to the server.
sendButton.setEnabled(false);
textToServerLabel.setText(textToServer);
serverResponseLabel.setText("");
greetingService.greetServer(textToServer,
new AsyncCallback<String>() {
public void onFailure(Throwable caught) {
// Show the RPC error message to the user
dialogBox
.setText("Remote Procedure Call - Failure");
serverResponseLabel
.addStyleName("serverResponseLabelError");
serverResponseLabel.setHTML(SERVER_ERROR);
dialogBox.center();
closeButton.setFocus(true);
}
public void onSuccess(String result) {
dialogBox.setText("Remote Procedure Call");
serverResponseLabel
.removeStyleName("serverResponseLabelError");
serverResponseLabel.setHTML(result);
dialogBox.center();
closeButton.setFocus(true);
}
});
}
}
// Add a handler to send the name to the server
MyHandler handler = new MyHandler();
sendButton.addClickHandler(handler);
nameField.addKeyUpHandler(handler);
}
}
使用GWT Designer打开上面class时出现的错误：
Internal Error
encountered unexpected internal error.
This could be caused by a bug or by a misconfiguration issue, conflict, partial update, etc.
java.lang.NoSuchMethodError: com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(Lcom/google/gwt/core/ext/TreeLogger;Ljava/lang/String;Z)Lcom/google/gwt/dev/cfg/ModuleDef;
Show stack trace.
Hide stack trace.
Stack trace:
java.lang.NoSuchMethodError: com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(Lcom/google/gwt/core/ext/TreeLogger;Ljava/lang/String;Z)Lcom/google/gwt/dev/cfg/ModuleDef;
at com.google.gwt.dev.shell.designtime.HostedModeSupportImpl.loadModule(HostedModeSupportImpl.java:85)
at com.google.gwt.dev.shell.designtime.HostedModeSupportImpl.createModuleSpaceHost(HostedModeSupportImpl.java:64)
at sun.reflect.NativeMetho
我已经检查了可能存在的问题：
使用GWT Designer遇到NoSuchMethodError或NoClassDefFoundError怎么办？
https://developers.google.com/web-toolkit/tools/gwtdesigner/faq#NoSuchMethodError
我已经尝试过不同的 vms，1.8、1.6；
GWT Designer 仍然是 ative 吗？是设计UI更好的选择？
如何更正此错误并使 GWT Designer 正常工作？
GWT Designer 无人维护。它不适用于 GWT 2.6.0 或 2.7，并且可能不适用于较新的版本。虽然它确实适用于 2.6.1，但我不建议使用最新版本以外的任何其他版本，特别是 "classic" DevMode 也被弃用：2.7 是 SuperDevMode 真正可用的第一个版本，它将在接下来的版本中继续改进。
我正在使用：
Eclipse 开普勒 4.3 JDK 7 GWT 与 eclipse 4.3 兼容（通过市场下载） GWT 版本默认通过 GWT 2.6.0 通过市场下载 在 Eclipse 上，java 编译器版本是 1.7 不是maven项目
当我尝试打开 GWT 入口点 class（即 UI）时，它会抛出以下错误：
入口点class（创建新GWT项目时eclipse默认创建）：
package xsdf.com.client;
import xsdf.com.shared.FieldVerifier;
/**
* Entry point classes define <code>onModuleLoad()</code>.
*/
public class Xxwa implements EntryPoint {
/**
* The message displayed to the user when the server cannot be reached or
* returns an error.
*/
private static final String SERVER_ERROR = "An error occurred while "
+ "attempting to contact the server. Please check your network "
+ "connection and try again.";
/**
* Create a remote service proxy to talk to the server-side Greeting service.
*/
private final GreetingServiceAsync greetingService = GWT
.create(GreetingService.class);
/**
* This is the entry point method.
*/
public void onModuleLoad() {
final Button sendButton = new Button("Send");
final TextBox nameField = new TextBox();
nameField.setText("GWT User");
final Label errorLabel = new Label();
// We can add style names to widgets
sendButton.addStyleName("sendButton");
// Add the nameField and sendButton to the RootPanel
// Use RootPanel.get() to get the entire body element
RootPanel.get("nameFieldContainer").add(nameField);
RootPanel.get("sendButtonContainer").add(sendButton);
RootPanel.get("errorLabelContainer").add(errorLabel);
// Focus the cursor on the name field when the app loads
nameField.setFocus(true);
nameField.selectAll();
// Create the popup dialog box
final DialogBox dialogBox = new DialogBox();
dialogBox.setText("Remote Procedure Call");
dialogBox.setAnimationEnabled(true);
final Button closeButton = new Button("Close");
// We can set the id of a widget by accessing its Element
closeButton.getElement().setId("closeButton");
final Label textToServerLabel = new Label();
final HTML serverResponseLabel = new HTML();
VerticalPanel dialogVPanel = new VerticalPanel();
dialogVPanel.addStyleName("dialogVPanel");
dialogVPanel.add(new HTML("<b>Sending name to the server:</b>"));
dialogVPanel.add(textToServerLabel);
dialogVPanel.add(new HTML("<br><b>Server replies:</b>"));
dialogVPanel.add(serverResponseLabel);
dialogVPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT);
dialogVPanel.add(closeButton);
dialogBox.setWidget(dialogVPanel);
// Add a handler to close the DialogBox
closeButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
dialogBox.hide();
sendButton.setEnabled(true);
sendButton.setFocus(true);
}
});
// Create a handler for the sendButton and nameField
class MyHandler implements ClickHandler, KeyUpHandler {
/**
* Fired when the user clicks on the sendButton.
*/
public void onClick(ClickEvent event) {
sendNameToServer();
}
/**
* Fired when the user types in the nameField.
*/
public void onKeyUp(KeyUpEvent event) {
if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {
sendNameToServer();
}
}
/**
* Send the name from the nameField to the server and wait for a response.
*/
private void sendNameToServer() {
// First, we validate the input.
errorLabel.setText("");
String textToServer = nameField.getText();
if (!FieldVerifier.isValidName(textToServer)) {
errorLabel.setText("Please enter at least four characters");
return;
}
// Then, we send the input to the server.
sendButton.setEnabled(false);
textToServerLabel.setText(textToServer);
serverResponseLabel.setText("");
greetingService.greetServer(textToServer,
new AsyncCallback<String>() {
public void onFailure(Throwable caught) {
// Show the RPC error message to the user
dialogBox
.setText("Remote Procedure Call - Failure");
serverResponseLabel
.addStyleName("serverResponseLabelError");
serverResponseLabel.setHTML(SERVER_ERROR);
dialogBox.center();
closeButton.setFocus(true);
}
public void onSuccess(String result) {
dialogBox.setText("Remote Procedure Call");
serverResponseLabel
.removeStyleName("serverResponseLabelError");
serverResponseLabel.setHTML(result);
dialogBox.center();
closeButton.setFocus(true);
}
});
}
}
// Add a handler to send the name to the server
MyHandler handler = new MyHandler();
sendButton.addClickHandler(handler);
nameField.addKeyUpHandler(handler);
}
}
使用GWT Designer打开上面class时出现的错误：
Internal Error
encountered unexpected internal error.
This could be caused by a bug or by a misconfiguration issue, conflict, partial update, etc.
java.lang.NoSuchMethodError: com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(Lcom/google/gwt/core/ext/TreeLogger;Ljava/lang/String;Z)Lcom/google/gwt/dev/cfg/ModuleDef;
Show stack trace.
Hide stack trace.
Stack trace:
java.lang.NoSuchMethodError: com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(Lcom/google/gwt/core/ext/TreeLogger;Ljava/lang/String;Z)Lcom/google/gwt/dev/cfg/ModuleDef;
at com.google.gwt.dev.shell.designtime.HostedModeSupportImpl.loadModule(HostedModeSupportImpl.java:85)
at com.google.gwt.dev.shell.designtime.HostedModeSupportImpl.createModuleSpaceHost(HostedModeSupportImpl.java:64)
at sun.reflect.NativeMetho
我已经检查了可能存在的问题：
使用GWT Designer遇到NoSuchMethodError或NoClassDefFoundError怎么办？
https://developers.google.com/web-toolkit/tools/gwtdesigner/faq#NoSuchMethodError
我已经尝试过不同的 vms，1.8、1.6；
GWT Designer 仍然是 ative 吗？是设计UI更好的选择？ 如何更正此错误并使 GWT Designer 正常工作？
GWT Designer 无人维护。它不适用于 GWT 2.6.0 或 2.7，并且可能不适用于较新的版本。虽然它确实适用于 2.6.1，但我不建议使用最新版本以外的任何其他版本，特别是 "classic" DevMode 也被弃用：2.7 是 SuperDevMode 真正可用的第一个版本，它将在接下来的版本中继续改进。