gwt编译器找不到入口点类

Question

i'm trying to run a gwt application which is giving me this errors.

[ERROR] [studentsystem2] - Unable to find type 'com.example.studentsystem2.client.StudentSystem2'
[ERROR] [studentsystem2] - Unable to find type 'com.example.studentsystem2.client.StudentSystem2'
[ERROR] [studentsystem2] - Unable to find type 'com.example.studentsystem2.client.StudentSystem2'
[ERROR] [studentsystem2] - Unable to find type 'com.example.studentsystem2.client.StudentSystem2'
[ERROR] [studentsystem2] - Unable to find type 'com.example.studentsystem2.client.StudentSystem2'

What should i have to do?

here is my classes and xml files.

StudentSystem2.gwt.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.5.1//EN"
  "http://google-web-toolkit.googlecode.com/svn/tags/2.5.1/distro-source/core/src/gwt-module.dtd">
<module rename-to='studentsystem2'>
  <inherits name='com.google.gwt.user.User'/>
  <inherits name='com.google.gwt.user.theme.clean.Clean'/>
  <entry-point class='com.example.studentsystem2.client.StudentSystem2'/>
  <source path='client'/>
  <source path='shared'/>
</module>

StudentSystem2.java

package com.example.studentsystem2.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;


public class StudentSystem2 implements EntryPoint {

    public void onModuleLoad() {

        RootPanel.get().add(new Enter());

    }
}

Here is the Enter.java code.

package com.example.studentsystem2.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HasText;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.Widget;

public class Enter extends Composite implements HasText {

    private static EnterUiBinder uiBinder = GWT.create(EnterUiBinder.class);
    @UiField Label SId;
    @UiField Label name;
    @UiField Label department;
    @UiField Button addButton;
    @UiField Label label;
    @UiField TextBox IdTextField;
    @UiField TextBox nameTextField;
    @UiField TextBox departmentTextField;




    interface EnterUiBinder extends UiBinder<Widget, Enter> {
    }

    public Enter() {
        initWidget(uiBinder.createAndBindUi(this));
    }

    public Enter(String firstName) {
        initWidget(uiBinder.createAndBindUi(this));
        addButton.setText(firstName);
    }

    public void setText(String text) {
        addButton.setText(text);
    }

    public String getText() {
        return addButton.getText();
    }


    @UiHandler("label")
    void onLabelClick(ClickEvent event) {

    }
    @UiHandler("addButton")
    void onAddButtonClick(ClickEvent event) {




    }
}

and the Enter.ui.xml file

<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent">
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
    xmlns:g="urn:import:com.google.gwt.user.client.ui">
    <ui:style>
    .important {
        font-weight: bold;
    }
    </ui:style>
    <g:HTMLPanel>
        <g:AbsolutePanel height="377px">
            <g:at left="10" top="48">
                <g:Label text="StudentId" ui:field="SId"/>
            </g:at>
            <g:at left="10" top="117">
                <g:Label text="Name" ui:field="name"/>
            </g:at>
            <g:at left="10" top="190">
                <g:Label text="Department" ui:field="department"/>
            </g:at>
            <g:at left="128" top="32">
                <g:TextBox ui:field="IdTextField"/>
            </g:at>
            <g:at left="128" top="101">
                <g:TextBox ui:field="nameTextField"/>
            </g:at>
            <g:at left="128" top="174">
                <g:TextBox ui:field="departmentTextField"/>
            </g:at>
            <g:at left="172" top="237">
                <g:Button width="101px" height="30px" text="Add" ui:field="addButton"/>
            </g:at>
            <g:at left="17" top="287">
                <g:Label text="See Students" ui:field="label"/>
            </g:at>
        </g:AbsolutePanel>
    </g:HTMLPanel>
</ui:UiBinder> 

Answer 1

Did you change your project/package name since you created the project? If so, make sure the new name matches the one in the "GWT Compile" window, and the "Run" window.

Also make sure your Project's directory structure looks like the one in the image:

If you did change the name, you should delete the old compiled output in the war/<old project name> directory.