错误 [TRACE] [rpctest] - 查找入口点类：使用 GWT 使用 Hibernate 将数据插入 MySql

Posted 2023-02-16

【中文标题】错误 [TRACE] [rpctest] - 查找入口点类：使用 GWT 使用 Hibernate 将数据插入 MySql

【英文标题】：ERRORS [TRACE] [rpctest] - Finding entry point classes: using GWT to insert data into MySql using Hibernate

【发布时间】：2011-12-13 17:07:30

【问题描述】：

我正在使用 GWT RPC 和 Hibernate 使用 Eclipse 环境从 mysql 插入和检索数据。我在服务接口中编写了两种方法来从 MySql 中插入和检索数据。

当我实现插入数据的方法时程序运行良好，但当我开始实现从 MySql 检索数据的方法时出现错误。

项目名称是 rpctest 和包名称相同。

这里的项目结构：

rpctest
src
-hibernate.cfg.xml
-user.hbm.xml
-rpctest
   -> Rpctest.gwt.xml
-rpctest.client
   -> Rpctest.java
   -> RpctestService.java
   -> RpctestServiceAsync.java
-rpctest.server
   -> HibernateUtil.java
   -> RpctestServiceImpl.java
-rpctest.shared
   -> FieldVerifier.java
   -> User.java

这是堆栈跟踪：

   [TRACE] [rpctest] - Finding entry point classes
    [ERROR] [rpctest] - Unable to find type 'rpctest.client.Rpctest'
        [ERROR] [rpctest] - Hint: Previous compiler errors may have made this type unavailable
        [ERROR] [rpctest] - Hint: Check the inheritance chain from your module; it may not be inheriting a required module or a module may not be adding its source path entries properly
[ERROR] [rpctest] - Failed to load module 'rpctest' from user agent 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)' at 127.0.0.1:51539

Rpctest.gwt.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <module rename-to='rpctest'>
      <!-- Inherit the core Web Toolkit stuff.                        -->
      <inherits name='com.google.gwt.user.User'/>

      <!-- Inherit the default GWT style sheet.  You can change       -->
      <!-- the theme of your GWT application by uncommenting          -->
      <!-- any one of the following lines.                            -->
      <inherits name='com.google.gwt.user.theme.clean.Clean'/>
      <!-- <inherits name='com.google.gwt.user.theme.standard.Standard'/> -->
      <!-- <inherits name='com.google.gwt.user.theme.chrome.Chrome'/> -->
      <!-- <inherits name='com.google.gwt.user.theme.dark.Dark'/>     -->

      <!-- Other module inherits                                      -->

   <!-- Other module inherits                                      -->

  <!-- Specify the app entry point class.                         -->
  <entry-point class='rpctest.client.Rpctest'/>

  <!-- Specify the paths for translatable code                    -->

  <source path='client'/>  
  <source path='shared'/>

 </module>

服务接口

package rpctest.client;

import java.util.ArrayList;

import rpctest.shared.User;

import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;

@RemoteServiceRelativePath("testService")
public interface RpctestService extends RemoteService 

    public String addUser(String firstName,String lastName) throws IllegalArgumentException;
    public  User[] getUser();

-------

package rpctest.client;

import java.util.ArrayList;

import rpctest.shared.User;
import com.google.gwt.user.client.rpc.AsyncCallback;

public interface RpctestServiceAsync 

    void addUser(String firstName, String lastName,
            AsyncCallback<String> callback);

    void getUser(AsyncCallback<User[]> asyncCallback);

Rpctest.java

package rpctest.client;

import java.util.ArrayList;

import rpctest.shared.User;
import rpctest.shared.FieldVerifier;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.html;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;

import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class Rpctest implements EntryPoint 

    final TextBox firstName = new TextBox();
    final TextBox lastName = new TextBox();
    final Button ans = new Button("Add User");
    //final Label label1 = new Label("First Name");
    //final Label label2 = new Label("Last Name");
    private FlexTable userFlexTable = new FlexTable();
    //final Label errorLabel = new Label();

    private VerticalPanel mainpanel = new VerticalPanel();
    private HorizontalPanel addpanel1 = new HorizontalPanel();
    private HorizontalPanel addpanel2 = new HorizontalPanel();
    private final RpctestServiceAsync calNumbers = GWT
            .create(RpctestService.class);

    /**
     * This is the entry point method.
     */
    public void onModuleLoad() 

        userFlexTable.setText(0, 0, "User ID");
        userFlexTable.setText(0, 1, "First Name");
        userFlexTable.setText(0, 2, "Second Name");
        userFlexTable.setText(0, 3, "Remove");

        //add input boxes to panel
        addpanel1.add(firstName);
        addpanel1.add(lastName);

        firstName.setFocus(true);

        //add input 
        mainpanel.add(userFlexTable);
        mainpanel.add(addpanel1);
        addpanel1.add(ans);

        ans.addClickHandler(new ClickHandler() 
            @Override
            public void onClick(ClickEvent event) 
                        addStock();                 
            
        );

        lastName.addKeyPressHandler(new KeyPressHandler() 
              public void onKeyPress(KeyPressEvent event) 
                  if (event.getCharCode() == KeyCodes.KEY_ENTER) 
                      addStock();
                  
                
              );

        RootPanel.get().add(mainpanel);
    

private void addStock()

        String name1 = firstName.getValue();
        // Stock code must be between 1 and 10 chars that are numbers, letters, or dots.
        /*if (!name1.matches("^[0-9A-Z\\.]1,10$")) 
          Window.alert("'" + name1 + "' is not a valid name.");
          firstName.selectAll();
          return;
        */
         firstName.setValue("");

        String name2 = lastName.getValue();
        /*if (!name2.matches("^[0-9A-Z\\.]1,10$")) 
              Window.alert("'" + name1 + "' is not a valid name.");
              lastName.selectAll();
              return;
            */
        lastName.setValue("");
        firstName.setFocus(true);

        calNumbers.addUser(name1,name2,
            new AsyncCallback<String>() 
            public void onFailure(Throwable caught) 
                // Show the RPC error message to the user
                    Window.alert("check your inputs");
                

            @Override
            public void onSuccess(String result) 
            // TODO Auto-generated method stub
                // Add the user to the table.
                int row = userFlexTable.getRowCount();
                userFlexTable.setText(row, 1, result);
            
        );
    

private void getUser()

       calNumbers.getUser(new AsyncCallback<User[]>() 
            public void onFailure(Throwable caught) 
                // Show the RPC error message to the user
                    Window.alert("Problem in database connection");
                

            @Override
            public void onSuccess(User[] result) 
                // TODO Auto-generated method stub
                Window.alert("i m in getUser!");


            
        );

      

RpctestServiceImpl.java

package rpctest.server;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;
//import com.hib.HibernateUtil;

import org.hibernate.Session;
import org.hibernate.Transaction;
import rpctest.shared.User;
import rpctest.client.RpctestService;

public class RpctestServiceImpl extends RemoteServiceServlet  implements RpctestService 

        public String addUser(String name1, String name2)
            throws IllegalArgumentException 

              Transaction trns = null;
              Session session = HibernateUtil.getSessionFactory().openSession();
              try 
               trns = session.beginTransaction();

               User user = new User();

               user.setFirstName(name1);
               user.setLastName(name2);

               session.save(user);

               session.getTransaction().commit();
               catch (RuntimeException e) 
               if(trns != null)
                trns.rollback();
               
               e.printStackTrace();
               finally
               session.flush();
               session.close();
              

        return name1+name2; // to test flextable entris only 
    

    @Override
    public  User[] getUser()
             

              List<User> getUser = null;

              Transaction trns = null;
              Session session = HibernateUtil.getSessionFactory().openSession();
              try 
               trns = session.beginTransaction();
               getUser = session.createQuery("from User").list();

               //* for (Iterator<User> iter = getUser.iterator(); iter.hasNext();) 
              //
                //User user = iter.next();
                //
              //*             

               trns.commit();
               catch (RuntimeException e) 
               if(trns != null)
                trns.rollback();
               
               e.printStackTrace();
               finally
               session.flush();
               session.close();
             
              return getUser.toArray(new User[getUser.size()]);
        

【参考方案1】：

源元素看起来很可疑，如果您尝试使用：<source path='rpctest/client'/> 和 <source path='hibDomain'/> 会发生什么？

<source path='server'/> 肯定是错的，你不希望你的服务器端代码 gwt 被编译。

【讨论】：

我删除了服务器，并编辑了其他路径变量。它现在引发了更多错误。我编辑了 OP。

使用 'rpctest/client' 与 OP 有相同的错误，即在编辑之前

是的，这绝对是代码组织。请尽量按照推荐的项目布局（服务器、客户端和共享包在同一级别，只有客户端和共享暴露给GWT）：code.google.com/webtoolkit/doc/latest/…

我编辑了代码。删除 hibDomain 文件夹并将 User.java 移动到共享文件夹。现在客户端和共享都暴露给 GWT。我编辑了帖子，请看。错误现在是“找不到入口点类”。

源路径又错了，应该是而不是