I am using GWT RPC & Hibernate to insert and retrieve data from MySql using eclipse environment. I have written two methods in service interfaces to insert & retrieve data from MySql.
The program is running fine when I implemented method to insert data but is raising errors when I started implementing method to retrieve data from MySql.
Name of project is rpctest & same is name of package.
Here structure of project:
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
Here is stack trace:
[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>
Service interfaces
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()]);
}
}
source element looks fishy, what happens if you try with:
<source path='rpctest/client'/>and<source path='hibDomain'/>?<source path='server'/>is definitely wrong, you don’t want your server-side code gwt compiled.