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 a single MySQL table.
The program is running fine but it is raising this exception.
Exception in thread "UnitCacheLoader" java.lang.RuntimeException: Unable to read from byte cache
at com.google.gwt.dev.util.DiskCache.transferFromStream(DiskCache.java:166)
at com.google.gwt.dev.util.DiskCacheToken.readObject(DiskCacheToken.java:87)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at com.google.gwt.dev.javac.PersistentUnitCache.loadUnitMap(PersistentUnitCache.java:493)
at com.google.gwt.dev.javac.PersistentUnitCache.access$000(PersistentUnitCache.java:92)
at com.google.gwt.dev.javac.PersistentUnitCache$UnitCacheMapLoader.run(PersistentUnitCache.java:122)
Caused by: java.io.StreamCorruptedException: unexpected EOF in middle of data block
at java.io.ObjectInputStream$BlockDataInputStream.refill(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.read(Unknown Source)
at java.io.ObjectInputStream.read(Unknown Source)
at java.io.InputStream.read(Unknown Source)
at com.google.gwt.dev.util.DiskCache.transferFromStream(DiskCache.java:154)
... 16 more
ServiceImpl class:
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()]);
}
}
entrypoint class:
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);
getUser();
}
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);
getUser();
}
});
}
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
for(int i = 0; i < result.length; i ++)
{
//String s = result[i].getFirstName();
int row = userFlexTable.getRowCount();
userFlexTable.setText(row, 0, result[i].getId().toString());
userFlexTable.setText(row, 1, result[i].getFirstName());
userFlexTable.setText(row, 2, result[i].getLastName());
}
}
});
}
}
