Button Submit in Vaadin - button

Question

I am Using Vaadin in my application to display the REPORTS on PAGED TABLE from date to to date.
The code is working fine, when I click the submit button the data is not showing any where on vaadin ui table but, when I click the header row of that table then the data is showing.I need when the user entered from date to to date then after clicking the submit button the I need to display the reports on table instead of clicking the header row.Here I am top display the reports on the table I am using PAGED TABLE instead of normal Table.
I am using this Code for all reports due to this all reports are behaving likesame.
Pls help me here is the code is
Button executeReportButton = new Button("Submit");
executeReportButton.addListener(new Button.ClickListener() {
#Override
public void buttonClick(ClickEvent event) {
if ((Date) tatFromDate.getValue() != null
&& (Date) tatToDate.getValue() != null) {
runDBReport(reportTable, (Date) tatFromDate.getValue(),
(Date) tatToDate.getValue());
} else
showWarningNotification("Error loading check list report.",
"Date entered is not valid.");
}
});
private void runDBReport(PagedTable reportTable, Date fromDate, Date toDate) {
final PagedTable _reportTable = reportTable;
final Date _fromDate = fromDate;
final Date _toDate = toDate;
HibernateUtils.getCurrentSession().doWork(new Work() {
#Override
public void execute(Connection connection) throws SQLException {
String reportCall = "{ call RP_PROC_CHECKLIST_AUDIT(?, ?, ?) }";
CallableStatement stmt = null;
ResultSet rs = null;
try {
stmt = connection.prepareCall(reportCall);
// register the type of the out param - an Oracle specific
// type
stmt.registerOutParameter(3, OracleTypesHelper.INSTANCE
.getOracleCursorTypeSqlType());
// set the in param
stmt.setDate(1, new java.sql.Date(_fromDate.getTime()));
stmt.setDate(2, new java.sql.Date(_toDate.getTime()));
// execute and retrieve the result set
stmt.execute();
rs = (ResultSet) stmt.getObject(3);
// get the results
while (rs.next()) {
Object TATDataRowId = _reportTable.addItem();
_reportTable.getItem(TATDataRowId)
.getItemProperty("checklistid")
.setValue(rs.getString(1));
_reportTable.getItem(TATDataRowId)
.getItemProperty("checklistdescription")
.setValue(rs.getString(2));
// ... a trillion more
}
} catch (Exception e) {
logger.error(
"Error loading check list report. Exception: {}",
e.getMessage());
logger.debug("Error loading check list report.", e);
showWarningNotification(
"Error loading check list report. Please contact admin",
"Error message is : " + e.getMessage());
} finally {
rs.close();
stmt.close();
}
}
});
}

Answer 1

I think that your HibernateUtils.getCurrentSession().doWork(new Work().... is starting a background thread and, when the report is finished fills in the table.
For background threads updating the UI in vaadin, there a special rules on how to do it.
When you don't follow them, then the serverside changes are only visible on the next client->server interaction.
https://vaadin.com/book/vaadin7/-/page/advanced.push.html#advanced.push.running
Don't forget to also look at server push/polling, since the webbrowser must be notified for the new content