Sorting is not working in datatable in PrimeFaces?

Question

Sorting is not working in datatable in PrimeFaces. Please suggest.

See below my .xhtml file

Answer 1

I don't know if it's your case. There's a primefaces issue. A bug on sort of datatable. Take a look here: https://code.google.com/archive/p/primefaces/issues/2476

There are some workarounds:

1. you can use a lazyDataModel for your datatable, it works.

2. you can force the sort order.

In your datatable catch the sort event

In your managed bean you set a order by string to add to your query

private String orderBy = "";

public void sortListener(SortEvent event) {
    String orderColumn = event.getSortColumn().getValueExpression("sortBy").getExpressionString();

    //you will get the content of the attribute SortBy of the column you clicked on, like #{entry.carno}
    orderColumn = orderColumn.replace("#{entry.", "");
    orderColumn = orderColumn.replace("}", "");
    orderBy = " order by " + orderColumn + (event.isAscending()? " asc " : " desc ");
}

public List getList(){
    String query = "[...your query...]" + orderBy;
    ...[execute your query and get your ordered list]
}