Vinay | Techartifact

August 15, 2013September 20, 2013

Get current date, time , timestamp in Java

You can get the current date time via following two classes – Date and Calendar. And, later use SimpleDateFormat class to convert the date into user friendly format.

-> Date() + SimpleDateFormat()

DateFormat dateFormat = new SimpleDateFormat("dd-MMM-yy HH:mm:ss");
Date date = new Date();
System.out.println(dateFormat.format(date));

-> get the time

Date date = new Date();
System.out.println(date.getTime());

-> get the time stamp

Date date = new Date();
System.out.println(new Timestamp(date.getTime()));

You can define various format i.e

-> dd-MMM-yy HH:mm:ss
-> yyyy/MM/dd HH:mm:ss
-> yy/MM/dd HH:mm:ss

You can use as working code like

import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
 
 
public class GetCurrentDateTime {
  public static void main(String[] args) {
 
	   DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
	   //get current date time with Date()
	   Date date = new Date();
	   System.out.println(dateFormat.format(date));
            
           //get the time
           Date date = new Date();
	   System.out.println(new Timestamp(date.getTime()));

           // get the timestamp
 
  }
}

August 9, 2013August 9, 2013

Dynamic Creation of cascading Lov in oracle ADF or model driven Lov in Oracle ADF.

Requirement – I am working on tricky requirement where i have two child component and one child LOV.How to do that?

Solution- Well if you have working knowledge of cascading LOV in then we pass bind parameter of parent LOV attribute in child LOV View Accessor(VA) . But in this scenario , we have two master LOV. then we will be doing by passing through managed bean, using Application module session .

What i have done.I have used HR schema .

I have 3 view object. one as country table of HR schema.One View object for location table.One view which have all transient attribute and consider to be main view object.

As i found this approach in Jobinesh’s blog- i write a custom method in applicationModuleImpl.java as below –

    public void setLocationIDSessionData(String locId){
          System.out.println("hello 232323&&&"+locId);
        this.getSession().getUserData().put("LocationId", locId);
        
      }

I have getUserData method of applicationModule interface which returns a java.util.Hashtable which may be used to store user specific context that is related to this application session.

Read all other method related to this
http://docs.oracle.com/cd/E12839_01/apirefs.1111/e10653/oracle/jbo/ApplicationModuleHandle.html

Ok, coming back to this requirement – I used a managed bean in backing bean scope where i executed the binding of applicationModuleImpl custom method as below –

    public void executec(String valueChangeEvent) {
    BindingContext bctx = BindingContext.getCurrent();
           BindingContainer bindings = bctx.getCurrentBindingsEntry();
           OperationBinding op =
               (OperationBinding)bindings.getOperationBinding("setLocationIDSessionData");
           op.getParamsMap().put("locId",valueChangeEvent);
           op.execute();
    }

Here we are passing the value of both LOV to locationId to custom applicationModuleImpl method.In both parent LOV , i create valuechangeEvent method , which get the current selected countryId and pass to custom applicationModuleImpl method. that is below –

    public void VC(ValueChangeEvent valueChangeEvent) {
      System.out.println("hello &&&"+valueChangeEvent.getNewValue());
      
       
        executec(valueChangeEvent.getNewValue().toString());
    }

    public void vc2(ValueChangeEvent valueChangeEvent) {
        System.out.println("hello &&&34343"+valueChangeEvent.getNewValue());
        executec(valueChangeEvent.getNewValue().toString());
    }

Now we have final task, we have to set the value of child lov bind parameter in child View Accessor as adf.userSession.userData.LocationId –

That’s it.now we will run the jspx , which have all 3 lov.2 parent and one child LOV.
for displaying LOV , we need to click on create button.after click you can see all 3 LOVs.

After selecting county as CH from countryLov1 , we will see different values in location ID.

Now we will select country as IN from countryLov2 , we will see different values in location ID.

You can download the sample application here.

ModelDrivernCascadingLOVs

Happy coding with Vinay kumar in techartifact….

August 7, 2013May 9, 2014

ADF_FACES-30107: The view state of the page has expired. Load the page again.

Requirment- Resolving ADF_FACES-30107: The view state of the page has expired. Load the page again.
ugly error actually.- you don’t know what went wrong- and you will see a very long error message like
ADF_FACES-30107: The view state of the page has expired. Load the page again………………………………………………………………………..

What’s the problemFirst understand , why we get this error – The ViewExpiredException will be thrown whenever the javax.faces.STATE_SAVING_METHOD is set to server (default) and the enduser sends a HTTP POST request using or or some valueChangeEvent on a view, while the associated view state isn’t available in the session anymore. The view state is identified by a hidden input field javax.faces.ViewState of the

In the oracle documentation this error states-

ADF_FACES-30107: The view state of the page has expired. Reload the page.
Cause: The UI state of the view has expired, either because the back button has been used too many times, too many page submissions have occurred on ther pages, or because of an underlying bug in the view code.
Action: The application using ADF should install an ADFc error handler for JSF ViewExpiredExceptions, or configure the org.apache.myfaces.trinidad.CLIENT_STATE_MAX_TOKENS web.xml parameter to a larger value.
Level: 2

Type: ERROR

Impact: Logging

How to resolve this – Find for the org.apache.myfaces.trinidad.CLIENT_STATE_MAX_TOKENS in web.xml as context parameter . If it not set as it happened to my application. Set this parameter and put value.Sometimes,it will not work for value for 15 to 20. I set it as 500.This mean , it can handle this much page submission for the pages.

Great.After reading this ,you resolved the error.

Happy coding with Vinay kumar in techartifact……