How to handle null pointer exception in wicket form submit

Question

I have two textboxes and one submit button in my program.when i provide some inputs and hit the submit button it works fine. When am not entering anything in the textboxes and hit the submit button , it is not working. It throwed the null pointer exception when form submit.

Error is below.

WicketMessage: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component [MarkupContainer [Component id = form1]] threw an exception

    Root cause:

    java.lang.NullPointerException
    at com.usaa.application.pages.HomePage$3.onSubmit(HomePage.java:158)
    at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1518)
    at org.apache.wicket.markup.html.form.Form.process(Form.java:914)
    at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:876)

How to handle this error , please help me ...

Thanks, Kumar

Check whatever you do in your HomePage.java:158 and make sure you don't get a NPE. — bert, Jun 27 '14 at 13:35
Catch the null value in your code? Fix the line 158 that is mentioned in your error. — RossC, Jun 27 '14 at 13:36

score 1 · Answer 1 · answered Jun 27 '14 at 19:01

1

Do this:

Textfield<String> tf1 = new TextField<String>("tf1");
tf1.setConvertEmptyInputStringToNull(false);
form.add(tf1);

The value from the textfield is now an empty string

answered Jun 27 '14 at 19:01

Martin

1,251
11
22

That worked .... after i have added the setconvertemptyinputstringtonull method. – user2949241 Jun 28 '14 at 02:41
Same issue here, this method did nothing for me. – notAChance Apr 06 '16 at 12:37

How to handle null pointer exception in wicket form submit

1 Answers1