[Springframework-developer] Custom Editor

[Shishir K. S. <sk...@sy...>]

Hello,=20

I have a simple form=20
----------------------------------------
public class TestForm  {

    private Boolean testBoolean;  =20
    private String[] arrayOne;
    private String[] arrayTwo;
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    public TestForm() {}
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    public String[] getArrayOne() {
        return this.arrayOne;
    }

    public void setArrayOne(String[] arrayOne) {
        this.arrayOne =3D arrayOne;
    }

    public String[] getArrayTwo() {
        return this.arrayTwo;
    }

    public void setArrayTwo(String[] arrayTwo) {
        this.arrayTwo =3D arrayTwo;
    }

    public Boolean getTestBoolean() {
        return this.testBoolean;
    }

    public void setTestBoolean(Boolean testBoolean) {
        this.testBoolean =3D testBoolean;
    }
}
---------------------------------------------

And my test case is :

---------------------------------------------

public void testBindWithInitializer() throws ServletException {
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        ServletContext sc =3D new MockServletContext();
        MockHttpServletRequest request =3D new =
MockHttpServletRequest(sc);
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        request.addParameter("testBoolean", "true");
        request.addParameter("arrayTwo", "arraytwo_1,arraytwo_2");

        TestForm form =3D new TestForm();
        Errors errors =3D BindUtils.bind(request,form, "form", new
BindInitializer() {
            public void initBinder(ServletRequest request,
ServletRequestDataBinder binder) {
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binder.registerCustomEditor(String[].class,"arrayTwo",new
StringArrayPropertyEditor());
            }
        });
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        assertTrue("arraytwo length", form.getArrayTwo().length =3D=3D =
2);
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    }
--------------------------------------------------------

I am trying to add a custom editor for a particular attribute by
specifying the attributeName "arrayTwo" on the registerCustomBinder

However, I get the following error:

Testcase: testBindWithInitializer took 0.12 sec
	Caused an ERROR
Invalid property 'arrayTwo[0]' of bean class [com.test.TestForm]: Cannot
access indexed value of property referenced in indexed property path
'arrayTwo[0]': returned null
org.springframework.beans.NullValueInNestedPathException: Invalid
property 'arrayTwo[0]' of bean class [com.test.TestForm]: Cannot access
indexed value of property referenced in indexed property path
'arrayTwo[0]': returned null
	at
org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperIm
pl.java:499)
	at
org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperIm
pl.java:484)
	at
org.springframework.beans.BeanWrapperImpl.getPropertyType(BeanWrapperImp
l.java:917)
	at
org.springframework.validation.BindException.resolveMessageCodes(BindExc
eption.java:162)
	at
org.springframework.validation.DataBinder.bind(DataBinder.java:229)
	at
org.springframework.web.bind.ServletRequestDataBinder.bind(ServletReques
tDataBinder.java:92)
	at
org.springframework.web.bind.BindUtils.bind(BindUtils.java:65)
	at com.test.TestMail.testBindWithInitializer(TestMail.java:82)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
	at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
	at
junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
	at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
	at junit.extensions.TestSetup.run(TestSetup.java:23)
	at
org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAnt
Runner.java:377)
	at
org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAn
tRunner.java:135)


It works fine (as expected) if I remove the attribute. Am I doing
something wrong/missing something ?

Thanks
Shishir=20