Java variable NULL values

[manik_1]

Hi

In my Java value object, some times String variables are coming NULL. That time, in CFM, it's giving undefined error. Please tell me how to solve this.

Regards
Santhosh

[PaulH]

you'll need to test if that cf var exists if you have a java method returning nulls.

if (isDefined("varFromJava"))
varFromJava="";

[manik_1]

Hi,
Thanks for reply.
I have done that. But even though I'm getting error.

I have class in Java like this

class Address{
String address1;
String address2;
}

I'm getting this address object through session.

when I print this object like this I'm getting error

<cfif isdefinied(addressObj1)>

<cfif isdefinied(addressObj1.address1)>
<cfoutput>#addressObj1.address1#
</cfoutput>
</cfif>
Please give me your suggestion.

Thanks
Santhosh
</cfif>

[PaulH]

show how you init the java object in cf.

[mxstu]

Check PaulH's original example and make sure you're spelling the function name correctly IsDefined and that you have used quotes around the variable name

IsDefined("addressObj1")

[manik_1]

I'm getting that Address object through session

Here is the code

<cfset addressObj1 = GetPageContext().getSession.getAttribute("addressV alue")/>

<cfif isdefined(addressObj1)> //This line is working fine.
<cfif isdefined(addressObj1.address1)> // Problem is with this checking. Even
though the address1 is null, it is going inside.
<cfoutput>#addressObj1.address1#
</cfoutput>
</cfif>
</cfif>

[manik_1]

I'm getting that Address object through session

Here is the code

<cfset addressObj1 =
GetPageContext().getSession().getAttribute("addres sValue")/>

<cfif isdefined(addressObj1)> //This line is working fine.
<cfif isdefined(addressObj1.address1)> // Problem is with this checking. Even
though the address1 is null, it is going inside.
<cfoutput>#addressObj1.address1#
</cfoutput>
</cfif>
</cfif>

[PaulH]

as mxstu pointed out, you're missing the quotes in the isDefined() function.

[manik_1]

I'm sorry I have missed quotes here, but in the code we are using that..

I just updated the code

<cfset addressObj1 =
GetPageContext().getSession().getAttribute("addres sValue")/>

<cfif isdefined("addressObj1")> //This line is working fine.
<cfif isdefined("addressObj1.address1")> // Problem is with this checking.
Even though the address1 is null, it is going inside.
<cfoutput>#addressObj1.address1#
</cfoutput>
</cfif>
</cfif>

Please give me suggestion. Where I went wrong

[manik_1]

Hi

I think I got some work around answer. Please let me know, is this correct.

In Data Object, we need to have get and set method for all variables.

class Address{
String address1;
String address2;
public String getAddress1(){
return address1;
}
public void setAddress1(String address1){
this.address1 = address1;
}
public String getAddress2(){
return address1;
}
public void setAddress2(String address2){
this.address2 = address2;
}
}


in the CFM we have to do like this

<cfif isdefined("addressObj1")>
<cfset address1 = addressObj1.getAddress1()/>
<cfif isdefined("address1")>
<cfoutput>#address1#</cfoutput>
</cfif>
</cfif>

This works fine. But my question here is will this hit the performance?

[OldCFer]

You need to understand InDefined(). It means has it been defined, ie set.
Whether it is
null or empty is immaterial. Your code:

<cfif isdefined("addressObj1")>
<cfset address1 = addressObj1.getAddress1()/>
<--- Of course Address1 is defined! You just set (defined) it in he line
above. --->
<cfif isdefined("address1")>
<cfoutput>#address1#</cfoutput>
</cfif>
</cfif>

[PaulH]

larry, actually if addressObj1.getAddress1() is a java object and it spat out a
NULL, address1 would "go south" as far as cf is concerned. if you have cf7, try
that w/javacast("null","") to see what i mean.

[OldCFer]

You're right. I haven't run across that yet, so I shouldn't jump in with both feet.