David,
Here's a trick I learned by looking at one of Craig's sample JSPs.
In the getAuthorityLevel() method in User bean check if authorityLevel is
null. If it is, return a new instance of it. This should fix the problem
- I think.
For example;
In User.java:
public AuthorityLevel getAuthorityLevel () {
if (authorityLevel == null) {
authorityLevel = new AuthorityLevel();
}
return authorityLevel ;
}
Just an idea. I am curious to find out how others are dealing with this
problem.
HTH!
>-- Original Message --
>Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
>From: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: RE: How to access nested properties which may be null?
>Date: Wed, 1 May 2002 16:41:02 -0700
>
>
>That's sound design advice, and I certainly may end up doing that. I guess
>right now I'm more interested in finding out if there's a Struts way to
do
>this, in order to understand all the facets of Struts better.
>
>Cheers,
>David
>
>-----Original Message-----
>From: Struts Newsgroup [mailto:[EMAIL PROTECTED]]
>Sent: Wednesday, May 01, 2002 3:55 PM
>To: [EMAIL PROTECTED]
>Subject: Re: How to access nested properties which may be null?
>
>Subject: Re: How to access nested properties which may be null?
>From: Vic Cekvenich <[EMAIL PROTECTED]>
> ===
>It might be that you are doing a bit more in JSP than you should.
>More should be done in the model. In action, you should check conditions.
>Vic
>
>[EMAIL PROTECTED] wrote:
>> Hello,
>>
>>
>>
>> How do I use, say, the <bean:write> tag to print out the value of a nested
>> property, if there's a possibility that the parent of the nested property
>> may be Null?
>>
>>
>>
>> I have a User bean with method getAuthorityLevel which returns an instance
>> of the AuthorityLevel bean. The AuthorityLevel bean then has a method
>> getName, which returns a string. I have something like this in my JSP:
>>
>>
>>
>> <bean:write name="myUser" property="authorityLevel.name"/>
>>
>>
>>
>> This works fine if the User bean in the "myUser" variable has an
>> AuthorityLevel, but if it does not then getAuthorityLevel returns Null,
>and
>> Struts then throws a NullPointerException. Is there a simple way around
>> this?
>>
>>
>>
>> Do the "Nested Tags" address this situation?
>>
>>
>>
>> Thanks!
>>
>> David
>>
>>
>>
>> David A. Ventimiglia
>>
>> Wells Fargo Private Client Services
>>
>> (415) 396-0414 (work)
>>
>>
>>
>>
>
>
>
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