How to check empty idoc fields in user defined function

Dear All,
I am working on an IDOC to file scenario. In my user defined function, I want to check whether a particular field of the idoc is populated. I can perform this test in message mapping by comparing the field with an empty constant.
How can I do the same test in an advanced user defined function? I have tried all the following, but none has worked so far
If (a.length == 0) .
If (a[0].length == 0)
If (a[0] == )
If (a[0] == )
Am I doing something wrong?
Thx/Farshad

To check whether an element is not available:
if (a.length == 0)
but you have to set cache to context. If you set cache to queue, it will not work, as in this case the context changes are part of the array a.
To check whether an element is empty:
if (a[0].equals(""))
Regards
Stefan
Message was edited by: Stefan Grube
Message was edited by: Stefan Grube

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package com.bea.wlevs.example.FunctionCEP;
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import com.bea.wlevs.event.example.FunctionCEP.TestEvent;
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<?xml version="1.0" encoding="UTF-8"?>
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Invalid statement: "select >>sum_fxn<<(num_1,num_2),age from inputStream"
Description: Invalid call to function or constructor: sum_fxn
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the wrong type., or Error while handling member access to complex type. Constructor sum_fxn of type
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Constructor sum_fxn of type sum_fxn not found.
Action: Verify function or constructor for complex type exists, is not ambiguous, and has the correct
number of parameters.
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Hi,
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