Java Mapping

[Former Member]

Hello

I m trying to lookup a bean in the Java Mapping.I would like to know about the three options that we get while creating a user defined function in JavaMapping.

In the Context type we get a ResultList parameter.I feel this is the output parameter of function.If i m right, i would like to know how to set the value in this result para.

I tried with the following code:-

<b>result.addValue(<string>);</b>

while testing - Function executes without any error.But the output field is still blank.

Any Idea what i m missing out?

Regards

DhanyaR Nair

[Former Member · Accepted solution]

Dhanya,

Java mapping has nothing to do with "result.addValue(<string>);"

>>result.addValue(<string>); is something that you use in java function in message mapping and not on java mapping. in java mapping there is nothing link context change of ResultList. All you have is input stream and output stream where you had to parse the xml to produce output stream depending upon the output you need!

I hope you might find my answer helpful.

regards,

Felix

[Andrzej_Filusz]

Hi!!!

Here is a very simple example:

Message 1:

AddValue 1..1

___list 1..unbounded

______value 1..1 xsd:string

Message 2:

DstValue 1..1

___list 1..unbounded

______dstValue 1..1 xsd:string

Message mapping:

list --> list

value --> addValueTest --> dstValue

Function:

public void addValueTest(String[] a, ResultList, Container container) {

___for (int i = 0; i < a.length; i++)

______result.addValue(a<i> + "plus");

}

Test:

Source message:

AddValue

___list

______value "aaa"

___list

______value "bbb"

Target message:

DstValue

___list

______dstValue "aaaplus"

___list

______dstValue "bbbplus"

I hope this will help you.

Regards,

Andrzej

[Former Member]

<b>Thanks for the response frndz.

My scenario is to pass two input para to a bean ,which returns the String[][] as output.

I just need to pass these values to result field of user defined function.</b>

<u>Code i used:</u>

public void testQueue(String[] a,String[] b,ResultList result,Container container){

<....bean lookup code...>

String[][] iresult = mapping.getInstance( a[0] , b[0] );

result.addValue(iresult[0][0]);

<b>I m getting Null pointer exception here.

I tried the same code from a simple java client and its giving proper response.

Any idea to resolve this. I m not getting the reason for null pointer exception as

iresult[0][0] gives "<abc>" from java client

and null pointer excep from XI function.

Any idea?

Regards

DhanyaR Nair</b>

[Former Member]

Dhanya,

Your bean might end up throwing Nested Exception in XI if it doesn't follow the ejb specifications in WebAs 640. Please check that. Make sure you use try catch in your bean and catch every exception individually and not Exception as a whole!

I am confident this might solve your problem.

regards,

Felix

[Former Member]

Hi Felix

Thanks for suggestion.I tried with adding individual catch blocks in the ejb,but still facing the same exception in XI.

I feel if there is any probs with Ejb ,it should reflect the exception while calling from java client too.But here the case is strange.

I m still confused with the null ptr exception.Is there any way to resolve this.If i hard code any string it reflects in the output.

But the value returned from the bean is been reflected as null.How can i test whats the value in iresult.

I tried the trace stmts, but got caught in same Null Ptr excep.Need ur valuable inputs .

Regards

DhanyaR Nair

[Andrzej_Filusz]

Hi!!!

You say that your code works perfect outside XI environment. So I suppose there aren't any bugs in coding.

My advise:

Try to find out which part of your code causes an exception. Use try/catch statements.

Check if EVERY object is not null before you invoke any method on it, for example:

if (mapping != null)

___ mapping.method(parameters);

else

throw new RuntimeException("mapping is null");

In this way you will find out where is the problem.

Regards,

Andrzej

[Andrzej_Filusz]

Hi!!!

You say that your code works perfect outside XI environment. So I suppose there aren't any bugs in coding.

My advise:

Try to find out which part of your code causes an exception. Use try/catch statements.

Check if EVERY object is not null before you invoke any method on it, for example:

if (mapping != null)

___ mapping.method(parameters);

else

throw new RuntimeException("mapping is null");

In this way you will find out where is the problem.

Regards,

Andrzej

[Former Member]

Hi Andrzej

Thats really a nice way to trace exception. I found that the <b>iresult</b> is null i.e

<u>Code:</u>

<i> Object obj = ctx.lookup("MAPPINGLOOKUP");

HomeObj = (CCSMappingLookupHome) obj;

mapping = HomeObj.create();

if ( mapping != null)

{

iresult = mapping.getInstance( a[0] , b[0] );

}

else

throw new RuntimeException("mapping is null");

if ( <b>iresult</b> != null){

result.addValue(<b>iresult</b>[0][0]);}

else

throw new RuntimeException("iresult is null");</i>

But why its not working in XI. Java gives proper response.

Any Other idea?

Thanks In Advance

DhanyaR Nair