Process Composer - node mapping

Question

Hello,
I have a table (ie ID, Name) in my first Web Dynpro application, and i want to pass it to another Web Dynpro application using Process Composer. Everything works fine, when there is only one record (row) in table, but when i add another, click submitt button, error in my log file appears, and process is not delegated to second Web Dynpro application.
I created mapping in xsd, mapped output from 1st application to process context, and input of 2nd application to that context.
Error in log looks like that:
#2.0 #2009 01 28 16:41:13:015#+0100#Error#com.sap.engine.session.data.share.HashtableFactory#
#BC-JAS-COR-SES#kernel.sda#02004C4F4F50C2B00000000000000BE0#21434350000000004#sap.com/tckmcbc.uwl.ui~wd_ui#com.sap.engine.session.data.share.HashtableFactory#userA#41575##5FF4B600ED3711DD850A02004C4F4F50#12abe7e0ed5211ddc4ad02004c4f4f50#12abe7e0ed5211ddc4ad02004c4f4f50#0#Thread[HTTP Worker [@5716384],5,Dedicated_Application_Thread]#Plain##
There is no hashtable registered for java.lang.String class. Maybe there is a classloader problem.#
It seems like i'm trying to map list from 1st application to string into 2nd application or data structure in process context.
Can anyone please tell me how i'm supposed to map one node (table) from one application to another? Is there any pdf/ebook  file about advanced building a composite business process (excpecially how to create xsd file) ?
thanks in advance,
Lukas

Answer 1

Hello,
When I map node from context of 1st application do the node of the 2nd application and check the expression editor for certain attribute of the node there is an error message like:
"xsd:String excepceted ... Found list of String".
In my both web dynpro applications nodes have cardinality 0..n
Do you think there is a problem in my xsd file ?
I also tried to map both nodes directly from one application context to another (not using process context) but i still get this error. Can anyone please help me with this issue.
Here is part of my xsd source file, where i'm trying to create data strucute for process context, to map my node from application (node in my application has only one attribute String):
    <complexType name="myNode">
         <sequence>
              <element ref="tns:myAttribute" />
         </sequence>
    </complexType>
   <complexType name="InvestmentApprovalProcess">
         <sequence>
              <element name="myNode" type="tns:myNode"/>
         </sequence>
    </complexType>
<element name="myAttribute" type="string"/>
Thanks,
Lukasz