BC4J send messaging adapter gets JMS exception

Question

Running a 9i standalone application based on BC4J. The following code is trying to send a single VO to an 8i queue. Note: prior to entering this routine, I have already called the .writeXML() method on the same VO and looked at the text and the XML all looks great.
AdapterMessage[] msgs = new AdapterMessage[1];
try {
// set up queue connection
msgs[0] = AdapterMessage.newViewObjectMessage( vo );
sendMessage( msgs );
public void sendMessage( AdapterMessage[] messages)
try
ApplicationModule am = QWsetup.ApplicationModule();
BC4JSendingAdapter adapter = new BC4JSendingAdapter();
adapter.setShowTrace(true);
adapter.sendMessage( am, messages);
catch(AdapterFailureException e)
System.err.println("sendMessage error: "+e.getMessage()+"\n"+
e.getOriginalException());
e.printStackTrace();
I step into the adapter.sendMessage line and get the following in my message window...
[2] Creating JDBC Connection...
[3] oracle.jdbc.driver.OracleDriver
[4] jdbc:oracle:thin:@pgia05.pginw.com:1521:qmpgit
[5] Creating Topic Connection...
[6] Creating Topic Session...
[7] Creating Topic...
[8] Publishing message...
[9] Done.
sendMessage error: JMS exception while processing message
java.lang.NullPointerException

Answer 1

Hi Roger,
I've been looking into your error message: JMS Exception while processing message.
I was able to reproduce this error message. In my case I was trying to send a BESAdapter message without setting its mandatory properties. My code was:
BESAdapterMessage a = (BESAdapterMessage)BESAdapterMessage.newViewObjectMessage(empvo);
BESAdapterMessage[] messages = new BESAdapterMessage[] {a};
try
am.sendMessage(messages);
There are two mandatory properies of the adapter that must be set that I forgot. I found the answer in the help. If you do a search for BESAdapterMessage you will find page Using the Adapter Message class for message payloads. Scroll down this page to the section: Using the BESAdapterMessage Subclass.
Although you are using the adapter classes without the modeler you may find some of the other help topics in the UML Modeling Help useful. Look under Modeling Activities for e-business Integration -> Creating Messaging Adapters.
I have raised a bug to put more validation in so that the error message will specify that properties have not been sent. Here is the abstract from help:
The BESAdapterMessage class (oracle.bm.ebiadapters.BESAdapterMessage) is a subclass of AdapterMessage. It provides additional functionality which is needed by the e-business integration generators to achieve full integration. In addition to setting the payload, the BESAdapterMessage class allows you to set metadata properties which are mapped to JMS header fields. Some of these properties are mandatory and some are optional. For example, the setEventName(String eventName) and setEventKey(String eventKey) methods can be used to set the mandatory Event Name and Event Key properties. Once set, these properties are mapped to JMS header properties to allow the JMS messages to be correctly propagated between Oracle AQ queues.
I've also raised a doc. bug to look again at the doc in this area.
Thank you very much for taking the time to report on this problem. We are reliant on input from people like you to continue to improve our product.
Rgds
Susan