[AXIS2-795] Returning a MTOM message causes IOException (closed stream)

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 1.0
• Component/s: databinding
• Environment: JDK 1.4.2_06
• Assignee: Nanayakkara Kuruppuge Thilina Gunarathne
• Reporter: Wolfram Kaiser
• Created: 02/Jun/06 16:47
• Updated: 31/Aug/07 15:27
• Resolved: 16/Oct/06 07:11

Description

When accessing an attachment sent via MTOM on the client side I get the following exception:

org.apache.axiom.om.OMException: javax.mail.MessagingException: Error in input stream; nested exception is:
java.io.IOException: Attempted read on closed stream.
at org.apache.axiom.attachments.Attachments.getPart(Attachments.java:462)
at org.apache.axiom.attachments.Attachments.getNextPart(Attachments.java:359)
at org.apache.axiom.attachments.Attachments.getPart(Attachments.java:324)
at org.apache.axiom.attachments.Attachments.getDataHandler(Attachments.java:274)
at org.apache.axiom.om.impl.mtom.MTOMStAXSOAPModelBuilder.getDataHandler(MTOMStAXSOAPModelBuilder.java:151)
at org.apache.axiom.om.impl.llom.OMTextImpl.getDataHandler(OMTextImpl.java:341)

The client stub was generated using the default / no data binding (-> direct Axiom access). I believe the error is in the generated stub:

public org.apache.axiom.om.OMElement echoPdf(org.apache.axiom.om.OMElement param48) throws java.rmi.RemoteException {
...
_messageContext.getTransportOut().getSender().cleanup(_messageContext);
return (org.apache.axiom.om.OMElement) object;
}

The cleanup() seems to close the InputStream for the PDF/attachment while the attachment has not been loaded in Axiom. Thus, when accessing the attachment in the OMElement returned by MyStub.echoPdf() the aforementioned exception is thrown. I would argue that the pull mechanism of Axiom fails in cases where the associated InputStream has been closed while the generated stub has done its processing already.

The following simple - but rather ugly - work-around seems to solve the problem:

public org.apache.axiom.om.OMElement echoPdf(org.apache.axiom.om.OMElement param48) throws java.rmi.RemoteException {
...
org.apache.axiom.om.OMElement omElement = (org.apache.axiom.om.OMElement) object;
// retrieving the content of a OMTextNode will load the associated data so it can be accessed
// even after the InputStream from this web service call has been closed.
omElement.getText(); // or omElement.toString();
_messageContext.getTransportOut().getSender().cleanup(_messageContext);
return omElement;

The getText()/toString() has the effect that all binary data from the web service call is loaded in the Axiom objects so they can be accessed in the client code which uses the MyStub.echoPdf() method.