[AXIS2-3195] AXIOM parser's throwing NullPointerException if OMElement.getParent() is instance of OMDocument and Rampart is engaged

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Invalid
• Environment: Windows XP SP2, Axis2 1.2, Tomcat 6.0.13
• Assignee: Ruchith B. Gunaratne
• Reporter: Christopher Weiss
• Created: 12/Sep/07 18:08
• Updated: 29/Mar/12 06:47
• Resolved: 13/Jun/09 15:14

Description

Please see attached project to demonstrate the issue. With the axis2-1.2 release and earlier, the AXIOM parser throws a NullPointerException when processing requests using Rampart:

Thread [main] (Suspended (exception NullPointerException))
OMStAXWrapper.updateNextNode() line: 981
OMStAXWrapper.updateLastNode() line: 950
OMStAXWrapper.next() line: 913
StAXSOAPModelBuilder(StAXOMBuilder).next() line: 111
SOAPEnvelopeImpl(NodeImpl).build() line: 469
SOAPMessageImpl(DocumentImpl).build() line: 476
Axis2Util.getDocumentFromSOAPEnvelope(SOAPEnvelope, boolean) line: 107
RampartMessageData.<init>(MessageContext, boolean) line: 146
MessageBuilder.build(MessageContext) line: 56
RampartSender.invoke(MessageContext) line: 59
Phase.invoke(MessageContext) line: 382
AxisEngine.invoke(MessageContext) line: 522
AxisEngine.send(MessageContext) line: 655
OutInAxisOperationClient.send(MessageContext) line: 237
OutInAxisOperationClient.execute(boolean) line: 202
EchoStub.EchoOperation(OMElement) line: 127
Client.main(String[]) line: 47

The cause of the exception is the AXIOM parser's setting the boolean variable needToThrowEndDocument in the DOMStAXWrapper to true if the current node being parsed has a parent node of type OMDocument..

Temp fix: In the code, when creating an AXIOM compatible schema, we did the following:

try {
// Get the schema is it is already AXIOM compatible, or convert it if it isn't.
OMElement schema = docSchema instanceof OMDocument ? (OMElement) docSchema
.getDocumentElement() : org.apache.axis2.util.XMLUtils.toOM(docSchema.getDocumentElement());

// Workaround to fix an issue with the building the OMElement if the
// parent is an OMDocument. Detach the element from the parent Document...
if (schema.getParent() != null && schema.getParent() instanceof OMDocument)

{ schema.detach(); }

elementList.add(org.apache.axis2.databinding.utils.Constants.OM_ELEMENT_KEY);
elementList.add(schema);
} catch (Exception e) {
throw new java.lang.RuntimeException("Can't convert schema to AXIOM!", e);
}