NPE in XMLEntityManager
-----------------------
Key: XERCESJ-1272
URL: https://issues.apache.org/jira/browse/XERCESJ-1272
Project: Xerces2-J
Issue Type: Bug
Affects Versions: 2.6.2, 2.9.1
Environment: Weblogic 8.1 SP 5 running on Solaris 2.10, Axis 1.4
Reporter: Shinta
Our application runs on Weblogic 8.1 SP 5. It makes a webservice call to an
Axis webservice. When we ran our load tests, we would occasionally get the
following exception:
my.exceptions.ProviderException: java.lang.NullPointerException
at my.ReferenceWebservicesPlugin.sendOutBoundResult(Unknown Source)
at
my.ejb.NBINotificationServiceMDB.onMessage(NBINotificationServiceMDB.java:60)
at weblogic.ejb20.internal.MDListener.execute(MDListener.java:400)
at
weblogic.ejb20.internal.MDListener.transactionalOnMessage(MDListener.java:333)
at weblogic.ejb20.internal.MDListener.onMessage(MDListener.java:298)
at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:2686)
at weblogic.jms.client.JMSSession.execute(JMSSession.java:2598)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
Caused by: java.lang.NullPointerException
at org.apache.axis.AxisFault.makeFault(AxisFault.java:101)
at org.apache.axis.client.Call.invoke(Call.java:2446)
at org.apache.axis.client.Call.invoke(Call.java:2366)
at org.apache.axis.client.Call.invoke(Call.java:1812)
at
my.service.NotificationEventServiceSoapBindingStub.processDeviceActivationResult(Unknown
Source)
... 9 more
Caused by: java.lang.NullPointerException
at
java.io.FilterInputStream.read(FilterInputStream.java:66)
at
org.apache.xerces.impl.XMLEntityManager$RewindableInputStream.read(Unknown
Source)
at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown
Source)
at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown
Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
at
org.apache.axis.encoding.DeserializationContext.parse(DeserializationContext.java:227)
at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:696)
at org.apache.axis.Message.getSOAPEnvelope(Message.java:435)
at org.apache.axis.client.Call.invokeEngine(Call.java:2804)
at org.apache.axis.client.Call.invoke(Call.java:2767)
at org.apache.axis.client.Call.invoke(Call.java:2443)
... 12 more
We originally ran the application with Xerces 2.6.2 and have tried 2.9.1. Same
issue happened on 2.9.1 as well.
While looking at the source code for Xerces 2.9.1, I noticed this:
// create reader
InputStream stream = null;
Reader reader = xmlInputSource.getCharacterStream();
// First chance checking strict URI
String expandedSystemId = expandSystemId(literalSystemId, baseSystemId,
fStrictURI);
if (baseSystemId == null) {
baseSystemId = expandedSystemId;
}
if (reader == null) {
stream = xmlInputSource.getByteStream();
if (stream == null) {
URL location = new URL(expandedSystemId);
URLConnection connect = location.openConnection();
if (!(connect instanceof HttpURLConnection)) {
stream = connect.getInputStream();
}
else {
boolean followRedirects = true;
// setup URLConnection if we have an HTTPInputSource
if (xmlInputSource instanceof HTTPInputSource) {
final HttpURLConnection urlConnection =
(HttpURLConnection) connect;
final HTTPInputSource httpInputSource =
(HTTPInputSource) xmlInputSource;
// set request properties
Iterator propIter =
httpInputSource.getHTTPRequestProperties();
while (propIter.hasNext()) {
Map.Entry entry = (Map.Entry) propIter.next();
urlConnection.setRequestProperty((String)
entry.getKey(), (String) entry.getValue());
}
// set preference for redirection
followRedirects =
httpInputSource.getFollowHTTPRedirects();
if (!followRedirects) {
setInstanceFollowRedirects(urlConnection,
followRedirects);
}
}
stream = connect.getInputStream();
// REVISIT: If the URLConnection has external encoding
// information, we should be reading it here. It's located
// in the charset parameter of Content-Type. -- mrglavas
if (followRedirects) {
String redirect = connect.getURL().toString();
// E43: Check if the URL was redirected, and then
// update literal and expanded system IDs if needed.
if (!redirect.equals(expandedSystemId)) {
literalSystemId = redirect;
expandedSystemId = redirect;
}
}
}
}
// wrap this stream in RewindableInputStream
stream = new RewindableInputStream(stream);
Could it be that the call to "stream = connect.getInputStream()" returns null?
In this case the RewindableInputStream() will contain a null stream and when we
try to read it, we will get NPE?
This code probably could be made more robust by checking for the null stream....
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