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I've just discovered
an issue with Cocoon, Xerces, and Java HotSpot 1.0.1.
It would appear they
don't work very well together.
With HotSpot
installed, Xerces exceptions (exception appended below) when loading an xml
document a second time, that makes use of XSP.
HotSpot is an
enhanced JVM which JIT-compiles and attempts to optimise oft-repeated
code. Obviously it's compilation is interfering with the XSP/Xerces
processing. As for "why", we'll leave for another day.
The problem is
easily reproducible. Hotspot can be installed and removed without a reboot, just
stop and start Apache. I've tested this scenario on three machines, all
with same results.
Config:
NT 4
SP6
Apache
1.3.11
Jserv
1.1
JDK
1.2.2
JSDK 2.1
HotSpot
1.0.1
Cocoon
1.6.1
Xerces
1.0.1
Xalan
0.19.2
FOP
0.12.0
Exception:
java.lang.NullPointerException at org.apache.xerces.dom.DeferredDocumentImpl.synchronizeChildren(DeferredDocumentImpl.java:1218) at org.apache.xerces.dom.NodeImpl.getChildNodes(NodeImpl.java:520) at org.apache.cocoon.Utils.getFirstPI(Utils.java:116) at org.apache.cocoon.processor.ProcessorFactory.getType(ProcessorFactory.java:79) at org.apache.cocoon.processor.ProcessorFactory.getProcessor(ProcessorFactory.java:70) at org.apache.cocoon.Engine.handle(Engine.java:282) at org.apache.cocoon.Cocoon.service(Cocoon.java:145) at javax.servlet.http.HttpServlet.service(HttpServlet.java:840) at org.apache.jserv.JServConnection.processRequest(JServConnection.java:314) at org.apache.jserv.JServConnection.run(JServConnection.java:188) at java.lang.Thread.run(Thread.java:479) Joel
Hughes
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