[XALANJ-2320] Excluding result prefix of a namespace not declared caused NPE

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.7
• Fix Version/s: 2.7.1
• Component/s: transformation
• Assignee: Unassigned
• Reporter: Andrew Hay
• Created: 12/Sep/06 13:15
• Updated: 18/Dec/07 14:30
• Resolved: 17/Oct/06 17:41

Description

Currently migrating from Xalan 2.3.1 to 2.7.0. Had an issue with an XSL stylesheet which declared a number or namespaces and excluded a number of result prefixes. This worked under 2.3.1 but produced NPE in 2.7.0 with stack trace of :-

java.lang.NullPointerException
at org.apache.xalan.transformer.TransformerImpl.setParameter(TransformerImpl.java:1558)
at org.apache.xalan.transformer.TransformerImpl.setParameter(TransformerImpl.java:1606)
at com.axa.framework.util.XSLEngineImpl.translate(XSLEngineImpl.java:140)
at com.axa.framework.util.XSLEngineUtil.translate(XSLEngineUtil.java:79)
at com.axa.framework.processor.EventProcessor.translate(EventProcessor.java:1198)
at com.axa.framework.processor.EventProcessor.handleServiceEvent(EventProcessor.java:550)
at com.axa.framework.processor.EventProcessor.process(EventProcessor.java:141)
at com.axa.framework.processor.soap.RpcSOAPProcessorManager.handleEvent(RpcSOAPProcessorManager.java:83)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.axa.rpc.RpcThread.execute(RpcThread.java:240)
at com.axa.rpc.RpcThread.run(RpcThread.java:135)

The XSL stylesheet decalaration is :-

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:polphdr="http://www.polaris-uk.co.uk/GenericSchema/2_1/PEMHeader"
xmlns:java="http://xml.apache.org/xslt/java"
exclude-result-prefixes="axa soap-env java">

The problem was resolved by removing axa from the list of namespaces. Would have expected a more graceful throwing of the error or ignoring of the result prefix exclusion if the namespace cannot be determined.