Bug 17321

Summary:	NPE from <x:out> with invalid select value
Product:	Taglibs	Reporter:	Hans Bergsten <hans>
Component:	Standard Taglib	Assignee:	Tomcat Developers Mailing List <dev>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	P3
Version:	unspecified
Target Milestone:	---
Hardware:	All
OS:	All

Description Hans Bergsten 2003-02-23 20:05:46 UTC

The <x:out> action in 1.0.3 (and previous versions) throws an NPE if you give it
an invalid "select" attribute value, e.g.

  <x:out select="foo" />

java.lang.NullPointerException
	at org.jaxen.dom.DocumentNavigator$1.getFirstNode(DocumentNavigator.java:175)
	at org.jaxen.dom.DocumentNavigator$NodeIterator.(DocumentNavigator.java:823)
	at org.jaxen.dom.DocumentNavigator$1.(DocumentNavigator.java:172)
	at org.jaxen.dom.DocumentNavigator.getChildAxisIterator(DocumentNavigator.java:172)
	at org.jaxen.expr.iter.IterableChildAxis.iterator(IterableChildAxis.java:82)
	at org.jaxen.expr.DefaultStep.axisIterator(DefaultStep.java:139)
	at org.jaxen.expr.DefaultLocationPath.evaluate(DefaultLocationPath.java:188)
	at org.jaxen.expr.DefaultXPathExpr.asList(DefaultXPathExpr.java:107)
	at org.jaxen.BaseXPath.selectNodesForContext(BaseXPath.java:716)
	at org.jaxen.BaseXPath.selectSingleNodeForContext(BaseXPath.java:739)
	at org.jaxen.BaseXPath.stringValueOf(BaseXPath.java:281)
	at org.apache.taglibs.standard.tag.common.xml.XPathUtil.valueOf(XPathUtil.java:239)
	at
org.apache.taglibs.standard.tag.common.xml.ExprSupport.doStartTag(ExprSupport.java:102)
	at org.apache.taglibs.standard.tag.el.xml.ExprTag.doStartTag(ExprTag.java:103)
[...]

Comment 1 Pierre Delisle 2003-02-26 22:07:56 UTC

This requires some clarification to the spec to clearly state
the default context node associated with XPath expressions.

The expert group has approved this clarification and this will
be fixed in JSTL's upcoming maintenance release.

Comment 2 Pierre Delisle 2003-08-04 18:36:11 UTC

Fixed in 1.1.