I'm using the following snippet of code to try and locate all instances of
ul and ol elements in an XHTML document. I want to perform operations only
on those ul and ol lists that are NOT embedded within another list.
I keep getting the null pointer error seen below when I run this code. Is
there something wrong with my XPath expression that is causing this problem,
or it possible that there is something weird, like an empty <ul></ul> in my
document???
Thanks!!
List lists = document.selectNodes( "//ul | //ol" );
for (int i=0; i < lists.size(); i++) {
Element list = (Element)lists.get(i);
List nodes = list.selectNodes("ancestor::ul");
if ((nodes != null) && (nodes.size() > 0)) {
continue;
}
nodes = list.selectNodes("ancestor::ol");
if ((nodes != null) && (nodes.size() > 0)) {
continue;
}
// do something with the list elements
}
java.lang.NullPointerException
at
org.jaxen.dom4j.DocumentNavigator.getParentAxisIterator(DocumentNavigator.ja
va:150)
at
org.jaxen.util.AncestorAxisIterator.createIterator(AncestorAxisIterator.java
:28)
at
org.jaxen.util.StackedIterator.internalCreateIterator(StackedIterator.java:5
7)
at org.jaxen.util.StackedIterator.next(StackedIterator.java:82)
at
org.jaxen.expr.DefaultLocationPath.evaluate(DefaultLocationPath.java:139)
at org.jaxen.expr.DefaultXPath.asList(DefaultXPath.java:46)
at org.jaxen.JaXPath.jaSelectNodes(JaXPath.java:35)
at org.jaxen.BaseXPath.selectNodes(BaseXPath.java:22)
at org.dom4j.xpath.DefaultXPath.selectNodes(DefaultXPath.java:122)
at org.dom4j.tree.AbstractNode.selectNodes(AbstractNode.java:164)
at
com.finaltouch.xml.editor.io.TableListFilter.run(TableListFilter.java:47)
at java.lang.Thread.run(Thread.java:484)
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