yet another NoClassDefFoundError 2006-05-30 - By Tobias Thierer
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Hi,
I have an XML document to parse in the form:
<a>
<b>...</b>
<b>...</b>
<b>...</b>
..
<b>...</b>
</a>
The whole document is too large to hold in memory, so I wanted to get only
one b-element at the time from the parser. I tried to use ElementScanner and
ElementListener from jdom-contrib, but run into a NoClassDefFoundError when
I call
elementScanner.addElementListener(elementListener, "/a/*");
I also get the error when I try the ElementScannerTest.java example file
(attached) that comes with the jdom-contrib documentation. The error occurs
in line 384 of XPathMatcher.java, where it tries to call
Class.forName("org.jdom.contrib.input.scanner.JakartaRegExpXPathMatcher")
this fails with a NoClassDefFoundError which is then caught and masked, so
in the end I get the following error message:
Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/regexp/RESyntaxException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at
org.jdom.contrib.input.scanner.XPathMatcher.newXPathMatcher(XPathMatcher.java
:384)
at
org.jdom.contrib.input.scanner.ElementScanner.addElementListener(ElementScanner
.java:240)
at ElementScannerTest.main(ElementScannerTest.java:23)
I've searched this mailinglist's archives and there were plenty repors of
NoClassDefFoundErrors, but none of them in conjunction with RESyntaxException.
I have observed this problem on three different machines, but still wonder
if it might be a configuration problem. Any ideas or hints would be greatly
appreciated.
Thanks in advance,
Tobias
P.S.: An IntelliJ project including jdom.jar, jdom-contrib.jar and
ElementScannerTest.java which exhibits the above error can be downloaded
from: http://www.tobias-thierer.de/stuff/jdom-error.zip
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