Luke - Lucene Index Toolbox
If you're using the Jakarta Lucene fulltext search library you need Luke as well. Available as Java Web Start for easy installation.
Building XPath expression from XML node
Ever do parsing of large XML/DXL documents? Does the parsing ever fail? If it does you know you need some way to log the offending element in a compact and standardized way. For situations like this (and numerous others) XPath is the way to go and with code like I'll show in this post you are good to go. Java code ahead!