Seems the new location of what was the 'validate-jar' target is causing problems:
validate-jars: Copying 1 file to /old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/build/cocoon-2.1-dev/temp Processing /old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/lib/jars.xml to /old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/build/cocoon-2.1-dev/temp/jars.xml Loading stylesheet /old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/tools/src/check-jars.xsl old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/tools/src/check-jars.xsl:44:37: Warning! [WARN] Poor filename for file endorsed/xml-apis.jar Please add version number or datestamp. old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/tools/src/check-jars.xsl:44:37: Warning! [WARN] Poor filename for file optional/jstyle.jar Please add version number or datestamp. old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/tools/src/check-jars.xsl:44:37: Warning! [WARN] Poor filename for file deli/lib/rdffilter.jar Please add version number or datestamp. old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/tools/src/check-jars.xsl:44:37: Warning! [WARN] Poor filename for file swf/lib/spark.jar Please add version number or datestamp. old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/tools/src/check-jars.xsl:44:37: Warning! [WARN] Poor filename for file axis/lib/commons-discovery.jar Please add version number or datestamp. old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/tools/src/check-jars.xsl:89:36: Warning! File lib/core/util.concurrent-1.3.1.jar is declared in lib/jars.xml, but doesn't appear in the lib/ directory. If this file was removed, please update the lib/jars.xml file to remove this file entry. : Fatal Error! Stylesheet directed termination : Fatal Error! Fatal error during transformation Cause: Fatal error during transformation Failed to process /old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/lib/jars.xml BUILD FAILED file:///old/home/jeff/homeoverflow/apache/xml/cocoon-2.1/src/targets/validate-build.xml:51: Fatal error during transformation The jar is definitely there: [cocoon-2.1 ~]$ ls -la lib/core/util.concurrent-1.3.1.jar -rwxr-xr-x 1 jeff jeff 217848 Mar 24 23:11 lib/core/util.concurrent-1.3.1.jar --Jeff