I see we are still using bcel in 4.2: /home/svn/JBossAS/JBoss4.2/Branch_4_2/build/build.xml:803: The following error occurred while executing this line: /home/svn/JBossAS/JBoss4.2/Branch_4_2/build/build-thirdparty.xml:123: Unable to get remote file=/home/svn/JBossAS/JBoss4.2/Branch_4_2/thirdparty/apache-bcel/component-info.xml url=file:/usr/Repository/repository.jboss.com/apache-bcel/5.1-brew/compon... All this is used for is the old cmp2 proxy generation. This could be replaced with javassist proxies to drop yet another byte code generation dependency.