Hi jaikiran, thanks for your reply. i also thought about it could relate to the blank in the system path definition. i now added the following code to the build.bat just behind my PATH definition: | echo JAVA VERSION: | java -version | when i run bulid. bat i get this output: | JAVA VERSION: | java version "1.5.0_15" | Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_15-b04) | Java HotSpot(TM) Client VM (build 1.5.0_15-b04, mixed mode, sharing) | Calling ..\tools\bin\ant.bat | But due to your advice then i masked the blank in build.bat and run.bat by this definition: | set JAVA_HOME=C:\PROGRA~1\JAVA\jdk1.5.0_15 | | set PATH=%ANT_HOME%\bin;%JAVA_HOME%\bin;%PATH% | Then i rebuilded jboss. when i start it get the same error message... Java is 1.5, Ant 1.6.5, the jbossws.sar is where it should be...to me it is quite nebulous why a build form source of jboss 4.2.3 does not work on my windows xp pc. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4176456#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...