In my previous post I wrote about developing a web service endpoint on JDK 1.6 and at the end of the blog I wrote how to run wsimport command line tool from the standalone JAXWS 2.1 RI on top of jdk 1.6.
You do not want to put all the jars from @JAXWS_HOME/lib into endorsed directory. This may work for wsimport command line tool as mentioned in my previous blog, but will cause error when you try to run Wsimport ant task. the reason is that Wsimport ant task class will be loaded by the boot classloader and when it tries to load ant's classes it fails as they are not loaded by the boot classloader. So in this case it would fail with this error:
taskdef A class needed by class com.sun.tools.ws.ant.WsImport cannot be found: org/apache/tools/ant/taskdefs/MatchingTask
See the issue reported for details.
Basically you need to put only two jars in the endorsed directory, jaxws-api.jar and jaxb-api.jar, see Endorsed Directory Mechanism for more details.
You would pretty much do the following to run wsimport, both ant task and command line tool from JAXWS 2.1 RI on JDK 1.6:
$JAXWS_HOME points to the directory where you installed JAXWS 2.1 RI.