Hi struts-user, I apologize in advance for this kind of problem ,but I think it is the best mailing-list I am aware of :) So when I use the ant to build my application, there are some error: Buildfile: build.xml BUILD FAILED javax.xml.parsers.FactoryConfigurationError: org.apache.crimson.jaxp.SAXParserFa ctoryImpl at javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java: 95) at org.apache.tools.ant.ProjectHelper.getParserFactory(ProjectHelper.jav a:706) at org.apache.tools.ant.ProjectHelper.parse(ProjectHelper.java:105) at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.jav a:85) at org.apache.tools.ant.Main.runBuild(Main.java:403) at org.apache.tools.ant.Main.main(Main.java:149) Total time: 0 seconds org.apache.crimson.jaxp.SAXParserFactoryImpl And I have put ant.jar, jaxp.jar, servlet.jar, and parser.jar these archives under $TOMCAT_HOME/lib directory . please help me .thx :=) Best regards, JeanX pacificnet.com(GZ)