The class org.jboss.ws.core.soap.SAAJMetaFactoryImpl.class is declared in the file META-INF/services/javax.xml.soap.MetaFactory in jboss-saaj.jar. Unfortunately I cannot find any jar file where org.jboss.ws.core.soap.SAAJMetaFactoryImpl.class is included. Does anyone know which jar file or maven artifact includes this class? Without it I get the following exception when starting a web application using JAX-WS on JBoss 4.3: Caused by: java.lang.IllegalStateException: Failed to load javax.xml.soap.MetaFactory: org.jboss.ws.core.soap.SAAJMetaFactoryImpl | at javax.xml.soap.SAAJFactoryLoader.loadFactory(SAAJFactoryLoader.java:131) | at javax.xml.soap.SAAJMetaFactory.getInstance(SAAJMetaFactory.java:60) | at javax.xml.soap.MessageFactory.newInstance(MessageFactory.java:106) | at com.sun.xml.ws.api.SOAPVersion.<init>(SOAPVersion.java:178) | at com.sun.xml.ws.api.SOAPVersion.<clinit>(SOAPVersion.java:83) | ... 140 more | Caused by: java.lang.ClassNotFoundException: org.jboss.ws.core.soap.SAAJMetaFactoryImpl | at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358) | at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204) | at javax.xml.soap.SAAJFactoryLoader.loadFactory(SAAJFactoryLoader.java:125) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4174938#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...