Thank you for your reply. Yesterday, I tried the deployment with db2(non xa) , it works well. I think the class is ok, there must be somthing wrong in my jboss configuation. This are my ejb-jar.xml and db2-xa-ds.xml. <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd"> <ejb-jar> <display-name>SysmgrEJBModule</display-name> <enterprise-beans> <ejb-name>PostMgmtSession</ejb-name> com.oss.sysmgr.ejbs.PostMgmtSessionHome com.oss.sysmgr.ejbs.PostMgmtSession <ejb-class>com.oss.sysmgr.ejbs.PostMgmtSessionBean</ejb-class> <session-type>Stateless</session-type> <transaction-type>Bean</transaction-type> </enterprise-beans> <assembly-descriptor> <container-transaction> <ejb-name>PostMgmtSession</ejb-name> <method-name>*</method-name> <trans-attribute>Required</trans-attribute> </container-transaction> </assembly-descriptor> </ejb-jar> <?xml version="1.0" encoding="UTF-8"?> <!-- ===================================================================== --> <!-- --> <!-- JBoss Server Configuration --> <!-- Thanks to Horia Muntean <horia(a)bvb.ro&gt; --> <!-- ===================================================================== --> <!-- $Id: db2-xa-ds.xml,v 1.4 2004/09/15 14:37:40 loubyansky Exp $ --> <!-- XADatasource for DB2 V8.1 (app driver) copy $db2_install_dir/java/db2java.zip into $jboss_install_dir/server/default/lib --> <xa-datasource> <jndi-name>DSTopEng</jndi-name> <xa-datasource-class>COM.ibm.db2.jdbc.DB2XADataSource</xa-datasource-class> <xa-datasource-property name="DatabaseName">BOSSDB2</xa-datasource-property> <xa-datasource-property name="User">topeng</xa-datasource-property> <xa-datasource-property name="Password">bossDB2</xa-datasource-property> <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml (optional) --> <type-mapping>DB2</type-mapping> </xa-datasource> <xa-datasource> <jndi-name>DSAudit</jndi-name> <xa-datasource-class>COM.ibm.db2.jdbc.DB2XADataSource</xa-datasource-class> <xa-datasource-property name="DatabaseName">BOSSDB2</xa-datasource-property> <xa-datasource-property name="User">USER_AUDIT</xa-datasource-property> <xa-datasource-property name="Password">bossDB2</xa-datasource-property> <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml (optional) --> <type-mapping>DB2</type-mapping> </xa-datasource> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991512#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...