I got following message when starting the example SB-Client. E:\java\jonas_jdk1.2\examples\src\sb>java sb.ClientOp Create a bean Start a first transaction Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing class at org.objectweb.jonas.jtm.TransactionImpl.<init>(TransactionImpl.java:78) at org.objectweb.jonas.jtm.Current.begin(Current.java:148) at sb.ClientOp.main(ClientOp.java:87) I use JDK 1.2.2 my CLASSPATH is E:\java\jonas_jdk1.2\examples\src\sb>set CLASSPATH=e:\java\jonas_jdk1.2; e:\java\jonas_jdk1.2;e:\java\jonas_jdk1.2\examples\classes; E:\java\jdk.1.2.2\lib\jndi.jar;E:\java\jdk.1.2.2\lib\providerutil.jar;E:\jav a\jdk.1.2.2\lib\rmiregistry.jar; E:\java\jdk.1.2.2\lib\j2ee.jar;E:\java\jdk.1.2.2\lib\jta-spec1_0_1.jar; E:\java\jdk.1.2.2\lib\jdbc2_0-stdext.jar;e:\java\jonas_jdk1.2\lib\RMI_jonas. jar My EJB Server seems to start and work well: E:\java\jonas_jdk1.2\examples\src\sb>java -Dinstall.root=e:\java\jonas_jdk1. 2 -Djava.security.policy=e:\java\jonas_jdk1.2\java.policy org.objectweb.jonas.server.Server JOnAS Server, version 2.0, running on rmi. JBeanHome constructor for Op JSessionHome constructor for Op JBeanMetaData.JBeanMetaData(ejbHome,sb.OpHome, sb.Op, null, true, false) JBeanHome.setEJBMetaData() EJBHome:sb.JOnASOpBeanOpHome for Op available EJBServer is ready JSessionHome.preinvoke JBeanHome.postinvoke What is the meaning of this message. Where is my misstake. Sincerely, Jörn Knust Boss GmbH [EMAIL PROTECTED] ---- To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "unsubscribe jonas-users". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".