【help】lookup Error

[pinheng wang]

in SessionBean:
public void setSessionContext(SessionContext sessionContext) {
this.sessionContext = sessionContext;
try {
javax.naming.Context context1 = new javax.naming.InitialContext();
if(logging)System.out.println("start to lookup entitybean jndi 2");
countrylistHome = (MmshowCountrylistHome) context1.lookup("java:comp/env/ejb/MmshowCountrylist");
if(logging)System.out.println("sessionbean jndi successful");
}
catch (Exception ex) {
if(logging)System.out.println(ex.toString());
}
}
Error message：
javax.naming.NameNotFoundException: Unable to resolve comp/env/ejb/MmshowCountrylist Resolved: 'comp/env' Unresolved:'ejb' ; remaing name 'MmshowCountrylist'