Running jt400Native on iSeries

I'm trying to start Websphere on iseries using the jt400Native jar. For one 
user profile I get the error shown below (Class not found) when I try to 
preInitialize command connections, however using a different user profile which 
has *ALLOBJ authority the connection works. I started Websphere with verbose 
logging and show part of the log below. I note the message "Finding native 
method library: QSYS QYJSPART". Looking at the jt400 source it has the java 
statement: 
 
System.load("/QSYS.LIB/QYJSPART.SRVPGM");
 
It seems from the log it found the class and loaded the native library. The 
library does have public execute authority so I'm stuck.
Has anyone else had this problem? Any suggestions?
 
Thanks,
Mike

 
====================
Websphere SystemOut.log
====================
[22/05/06 09:20:42:155 UTC] 0000000a access        E   Mon May 22 09:20:42:155 
UTC 2006  Unexpected ClassNotFoundException:
                                 java.lang.ClassNotFoundException: 
com.ibm.as400.access.NLSImplNative
 at java.lang.Throwable.<init>(Throwable.java:217)
 at java.lang.Exception.<init>(Exception.java:59)
 at java.lang.ClassNotFoundException.<init>(ClassNotFoundException.java:65)
 at 
com.ibm.ws.classloader.CompoundClassLoader.findClass(CompoundClassLoader.java:422)
 at 
com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:339)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:263)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:330)
 at java.lang.Class.forName(Class.java:164)
 at com.ibm.as400.access.AS400.loadImpl(AS400.java:1980)
 at com.ibm.as400.access.AS400ImplRemote.loadImpl(AS400ImplRemote.java:1312)
 at 
com.ibm.as400.access.AS400ImplRemote.getCcsidFromServer(AS400ImplRemote.java:779)
 at com.ibm.as400.access.AS400ImplRemote.signon(AS400ImplRemote.java:1737)
 at com.ibm.as400.access.AS400.sendSignonRequest(AS400.java:2555)
 at com.ibm.as400.access.AS400.promptSignon(AS400.java:2126)
 at com.ibm.as400.access.AS400.signon(AS400.java:3407)
 at com.ibm.as400.access.AS400.connectService(AS400.java:853)
 at com.ibm.as400.access.PoolItem.<init>(PoolItem.java:119)
 at 
com.ibm.as400.access.ConnectionList.createNewConnection(ConnectionList.java:130)
 at com.ibm.as400.access.ConnectionList.getConnection(ConnectionList.java:379)
 at 
com.ibm.as400.access.AS400ConnectionPool.getConnection(AS400ConnectionPool.java:702)
 at com.ibm.as400.access.AS400ConnectionPool.fill(AS400ConnectionPool.java:253)
 at com.ibm.as400.access.AS400ConnectionPool.fill(AS400ConnectionPool.java:212)

=============
ClassLoading log
=============
.....
Loading class com.ibm.as400.access.ChangePasswordReq from 
***/QIBM/UserData/WebSphere/AppServer/V6/Base/profiles/WAS60SVR/installedApps/LOOPBACK_WAS60SVR/Development.ear/jt400Native-5.1.1.jar***
Loading class com.ibm.as400.access.NativeVersion from 
***/QIBM/UserData/WebSphere/AppServer/V6/Base/profiles/WAS60SVR/installedApps/LOOPBACK_WAS60SVR/Development.ear/jt400Native-5.1.1.jar***
Loading class com.ibm.as400.access.NativeMethods from 
***/QIBM/UserData/WebSphere/AppServer/V6/Base/profiles/WAS60SVR/installedApps/LOOPBACK_WAS60SVR/Development.ear/jt400Native-5.1.1.jar***
Finding native method library: QSYS QYJSPART
Finding native method library: QSYS QYJSPSCK
Loading class com.ibm.as400.access.SignonConverter from 
***/QIBM/UserData/WebSphere/AppServer/V6/Base/profiles/WAS60SVR/installedApps/LOOPBACK_WAS60SVR/Development.ear/jt400Native-5.1.1.jar***
Loading class com.ibm.as400.access.AS400ImplNative from 
***/QIBM/UserData/WebSphere/AppServer/V6/Base/profiles/WAS60SVR/installedApps/LOOPBACK_WAS60SVR/Development.ear/jt400Native-5.1.1.jar***