Why can I not execute a query on the XSystem

In the Java API Documentation I found on side 16 how to create a query over the XSystem.

But if I try this I get an exception.

Here ist the code:

package testTool;
 
import org.snia.xam.AuthenticationExpiredException;
import org.snia.xam.AuthorizationException;
import org.snia.xam.InvalidArgumentException;
import org.snia.xam.InvalidXSetModeException;
import org.snia.xam.XAMException;
import org.snia.xam.XAMLibrary;
import org.snia.xam.XAMLibraryObj;
import org.snia.xam.XSet;
import org.snia.xam.XSetInaccessibleException;
import org.snia.xam.XSystem;
import org.snia.xam.XSystemAbandonException;
import org.snia.xam.XSystemCorruptException;
 
/**
 * TODO: pupose of this class
 * 

 * Copyright © Cerner Corporation 2008 All rights reserved.
 * 
 * @author Ralf Liesen
 * @version $Revision$
 */
public class QueryXSet
{
 
    /**
     * @param args
     * @throws XAMException 
     * @throws InvalidArgumentException 
     * @throws AuthorizationException 
     * @throws AuthenticationExpiredException 
     * @throws XSystemCorruptException 
     * @throws XSystemAbandonException 
     * @throws XSetInaccessibleException 
     * @throws InvalidXSetModeException 
     */
    public static void main(String[] args) throws InvalidXSetModeException, XSetInaccessibleException, XSystemAbandonException,    XSystemCorruptException, AuthenticationExpiredException, AuthorizationException, InvalidArgumentException, XAMException
    {
        // Connect to the archive system
        String xri = "snia-xam://centera_vim!128.221.200.60?C:/Ralf/xam/xamconnect.pea";
        
        System.out.println("Store Content to EMC Centera over XAM");
        
        XAMLibrary xam = XAMLibraryObj.getLibrary();
            
        xam.setProperty( XAMLibrary.XAM_LOG_LEVEL, XAMLibrary.XAM_LOG_ALL );
        xam.setProperty( XAMLibrary.XAM_LOG_PATH, "C:/Ralf/xam/xam.log" );
 
        System.out.println("Query an XSystem - Centera cluster(" + xri + ")");
        XSystem sys = xam.connect(xri);
        
        XSet query;
        query = sys.createXSet( XSet.MODE_RESTRICTED );
        query.createProperty( XSet.XAM_JOB_COMMAND, false, XSet.XAM_JOB_QUERY);
        query.createProperty( XSet.XAM_JOB_QUERY_COMMAND, false, "select \".xset.xuid\"" );
        query.submitJob();
        
        // Wait for the job to complete.
        
        String queryStatus = query.getString( XSet.XAM_JOB_ERROR );
        if( queryStatus.equals( XSet.XAM_JOB_ERRORHEALTH_OK ))
        {
            XStream results = query.openXStream( XSet.XAM_JOB_QUERY_RESULTS, XStream.MODE_READ_ONLY );
            byte rawXUID[] = new byte[80];
            int bytesRead = 0;
            while( (bytesRead = (int) results.read(rawXUID)) >= 0 )
            {
                XUID localXUID = new XAMXUID(rawXUID);
                XSet data = sys.openXSet( localXUID, XSet.MODE_READ_ONLY );
                // Process results
                //
                System.out.println("Test: " + localXUID);
                data.close();
            }
            results.close();
        }
        query.close();
    }
}

And here is the exception:

Store Content to EMC Centera over XAM

Query an XSystem - Centera cluster(snia-xam://centera_vim!128.221.200.60?C:/Ralf/xam/xamconnect.pea)

Exception in thread "main" org.snia.xam.JobCommandException: xam/job command invalid

at org.snia.xam.XAMErrors.throwConvertedException(Unknown Source)

at org.snia.xam.XAMErrors.throwConvertedException(Unknown Source)

at org.snia.xam.XSetImpl.submitJob(Unknown Source)

at testTool.QueryXSet.main(QueryXSet.java:60)

Why did I get this exception? What's my mistake?

Thanks Ralf