a question of collection's visiable

hello,i have a problem when i create 3 collections at one time .the code is follow:
     String driver = "org.apache.xindice.client.xmldb.DatabaseImpl";
     Class c = Class.forName(driver);

 

     Database database = (Database) c.newInstance();
     DatabaseManager.registerDatabase(database);
 
   Collection col=DatabaseManager.getCollection(XMLDataAccess.getXindiceURL());
   Collection congif=XMLDataAccess.createCollection(col,"ServiceAgentConfig");
   Collection manager=XMLDataAccess.createCollection(congif,"ServiceManage");
   Collection sa=XMLDataAccess.createCollection(congif,"ServiceAgent");
   Collection commands=XMLDataAccess.createCollection(congif,"Commands");
    manager.close();
   sa.close();
   commands.close();
                  congif.close();
                  col.close();
the problem is:after executing the code above,it seen successful,and  new collections can be seen in browse,but when the xindice server is restart,these new collections are invisiable.i have read the example of how to user xindice,and i can't find where the problem is. i use tomcat 5.0,jdk 1.4.2,windows 2000