List JNDI Names

Sometimes we need to list all the JNDI names in an application server for debugging purpose. Other times, we may wish to list available datasources in a dropdown list for end-users to choose from. How to do this? In a nutshell, the JNDI bindings are organized in a tree strucuture. The following code is a simple example to recursively exhaust this binding tree:

Context ctx = (Context)new InitialContext().lookup("java:comp/env");
listContext(ctx, "");

/**
* Recursively exhaust the JNDI tree
*/
private static final void listContext(Context ctx, String indent) {
try {
   NamingEnumeration list = ctx.listBindings("");
   while (list.hasMore()) {
       Binding item = (Binding) list.next();
       String className = item.getClassName();
       String name = item.getName();
       logger.log(Level.INFO, indent + className + " " + name);
       Object o = item.getObject();
       if (o instanceof javax.naming.Context) {
    listContext((Context) o, indent + " ");
       }
   }
} catch (NamingException ex) {
   logger.log(Level.WARNING, "JNDI failure: ", ex);
}