add main

8,9c8,9
<         final _<Item> item = new _<Item>();
<         final _<Connection> c = new _<Connection>();
---
>         final GenericWrapper<Item> item = new GenericWrapper<Item>();
>         final GenericWrapper<Connection> c = new GenericWrapper<Connection>();
12c12
<                item._ = c._.query( itemId );
---
>                item.genericWrapper = c.genericWrapper.query( itemId );
15c15
<         return item._;
---
>         return item.genericWrapper;
18,19c18,19
< class _<E>{
<     public E _;
---
> class GenericWrapper<E>{
>     public E genericWrapper;
34c34
<     public static void with( ConnectionFactory factory, _<Connection> c, Runnable block ) {
---
>     public static void with( ConnectionFactory factory, GenericWrapper<Connection> c, Runnable block ) {
36,37c36,37
<             c._ = factory.getConnection();
<             c._.open();
---
>             c.genericWrapper = factory.getConnection();
>             c.genericWrapper.open();
41,42c41,42
<             if( c._ != null ) try {
<                 c._.close();
---
>             if( c.genericWrapper != null ) try {
>                 c.genericWrapper.close();