}
@Test
public void testSimpleEnversOperation() throws Exception {
SLSBPU slsbpu = lookup("SLSBPU",SLSBPU.class);
Person p1= slsbpu.createPerson( "Strong","Liu","kexueyuan source road",307 );
Person p2= slsbpu.createPerson( "tom","cat","apache",34 );
Address a1 =p1.getAddress();
a1.setHouseNumber( 5 );
p2.setAddress( a1 );
slsbpu.updateAddress( a1 );
slsbpu.updatePerson( p2 );
int size = slsbpu.retrieveOldPersonVersionFromAddress( a1.getId() );
Assert.assertEquals( 1, size );