Tiles 2.2.2 tag putAttribute does not work

[jacky163com]

In tiles-test-2.2.2 application, the putAttribute tag () works. But in my 
application it does not work. Value of the attribute, which is of type 
"string", is always the value specified in tiles.xml. That is, the attribute 
value cannot be overridden. Now I am sure there is something wrong in my tiles 
configuration. I tried to copy part of the configuration from the 
tiles-test-2.2.2 application, but it still does not work. What is the critical 
configuration for tag to override an attribute value?