Help! problem about jstl sql with "LIKE?" in query

Hi All,
I have a problem about getting data by using "LIKE" in my sql statment.
here is my case:
<sql:query var="tmp">
SELECT ...... FROM ...
WHERE a LIKE ?
<sql:param value="%${param.a}%"/>
</sql:query>
Once I used "LIKE" keyword, the query failed to use this critica.
and couldn't find any match cases
thx or help
Micheal

besides, i found that:
this works:
"AND a.block LIKE '%' + 'a' + '%'"
but these don't work:
"AND a.block LIKE '%' + 'a' + '' + '%'"
or
"AND a.block LIKE '' + '%' + 'cp' + '%'"
or
"AND a.block LIKE '%' + 'cp' + '%' + ''"
it seems '' is the casue of error... so strange, anyone has idea?
micheal

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