JSP :: JSTL And EL - Long Value Cast To String

I'm trying to write a condition to jstl if tag,

<c:forEach var="ledg" items="user_ledgers">
<c:if test="${ledg.transactionID == param['trns']}">
<c:out value="${ledg.name}"/>
</c:if>
</c:forEach>

Ledg is an object of ledger class and transactionID is a field of type long.

I found this error while runtime.

javax.el.PropertyNotFoundException: Property 'transactionID' not found on type java.lang.String

I tried to convert transactioID value to String by several ways. But not working.

String concatenation
<c:if test="${(ledg.transactionID+’’) == param['trns']}">
Using custom tag
<c:set var="equals" scope="page">
<z:doTheyEquals v1="${ledg.transactionID}" v2="${param['trns']}"/>
</c:set>

It also expects String type.