This is my checkbox:
I have a String variable <%=msmt
You need to let JSP print the checked
attribute accordingly.
So basically,
<input type="checkbox" name="headC" id="headC" value="Head" <%= ("Head".equals(msmtHead) ? "checked" : "") %>>
Or with EL
<input type="checkbox" name="headC" id="headC" value="Head" ${msmtHead == 'Head' ? 'checked' : ''}>