Answer by Ghasem Sadeghi for Access from Thymeleaf to constants (without spring)

As you know, Thymeleaf uses OGNL to process commands.So, Without Spring and SpEL this can be achieved like this:

<td><input class="form-control" type="text" name="inputValue"        th:maxlength="${@com.example.yourpackagename.Constants@MAX_TESTCASE_VALUE_LENGTH}" /></td>

OGNL documentation