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If care is not taken with the quoting of literals, the expression language (OGNL) will misinterpret a char as a String.

<s:if test="aStringProperty == 'A'">
  Why doesn't this work when myString is equal to A?
</s:if>

The solution is simple: flip the double and single quotes.

<s:if test='aStringProperty == "A"'>
  This works!
</s:if>

Another solution is to escape the double quotes in the String.

<s:if test="aStringProperty == \"A\"">
  This works too!
</s:if>