I am a little confused over when an attribute value of ${whatever} is evaluated as an
expression and when it is treated literally.
In particular, I am noticing an inconsistency in the way an attribute value is being
treated by <j:set> and <j:if>. It seems that <j:set>'s value attribute is treated
literally; however, the <j:if>'s test attribute is evaluated as an expression.
Consider the following property settings
foo-bar.baz = bing
foo_bar.baz = bing
foo.bar.baz = bing
Here are some usages:
Example 1:
<j:set var="fbb" value="${foo-bar.baz}"/>
<echo message="fbb = ${fbb}"/>
<j:if test="${foo-bar.baz == null}">
<echo message="foo-bar.baz is null"/>
</j:if>
This outputs
fbb is 0
-----------------------------------------------------
Example 2:
<j:set var="fbb" value="${foo_bar.baz}"/>
<echo message="fbb = ${fbb}"/>
<j:if test="${foo_bar.baz == null}">
<echo message="foo_bar.baz is null"/>
</j:if>
This outputs
fbb is bing
foo_bar.baz is null
-----------------------------------------------------
Example 3:
<j:set var="fbb" value="${foo.bar.baz}"/>
<echo message="fbb = ${fbb}"/>
<j:if test="${foo.bar.baz == null}">
<echo message="foo.bar.baz is null"/>
</j:if>
This outputs
fbb is bing
foo.bar.baz is null
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