I know this is an issue for Maven and Jelly, specifically
http://issues.apache.org/jira/browse/JELLY-87
I've got a solution that allows JEXL to handle the following:
JexlContext jc = JexlHelper.createContext();
String value = "Stinky Cheese";
jc.getVars().put("maven.bob.food", value);
// ant property maven.bob.food executing the length method
assertExpression(jc, "maven.bob.food.length()", new
Integer(value.length()));
// using empty on maven.bob.food
assertExpression(jc, "empty(maven.bob.food)", Boolean.FALSE);
assertExpression(jc, "size(maven.bob.food)", new
Integer(value.length()));
assertExpression(jc, "maven.bob.food + ' is good'", value + " is good");
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