Spring Expression Language:: Look up in a map for every value in a collection
I've following code:
PHP Code:
@Test
public void testCollection()
{
List<String> l= new ArrayList<String>();
l.add("S1");
l.add("S2");
Map<String, String> m = new HashMap<String, String>();
m.put("S1","M1");
m.put("S2","M2");
StandardEvaluationContext evaluationContext = new StandardEvaluationContext();
evaluationContext.setVariable("l",l);
evaluationContext.setVariable("m",m);
ExpressionParser expressionParser = new SpelExpressionParser();
String expression1 = "#l.![#this]";
// This one prints S1,S2
System.out.println(expressionParser.parseExpression(expression1).getValue(evaluationContext,String.class));
String expression2 = "#l.![#m[#this]]";
// This one prints null, null and I expect M1,M2
System.out.println(expressionParser.parseExpression(expression2).getValue(evaluationContext,String.class));
}
The question is why expression2 is evaluated to null,null and not M1,M2 or generally how do I get a collection of values projected by looking up in a map using collection entries as keys?
