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https://issues.apache.org/jira/browse/VELOCITY-986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17986414#comment-17986414
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Patrick Barry commented on VELOCITY-986:
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[~nbubna] this is a breaking change for us that prevents us from upgrading. Is
this just the expected consequence VELOCITY-952 ?
> Breaking change- Map size method is called, instead of provided size property
> -----------------------------------------------------------------------------
>
> Key: VELOCITY-986
> URL: https://issues.apache.org/jira/browse/VELOCITY-986
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 2.4, 2.4.1
> Reporter: Patrick Barry
> Priority: Major
>
> We recently tried to upgrade to 2.4 and 2.4.1 and both had this issue, so we
> had to rollback. We have a template looking like this:
> {code:java}
> https://my.example.com?size=${input.size}{code}
>
> In our VelocityContext, we have have an InnerContext values that should be
> used.
> IE
> {"size"= "1089", "name"="tyler", "age"="28"}
>
> In versions 2.3 and below, this would evaluate to
> [https://my.example.com?size=1089|https://my.example.com/?size=1089]
> With newest versions, it gives us the number of items in our map. So
> [https://my.example.com?size=3|https://my.example.com/?size=1089]
>
> Here is a unit test of our usage. It uses 2 Velocity Contexts
>
> {code:java}
> import org.apache.commons.collections4.map.CaseInsensitiveMap;
> import org.apache.velocity.VelocityContext;
> import org.apache.velocity.app.Velocity;
> import org.apache.velocity.app.VelocityEngine;
> import org.junit.Test;
> import java.io.StringWriter;
> import static org.junit.jupiter.api.Assertions.assertEquals;
> public class VelocityRegressionTest {
> @Test
> public void testVelocityTemplate() {
> VelocityEngine velocityEngine = new VelocityEngine();
> velocityEngine.init();
> CaseInsensitiveMap<String, Object> innerMap = new
> CaseInsensitiveMap<>();
> //Size is both an operation on "Map", as well a key within it
> innerMap.put("size", "1098");
> innerMap.put("name", "Tyler");
> innerMap.put("try", "1");
> CaseInsensitiveMap<String, Object> outerMap = new
> CaseInsensitiveMap<>();
> outerMap.put("input", innerMap);
>
> VelocityContext context = new VelocityContext(outerMap);
> StringWriter sw = new StringWriter();
> //This works correctly
> String template = "https://my.example.com?size=${input.name}";;
> Velocity.evaluate(context, sw, "", template);
> assertEquals("https://my.example.com?size=Tyler";, sw.toString());
> sw = new StringWriter();
> // This notation works, however it is not the one we used. Just
> including it here to show that one notation still works as expected.
> template = "https://my.example.com?size=${input[\"size\"]}";;
> Velocity.evaluate(context, sw, "", template);
> assertEquals("https://my.example.com?size=1098";, sw.toString());
> //THIS DEMONSTRATES THE BREAKING CHANGE
> sw = new StringWriter();
> // In versions 2.4+, size evaluates to the size function of maps, not
> the field inside the map with the same name. This is what broke.
> // Seems like order of operations is flipped
> template = "https://my.example.com?size=${input.size}";;
> Velocity.evaluate(context, sw, "", template);
> assertEquals("https://my.example.com?size=1098";, sw.toString());
> }
> }{code}
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