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https://issues.apache.org/jira/browse/JEXL-307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16963775#comment-16963775
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Dmitri Blinov commented on JEXL-307:
------------------------------------
The following test case fails with NPE on the second parsing
{code}
package org.apache.commons.jexl3;
import java.util.Set;
import org.junit.Assert;
import org.junit.Test;
/**
* Test cases for lexical option and feature.
*/
public class LexicalTest extends JexlTestCase {
public LexicalTest() {
super("LexicalTest");
}
@Test
public void testLexical3() throws Exception {
JexlScript e = JEXL.createScript("var s = {}; for (var i : [1])
s.add(i); s");
JexlContext jc = new MapContext();
Object o = e.execute(jc);
Assert.assertEquals(Boolean.TRUE, ((Set)o).contains(1));
e = JEXL.createScript("var s = {}; for (var i : [1]) s.add(i); s");
o = e.execute(jc);
Assert.assertEquals(Boolean.TRUE, ((Set)o).contains(1));
}
{code}
> Variable redeclaration option
> -----------------------------
>
> Key: JEXL-307
> URL: https://issues.apache.org/jira/browse/JEXL-307
> Project: Commons JEXL
> Issue Type: New Feature
> Affects Versions: 3.1
> Reporter: Dmitri Blinov
> Assignee: Henri Biestro
> Priority: Minor
> Fix For: 3.2
>
>
> As of now, JEXL allows a script writer to redeclare a local variable during
> script evaluation.
> {code:java}
> var a = 1; var a = 2;{code}
> This may lead to potential errors with misspelled names and clashed
> variables. Checking for already defined variable is a common feature of many
> languages. This feature can be implemented in JEXL as an additional option of
> JexlFeatures class, enabled by default, thus allowing compatibility with
> existing code.
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