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https://issues.apache.org/jira/browse/JEXL-307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16961774#comment-16961774
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Dmitri Blinov commented on JEXL-307:
------------------------------------
The following test case fails in lexical mode.
{code:java}
@Test
public void testLexical2() throws Exception {
JexlEngine jexl = new JexlBuilder().strict(true).create();
JexlEvalContext ctxt = new JexlEvalContext();
JexlOptions options = ctxt.getEngineOptions();
// ensure errors will throw
options.setLexical(true);
JexlScript script = jexl.createScript("{var x = 42}; {var x; return x;
}");
try {
Object result = script.execute(ctxt);
Assert.assertNull(result);
} catch (JexlException xany) {
String ww = xany.toString();
}
}
{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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