Vincent Bussol created JEXL-431:
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Summary: Parse error with variables declared in a catch clause
Key: JEXL-431
URL: https://issues.apache.org/jira/browse/JEXL-431
Project: Commons JEXL
Issue Type: Bug
Affects Versions: 3.4.0
Reporter: Vincent Bussol
A variable defined in a catch clause cannot be reused in the same block.
The following scripts are not allowed by the parser:
{code:java}
try {
// do stuff
} catch (let error) {
// manage error
}
let error = 'hello error';{code}
Or:
{code:java}
try {
// do stuff
} catch (let error) {
// manage error
}
try {
// do stuff
} catch (let error) {
// manage error
}{code}
Both cases end with a parsing error:
{code:java}
error: variable is already declared {code}
A failing test can look like:
{code:java}
JexlEngine jexl = new JexlBuilder().create();
final String src = "let x = 0; try { x += 19 } catch (let error) { return 169 }
try { x += 23 } catch (let error) { return 169 }";
final JexlScript script = jexl.createScript(src);
assertNotNull(script);
final Object result = script.execute(null);
assertEquals(42, result); {code}
At runtime it works fine.
A try-with-resources is working fine as well:
{code:java}
try (let closeable = open()) {
// IO stuff
}
try (let closeable = open()) {
// IO stuff
}{code}
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