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Posted to issues@commons.apache.org by "Duncan Jones (JIRA)" <ji...@apache.org> on 2016/12/12 14:29:58 UTC
[jira] [Updated] (LANG-1295) ArrayUtils.toArray(T... items) has
unsafe use of varargs
[ https://issues.apache.org/jira/browse/LANG-1295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Duncan Jones updated LANG-1295:
-------------------------------
Summary: ArrayUtils.toArray(T... items) has unsafe use of varargs (was: ArrayUtils has unsafe use of varargs, which are marked as safe)
> ArrayUtils.toArray(T... items) has unsafe use of varargs
> --------------------------------------------------------
>
> Key: LANG-1295
> URL: https://issues.apache.org/jira/browse/LANG-1295
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.*
> Affects Versions: 3.5
> Reporter: Duncan Jones
> Priority: Critical
>
> {{ArrayUtils.toArray(T... items)}} is marked as {{@SafeVarargs}}, but I suspect the use of the varargs is unsafe.
> An example, drawn heavily from [this StackOverflow answer|http://stackoverflow.com/a/14252221/474189], demonstrates this:
> {code:java}
> static <T> T[] arrayOfTwo(T a, T b) {
> return ArrayUtils.toArray(a, b);
> }
> @Test
> public void testBadVarArgs() throws Exception {
> @SuppressWarnings("unused") // Need to assign to trigger exception
> String[] result = arrayOfTwo("foo", "bar");
> }
> {code}
> the above code throws an exception: {{java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.String;}}.
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