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    <p>This is by design and a known area of incompatibility between Java 6 and Java 7 because the overload-resolution algorithm was fixed in Java 7. In Java 5 and 6, the following code would not compile:</p> <pre><code>class Test { void foo(int... i) {} void foo(double... d) {} void test() { foo(1,2,3); } } </code></pre> <p>The compiler would complain that the calls were ambiguous. But this isn't true because <code>double</code> is more general than <code>int</code> and therefore <code>int</code> is the most-specific option in this case.</p> <p>However this fix resulted in an incompatibility (look at the <a href="http://www.oracle.com/technetwork/java/javase/compatibility-417013.html#jdk7" rel="nofollow">release notes</a>; search for "varargs"). The upshot is that you cannot choose the most-specific method when you have <code>int</code> and <code>Object</code> because neither is a subtype of the other. So this shouldn't compile. However, you can use <code>Integer</code>, because <code>Integer</code> is a subtype of <code>Object</code> and in this case it is the most-specific option and so the compiler can choose that.</p> <p>Pertinent section from the release notes:</p> <blockquote> <p>While the <code>javac</code> compiler accepts more code than it did prior to JDK 7, this fix also results in a slight source incompatibility in the following case:</p> </blockquote> <pre><code>class Test { void foo(int... i) {} void foo(Object... o) {} void test() { foo(1,2,3); } } </code></pre> <blockquote> <p>This code compiles in JDK 6 (the most specific method is <code>foo(int...)</code>). This code does not compile under JDK 7. As per <a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.12.2.5" rel="nofollow">15.12.2.5</a>, it is not possible to choose between <code>foo(int...)</code> and <code>foo(Object...)</code> as neither <code>int</code> is a subtype of <code>Object</code>, nor <code>Object</code> is a subtype of <code>int</code>. This program should be disallowed (in fact, it should never have been allowed in the first place).</p> <p>Nature of Incompatibility: behavioral and source</p> <p>RFE: <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6199075" rel="nofollow">6199075</a></p> </blockquote>
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