undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/langtools/tools/javac/defaultMethods/Neg04.java

@@ -0,0 +1,14 @@
+/* @test /nodynamiccopyright/
+ * @bug 7192246
+ * @summary check that default method must have most specific return type
+ * @compile/fail/ref=Neg04.out -XDrawDiagnostics Neg04.java
+ */
+
+class Neg04 {
+    interface IA1 { Integer m(); }
+    interface IA2 extends IA1 { default Number m() { return Neg04.m(this); } } //error
+
+    abstract class C implements IA1, IA2 {}
+
+    static int m(IA2 a) { return 0; }
+}