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/lambda/FunctionalInterfaceAnno.java

@@ -0,0 +1,33 @@
+/*
+ * @test /nodynamiccopyright/
+ * @summary smoke test for functional interface annotation
+ * @compile/fail/ref=FunctionalInterfaceAnno.out -XDrawDiagnostics FunctionalInterfaceAnno.java
+ */
+class FunctionalInterfaceAnno {
+    @FunctionalInterface
+    static class A { } //not an interface
+
+    @FunctionalInterface
+    static abstract class B { } //not an interface
+
+    @FunctionalInterface
+    enum C { } //not an interface
+
+    @FunctionalInterface
+    @interface D { } //not an interface
+
+    @FunctionalInterface
+    interface E { } //no abstracts
+
+    @FunctionalInterface
+    interface F { default void m() { } } //no abstracts
+
+    @FunctionalInterface
+    interface G { String toString(); } //no abstracts
+
+    @FunctionalInterface
+    interface H { void m(); void n(); } //incompatible abstracts
+
+    @FunctionalInterface
+    interface I { void m(); } //ok
+}