Duplicate :
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Compiler crashes with java.lang.NullPointerException. @FunctionalInterface interface Baz extends Foo<Integer, Integer> {} interface Foo<T, N extends Number> { void m(T arg); void m(N arg); } Works fine without @FunctionalInterface. JCK test that fails: lang/LMBD/lmbd045/lmbd04501md/lmbd04501md.html
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