java8 lambdas and exceptions

Compile.java

import java.util.function.Function;
import java.util.Optional;

public class Compile {

    private <F,T> T runFun(Function<Optional<F>, T> fun, Optional<F> opt) {
        return fun.apply(opt) ;
    }
    public void foo() {
        Function<Optional<String>, String> fun = o -> o.orElseThrow(() -> new RuntimeException("nah"));
        runFun(fun, Optional.of("foo"));
    }
}

NoCompile.java

import java.util.function.Function;
import java.util.Optional;

public class NoCompile {

    private <F,T> T runFun(Function<Optional<F>, T> fun, Optional<F> opt) {
       return fun.apply(opt) ;
    }
    public void foo() {
            runFun(o -> o.orElseThrow(() -> new RuntimeException("nah")), Optional.of("foo"));
    }
}

running it

java -version

 |java version "1.8.0_11"
 |Java(TM) SE Runtime Environment (build 1.8.0_11-b12)
 |Java HotSpot(TM) 64-Bit Server VM (build 25.11-b03, mixed mode)

javac Compile.java

javac NoCompile.java

 |NoCompile.java:10: error: unreported exception X; must be caught or declared to be thrown
 |            runFun(o -> o.orElseThrow(() -> new RuntimeException("nah")), Optional.of("foo"));
 |                                     ^
 |  where X,T are type-variables:
 |    X extends Throwable declared in method <X>orElseThrow(Supplier<? extends X>)
 |    T extends Object declared in class Optional
 |1 error

This was a type inference bug, It was partially resolved in 1.8.0_92 release. please update your JDK.