FULL PRODUCT VERSION :
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
If a class assumes an implicit default constructor, creating a newInstance of an object throws a NoSuchMethodException shown below. If a default constructor is provided explicitly, everything works fine.

 Exception in thread "main" java.lang.NoSuchMethodException: B.<init>()
        at java.base/java.lang.Class.getConstructor0(Class.java:3322)
        at java.base/java.lang.Class.getConstructor(Class.java:2108)
        at NewInstanceBug.main(NewInstanceBug.java:29)


REGRESSION. Last worked in version 8u144

ADDITIONAL REGRESSION INFORMATION:
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Cut and paste the provided code in a file called NewInstanceBug.java
Compile it: javac NewInstanceBug.java
Run it: java NewInstanceBug

To correct the problem, uncomment the default constructor in class B and recompile and run. This is the simplistic case.

An interface is also provided. A similar test can be constructed showing this case also fails when assuming an implicit constructor.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Output:

z2.name(): B
z2: B


ACTUAL -
Exception in thread "main" java.lang.NoSuchMethodException: B.<init>()
        at java.base/java.lang.Class.getConstructor0(Class.java:3322)
        at java.base/java.lang.Class.getConstructor(Class.java:2108)
        at NewInstanceBug.main(NewInstanceBug.java:30)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

interface A {

    String name();

}

//class B implements A {
class B {

/*
    public B() {
    }
*/

    public String name() {
        return getClass().getName();
    }

    public String toString() {
        return name();
    }

}

public class NewInstanceBug {

    public static void main(String[] args) throws Exception {
        //A z1 = Class.forName("B").asSubclass(A.class).getConstructor().newInstance();
        B z2 = Class.forName("B").asSubclass(B.class).getConstructor().newInstance();

        //System.err.println("z1.name(): "+z1.name());
        //System.err.println("z1: "+z1);
        System.err.println("z2.name(): "+z2.name());
        System.err.println("z2: "+z2);
    }

}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Workaround would be to include a default constructor which is what is trying to be avoided.