Patch to improve error message for failing to instantiate constructor for abstract class

ReflectionFactory.patch

diff --git a/jdk/internal/reflect/ReflectionFactory.java b/jdk/internal/reflect/ReflectionFactory.java
--- a/jdk/internal/reflect/ReflectionFactory.java
+++ b/jdk/internal/reflect/ReflectionFactory.java
@@ -225,7 +225,8 @@

        Class<?> declaringClass = c.getDeclaringClass();
        if (Modifier.isAbstract(declaringClass.getModifiers())) {
-           return new InstantiationExceptionConstructorAccessorImpl(null);
+           return new InstantiationExceptionConstructorAccessorImpl
+               ("Can not instantiate abstract class");
        }
        if (declaringClass == Class.class) {
            return new InstantiationExceptionConstructorAccessorImpl