Please review JDK-8074661 at <http://cr.openjdk.java.net/~attila/8074661/webrev.00> for <https://bugs.openjdk.java.net/browse/JDK-8074661> This change adds the AbstractJSObject.getDefaultValue() method to jdk9 codebase so that it's compatible with the jdk8u backport of JDK-8072426 (which had to introduce it). Thanks, Attila.