RELEASE NOTES: JDK 8u20

com.sun.jdi.InterfaceType.invokeMethod() is missing

The JDI API is missing the ability to invoke interface default methods. Interface default methods are a new feature in JDK8.

Support the "s" (second) unit for kdc_timeout in krb5.conf

An interoperability issue is found between Java and the native Kerberos implementation on BSD (including macOS) on the kdc_timeout setting in krb5.conf, where Java interpreted it as milliseconds and BSD as seconds when no unit is specified. This code change adds support for the "s" (second) unit. Therefore if the timeout is 5 seconds, Java accepts both "5000" and "5s". Customers concerned about interoperability between Java and BSD should use "5s".

implement eager resolution of return types

The compiler specification, see JLS8 18.5.2, modified the treatment of nested generic method invocations for which the return type is an inference variable. The compiler has been adapted to implement the new logic. This is important to minimize incompatibility with the javac 7 inference algorithm. Three cases are considered: - The return type needs to be captured - The return type needs to have unchecked conversion - The return type needs to be unboxed

The compiler update implies an eager resolution for generic method invocations, provided that the return type is an inference variable.

Default methods affect the result of Class.getMethod and Class.getMethods

The javadoc for the Class.getMethod and Class.getMethods refer to the definition of inheritance in the Java Language Specification. Java SE 8 changed these rules in order to support default methods and reduce the number of redundant methods inherited from superinterfaces (see JLS 8, 8.4.8).

Class.getMethod and Class.getMethods were not updated with the 8 release to match the new inheritance definition (both may return non-inherited superinterface methods). Typically, the distinction is of no consequence; and for compatibility, it is preferred that the identity and number of returned methods match Java SE 7 as closely as possible. However, when the overriding method is a default method, it is important to filter out other overridden methods. As of 8u20, the implementation has been changed to perform this filtering step when the overrider is a default method.