As reported here:

http://mail.openjdk.java.net/pipermail/core-libs-dev/2019-January/057749.html

when a default method is present in a super interface, the information GetClassMethods returns for the sub-interface or implementing class, incorrectly includes an inherited method (not the default method itself!).

This can be seen with a simple modification to an existing test:

TEST: vmTestbase/nsk/jvmti/GetClassMethods/getclmthd007/TestDescription.java

diff -r 3da307766fb1 test/hotspot/jtreg/vmTestbase/nsk/jvmti/GetClassMethods/getclmthd007.java
--- a/test/hotspot/jtreg/vmTestbase/nsk/jvmti/GetClassMethods/getclmthd007.java
+++ b/test/hotspot/jtreg/vmTestbase/nsk/jvmti/GetClassMethods/getclmthd007.java
@@ -109,7 +110,11 @@
     }
 }

-interface OuterInterface1 {
+interface DefaultInterface {
+ default void default_method() { } // should never be seen
+}
+
+interface OuterInterface1 extends DefaultInterface {
     int meth_i1();
 }


STDOUT:
(7) wrong number of methods: 2, expected: 1
>>> OuterInterface2:
>>> [0]: meth_i1()I <= INHERITED from OuterInterface1
>>> [1]: meth_i2()I
(8) wrong number of methods: 3, expected: 2
>>> OuterClass4:
>>> [0]: <init>()V
>>> [1]: meth_i1()I <= INHERITED from OuterInterface1
>>> [2]: meth_i2()I