Incorrect way to set the GROUP value.

[una-tapa]

Incorrect:
credentials.put(AttributeNameConstants.WSCREDENTIAL_GROUPS, (List)java.util.Arrays.asList(new String[] {"group1","group2"}));

Correct way to create the group list is:
List list = new ArrayList<>(List.of("a", "b", "c"));"

Thanks to Benjamin Xue (Benjamin.Xue@ibm.com) for finding and testing this.