Code no longer works with AM 7.3

[echoloco]

We deployed this node in 7.1.1 but when we upgraded to 7.3 it stopped working. The culprit:

Caused by: java.lang.NoSuchMethodError: 'com.sun.identity.idm.AMIdentity org.forgerock.openam.core.CoreWrapper.getIdentity(java.lang.String, java.lang.String)'
	at org.forgerock.openam.auth.nodes.GetProfilePropertyNode.process(GetProfilePropertyNode.java:89)

CoreWrapper does not seem to have a getIdentity() method anymore.