NoSuchMethodError: javassist.util.proxy.RuntimeSupport.find2Methods deploying Hibernate app in EAP 6

Issue

Encountering the following error when deploying a Hibernate application in EAP

00:20:48,416 ERROR [org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer] (ServerService Thread Pool -- 58) HHH000142: Javassist Enhancement failed: org.myco.MyClass:
java.lang.NoSuchMethodError: javassist.util.proxy.RuntimeSupport.find2Methods(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/reflect/Method;)V
        at org.myco.MyClass_$$_jvst211_0.<clinit>(MyClass_$$_jvst211_0.java)
        ...
        at javassist.util.proxy.ProxyFactory.setField(ProxyFactory.java:525) [javassist-3.12.1.GA.jar:3.12.0.GA]
        at javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:508) [javassist-3.12.1.GA.jar:3.12.0.GA]
        at javassist.util.proxy.ProxyFactory.createClass2(ProxyFactory.java:492) [javassist-3.12.1.GA.jar:3.12.0.GA]
        at javassist.util.proxy.ProxyFactory.createClass1(ProxyFactory.java:428) [javassist-3.12.1.GA.jar:3.12.0.GA]
        at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:400) [javassist-3.12.1.GA.jar:3.12.0.GA]
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:163)
        ...
        at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:389)
        at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1799)
        at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1870)
        ...