Resteasy is not able to load the proxy interface, ERROR: java.lang.IllegalArgumentException: interface RESTServiceInterface is not visible from class loader

Issue

• The Resteasy client fails to build a dynamic proxy using an annotated interface and throws the below ERROR and traces:

  12:38:36,269 ERROR [:] [xx.xx.xx.xx] (default task-1) java.lang.IllegalArgumentException: interface xx.xx.xx.RESTServiceInterface is not visible from class loader: java.lang.IllegalArgumentException: interface xx.xx.xx.RESTServiceInterface is not visible from class loader
  at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:581) [rt.jar:1.8.0_162]
  at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:557) [rt.jar:1.8.0_162]
  at java.lang.reflect.WeakCache$Factory.get(WeakCache.java:230) [rt.jar:1.8.0_162]
  at java.lang.reflect.WeakCache.get(WeakCache.java:127) [rt.jar:1.8.0_162]
  at java.lang.reflect.Proxy.getProxyClass0(Proxy.java:419) [rt.jar:1.8.0_162]
  at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:719) [rt.jar:1.8.0_162]
  at org.jboss.resteasy.client.jaxrs.ProxyBuilder.proxy(ProxyBuilder.java:85) [resteasy-client-3.6.1.SP2-redhat-00001.jar:3.6.1.SP2-redhat-00001]
  at org.jboss.resteasy.client.jaxrs.ProxyBuilder.build(ProxyBuilder.java:152) [resteasy-client-3.6.1.SP2-redhat-00001.jar:3.6.1.SP2-redhat-00001]
  at org.jboss.resteasy.client.jaxrs.internal.ClientWebTarget.proxy(ClientWebTarget.java:93) [resteasy-client-3.6.1.SP2-redhat-00001.jar:3.6.1.SP2-redhat-00001]
  ...