/**
 * Initializes the REST adapter.
 */
public AbstractRestAdapterClient() {
   ResteasyProviderFactory instance = ResteasyProviderFactory.getInstance();
        List<MessageBodyReader<?>> messageBodyReaders = getMessageBodyReaders();
        for (MessageBodyReader<?> reader : messageBodyReaders) {
            instance.addMessageBodyReader(reader);
        }
        RegisterBuiltin.register(instance);

Caused by: java.util.ConcurrentModificationException
	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) [rt.jar:1.6.0_32]
	at java.util.AbstractList$Itr.next(AbstractList.java:343) [rt.jar:1.6.0_32]
	at org.jboss.resteasy.core.MediaTypeMap.convert(MediaTypeMap.java:301) [resteasy-jaxrs-2.3.4.Final.jar:]
	at org.jboss.resteasy.core.MediaTypeMap.add(MediaTypeMap.java:282) [resteasy-jaxrs-2.3.4.Final.jar:]
	at org.jboss.resteasy.spi.ResteasyProviderFactory.addMessageBodyReader(ResteasyProviderFactory.java:517) [resteasy-jaxrs-2.3.4.Final.jar:]
	at org.jboss.resteasy.spi.ResteasyProviderFactory.addMessageBodyReader(ResteasyProviderFactory.java:494) [resteasy-jaxrs-2.3.4.Final.jar:]
	at org.jboss.resteasy.spi.ResteasyProviderFactory.addMessageBodyReader(ResteasyProviderFactory.java:484) [resteasy-jaxrs-2.3.4.Final.jar:]
	at org.jboss.resteasy.core.ThreadLocalResteasyProviderFactory.addMessageBodyReader(ThreadLocalResteasyProviderFactory.java:303) [resteasy-jaxrs-2.3.4.Final.jar:]