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java.lang.UnsupportedOperationException: null	at java.util.AbstractList.add(	at java.util.AbstractList.add(	at java.util.AbstractCollection.addAll(	at	at	at	at	at	at	at$ZuulRefreshListener.onApplicationEvent(	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(	at	at	at	at	at	at	at	at	at	at	at	at