Mule ExpressionRuntimeException Message payload is of type: LinkedList
问题 error message: Message : Execution of the expression "payload.get(0).get('ACCESS_TOKEN')" failed. (org.mule.api.expression.ExpressionRuntimeException). Message payload is of type: LinkedList Code : MULE_ERROR--2 -------------------------------------------------------------------------------- Exception stack is: 1. Index: 0, Size: 0 (java.lang.IndexOutOfBoundsException) java.util.LinkedList:553 (null) 2. null (java.lang.reflect.InvocationTargetException) sun.reflect.GeneratedMethodAccessor323: