Org. Springframework. Beans. Factory. UnsatisfiedDependencyException: Error creating bean with the name 'couponActivityController: Unsatisfied dependency expressed through the field' couponActivityProvider '; Nested exception is org. Springframework. Beans. Factory. BeanCreationException: Error creating bean with the name 'com. Wanmi. SBC. Marketing. API. The provider. The coupon. CouponActivityProvider' : the Post - processing of FactoryBean 's singleton object failed; Nested exception is Java. Lang. LinkageError: loader constraint violation in interface itable initialization: when resolving method "com. Sun. Proxy. $Proxy175. Add (Lcom/wanmi/SBC/marketing/API/request/coupon/CouponActivityAddRequest;) Lcom/wanmi/SBC/common/base/BaseResponse;" (the instance of the class loader org/springframework/boot/devtools/restart/this/RestartClassLoader) of the current class, com/sun/proxy/$Proxy175, and the class loader (the instance of sun/misc/Launcher $AppClassLoader) for interface com/wanmi/SBC/marketing/API/provider/coupon/CouponActivityProvider have marketers class objects for type com/wanmi/SBC/common/base/BaseResponse informs in the signature