nested exception is java.lang.IllegalStateException: refreshAfterWrite requires

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cache' defined in class path resource [com/copyfuture/web/copyfutureweb/configurer/CacheConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.github.benmanes.caffeine.cache.Cache]: Factory method 'cache' threw exception; nested exception is java.lang.IllegalStateException: refreshAfterWrite requires a LoadingCache
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:607)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1305)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1144)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:127)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
	... 24 more
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.github.benmanes.caffeine.cache.Cache]: Factory method 'cache' threw exception; nested exception is java.lang.IllegalStateException: refreshAfterWrite requires a LoadingCache
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622)
	... 42 more
Caused by: java.lang.IllegalStateException: refreshAfterWrite requires a LoadingCache
	at com.github.benmanes.caffeine.cache.Caffeine.requireState(Caffeine.java:194)
	at com.github.benmanes.caffeine.cache.Caffeine.requireNonLoadingCache(Caffeine.java:1015)
	at com.github.benmanes.caffeine.cache.Caffeine.build(Caffeine.java:921)
	at com.copyfuture.web.copyfutureweb.configurer.CacheConfig.cache(CacheConfig.java:58)
	at com.copyfuture.web.copyfutureweb.configurer.CacheConfig$$EnhancerBySpringCGLIB$$600e6612.CGLIB$cache$0(<generated>)
	at com.copyfuture.web.copyfutureweb.configurer.CacheConfig$$EnhancerBySpringCGLIB$$600e6612$$FastClassBySpringCGLIB$$ac98c0d2.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
	at com.copyfuture.web.copyfutureweb.configurer.CacheConfig$$EnhancerBySpringCGLIB$$600e6612.cache(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
	... 43 more

Factory method 'cache' threw exception; nested exception is java.lang.IllegalStateException: refreshAfterWrite requires a LoadingCache  

public class CacheConfig {


    /**
     * 相当于在构建LoadingCache对象的时候 build()方法中指定过期之后的加载策略方法
     * 必须要指定这个Bean，refreshAfterWrite=60s属性才生效
     * @return
     */
    @Bean
    public CacheLoader<String, Object> cacheLoader() {
        CacheLoader<String, Object> cacheLoader = new CacheLoader<String, Object>() {
            @Override
            public Object load(String key) throws Exception {
                return null;
            }
            // 重写这个方法将oldValue值返回回去，进而刷新缓存
            @Override
            public Object reload(String key, Object oldValue) throws Exception {
                return oldValue;
            }
        };
        return cacheLoader;
    }

    @Bean
    public Cache<String, Object> cache(CacheLoader<String, Object> cacheLoader) {
        return Caffeine.newBuilder()
                // 创建缓存或者最近一次更新缓存后经过固定的时间间隔，刷新缓存 最后一次写入后经过固定时间过期
                .refreshAfterWrite(3600L, TimeUnit.SECONDS)
                // 初始的缓存空间大小
                .initialCapacity(100)
                // 缓存的最大条数
                .maximumSize(100000)
                //软引用
                .softValues()
                .build(cacheLoader);
    }
}