Spring 中 No serializer found for class問題

HTTP Status 500 - Could not write content: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain

緣由：hibernate添加了一些字段(使變成Json時報錯)

解決方案一: 字段上加註解 

@JsonIgnoreProperties(value={"hibernateLazyInitializer","handler","fieldHandler"})

解決方案二：本身配置(拷備過來用便可)

1. 新建一個CustomMapper 類

public class CustomMapper extends ObjectMapper {
    public CustomMapper() {
        this.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        // 設置 SerializationFeature.FAIL_ON_EMPTY_BEANS 爲 false
        this.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
    }
}

2.在applicationContext-mvc.xml配置

<!-- Spring MVC 配置 -->
<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="supportedMediaTypes">
                <list>
                    <value>application/json; charset=UTF-8</value>
                    <value>application/x-www-form-urlencoded; charset=UTF-8</value>
                </list>
            </property>
            <!-- No serializer:配置 objectMapper 爲咱們自定義擴展後的 CustomMapper,解決了返回對象有關係對象的報錯問題 -->
            <property name="objectMapper">
                 <--本身類的全限定名-->
                <bean class="com.yilin.aisell.common.CustomMapper"></bean>
            </property>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>