NullValueInNestedPathException: Invalid property ‘xxx‘ of bean class解决办法

本文探讨了SpringBoot项目中实体类构造函数引发的NullValueInNestedPathException错误,并通过具体的Category和Goods实体类示例,介绍了如何解决因缺少默认构造函数导致的问题。

Springboot 报错信息 NullValueInNestedPathException: Invalid property 'xxx' of bean class

 


public class Goods {
    private Integer goodsId;
    private String goodsName;
    private Double price;
    private String address;
    @DateTimeFormat(pattern = "yyy-MM-dd")
    private Date produceDate;
    private String picture;

    //定义商品对应的分类对象
    private Category category;

 

 

public class Category {
    private Integer categroyId;
    private String categoryName;

    public Category() {
    }

Goods 实体类没有报错 反而Category报错了  问题在于没有默认的构造函数 而 手动创建了函参 的构造函数。

解决办法 1。删除所有的构造函数。2 添加无参构造函数 

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'httpInvokerConfig': Unsatisfied dependency expressed through field 'appMerchantService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'appMerchantDec' defined in ServletContext resource [/WEB-INF/tpaic-auto-net-servlet.xml]: Cannot resolve reference to bean 'dispatchService' while setting bean property 'dispatch'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dispatchService' defined in ServletContext resource [/WEB-INF/tpaic-auto-net-servlet.xml]: Invocation of init method failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.tpaic.nonmotor.biz' defined in class path resource [com/tpaic/nonmotor/biz/beanRefContext.xml]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.context.support.ClassPathXmlApplicationContext]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'brandAutoTypeService' defined in class path resource [com/tpaic/nonmotor/biz/brand-service-context.xml]: Cannot resolve reference to bean 'contractBoSupport' while setting bean property 'contractBoSupport'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'contractBoSupport' defined in class path resource [com/tpaic/nonmotor/biz/service-bo.xml]: Cannot resolve reference to bean 'inquireDetailService' while setting bean property 'inquireDetailService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'inquireDetailService' defined in class path resource [com/tpaic/nonmotor/biz/service-context-part.xml]: Cannot resolve reference to bean 'inquireDetailBoService' while setting bean property 'inquireDetailBoService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'inquireDetailBoService' defined in class path resource [com/tpaic/nonmotor/biz/service-bo.xml]: Cannot resolve reference to bean 'applyPolicyBo' while setting bean property 'applyPolicyBo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'applyPolicyBo' defined in class path resource [com/tpaic/nonmotor/biz/service-bo.xml]: Cannot resolve reference to bean 'commonParameterSupport' while setting bean property 'common'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'commonParameterSupport' defined in class path resource [com/tpaic/nonmotor/biz/service-context-part.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'aggregatedSearchService' of bean class [com.tpaic.nonmotor.biz.util.CommonParameterSupport]: Bean property 'aggregatedSearchService' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
06-11
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