请教个Mongodb+Springmvc,查询报错

2019-07-22 03:08:48 242 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

MongoDB SpringMVC整合mongodb 3.0驱动的异常解决 MongoDB SpringMVC整合mongodb 3.0驱动的异常解决阅读详情

实体类：Student、WeightAddition、Weight，它们关系如下



public class Student {

@Id

private String code;

private String name;

private WeightAddition weightAddition;

public Student() {

	//this.user = new User(1, "3434", SexEnum.MAN,  new Weight(0, WeightUnit.KG));

	this.weightAddition = new WeightAddition(new WeightAddition.Weight(0, WeightUnit.KG));

}



public class WeightAddition

{

    /// 最大加成重量

	private double maxAdditionWeight ;

    /// 最大加成重量单位

	private WeightUnit maxAdditionWeightUnit ;

    public WeightAddition(Weight maxAdditionWeight)

    {

         this.maxAdditionWeight = maxAdditionWeight.value;

         this.maxAdditionWeightUnit = maxAdditionWeight.weightUnit;

    }

	  public static class Weight {

       private double value;



    	private  WeightUnit weightUnit;

    	public Weight(double value, WeightUnit weightUnit) {

    		this.value = value;

    		this.weightUnit = weightUnit;

    	}

    }

当查询数据后不知道（List<Student> studentList=mongo.findAll();），会报错呢

报错信息如：
14:43:54,166 INFO ClassPathXmlApplicationContext:583 - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@50675690: startup date [Mon Jul 22 14:43:54 CST 2019]; root of context hierarchy
14:43:54,267 INFO XmlBeanDefinitionReader:317 - Loading XML bean definitions from class path resource [spring-context.xml]
Exception in thread "main" org.springframework.data.mapping.model.MappingInstantiationException: Failed to instantiate com.prc.domain.WeightAddition using constructor public com.prc.domain.WeightAddition(com.prc.domain.WeightAdditionPackagesType,double,com.prc.domain.WeightAddition$Weight) with arguments AllPackage,0.0,0.0
at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:78)
at org.springframework.data.convert.ClassGeneratingEntityInstantiator.createInstance(ClassGeneratingEntityInstantiator.java:83)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:251)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:231)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1186)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$200(MappingMongoConverter.java:78)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1134)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValueInternal(MappingMongoConverter.java:870)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:283)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:271)
at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:309)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:271)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:231)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:191)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:187)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:78)
at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:2230)
at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1906)
at org.springframework.data.mongodb.core.MongoTemplate.findAll(MongoTemplate.java:1312)
at org.springframework.data.mongodb.core.MongoTemplate.findAll(MongoTemplate.java:1308)
at com.prc.daoImpl.StudentImpl.findAll(StudentImpl.java:82)
at com.prc.test.TestMongo.main(TestMongo.java:53)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.prc.domain.WeightAddition]: Illegal arguments for constructor; nested exception is java.lang.IllegalArgumentException: argument type mismatch
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:151)
at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:76)
... 21 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142)

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