Java Spring Mongotemplate在创建实例时失败

我使用MongoTemplate从MongoDb获取数据。下面是我的POJO代码和从Mongo获取数据的方法。我在API命中时得到异常。这是一个补丁API调用。 这是一个Spring应用程序，而不是Spring引导应用程序 波乔

从Mongo访问数据的方法：

private List<MyClass> getAllValues(Long identity, String title) {
         Query query= new Query();
        memSubscriptionQuery.addCriteria(Criteria.where("identityNumber").is(identityNumber).and("title").is(title));
        return mongoTemplate.find(query, MyClass .class);


    }

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看起来您正在将一个类对象传递给mongo模板，并期望得到一个列表

return mongoTemplate.find(query, MyClass .class);

您可能必须将方法的返回类型更改为MyClass

---

如果需要列表而不是对象，则必须将类对象包装到另一个获取对象列表的类中。

MongoTemplate.find返回OP使用的正确列表。作为例外通知，OP应该创建另一个构造函数来包含所有变量，如@AllArgConstructors。

包装选项是什么？如果我可以返回MyClass对象列表，请您提供代码快照的一点信息。您还可以提供您试图解析的json吗？@M.WaqasPervez我不认为这是一个答案。find返回使用的OP正确的列表。作为例外通知，OP应该创建另一个构造函数来包含所有变量，如@AllArgConstructors。

org.springframework.data.mapping.model.MappingInstantiationException: Failed to instantiate java.util.List using constructor NO_CONSTRUCTOR with arguments
    at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:64)

at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:64)
    at org.springframework.data.convert.ClassGeneratingEntityInstantiator.createInstance(ClassGeneratingEntityInstantiator.java:83)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:258)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:238)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1218)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$200(MappingMongoConverter.java:85)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1166)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValueInternal(MappingMongoConverter.java:877)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:290)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:278)
    at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:330)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:278)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:238)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1218)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$200(MappingMongoConverter.java:85)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1166)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValueInternal(MappingMongoConverter.java:877)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:290)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWithPersistentProperty(MappingMongoConverter.java:278)
    at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:330)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:278)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:238)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:198)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:194)
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:85)
    at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:2313)
    at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1966)
    at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1784)
    at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1767)
    at org.springframework.data.mongodb.core.MongoTemplate.find(MongoTemplate.java:641)
    at org.springframework.data.mongodb.core.MongoTemplate.find(MongoTemplate.java:632)
    at 

return mongoTemplate.find(query, MyClass .class);

private MyClass getAllValues(Long identity, String title)